Relevant bibliographies by topics / Ferritic steel. Welding

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Academic literature on the topic 'Ferritic steel. Welding'

Author: Grafiati
Published: 4 June 2021
Last updated: 19 February 2022

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Journal articles on the topic "Ferritic steel. Welding"

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Kazakov, A. A., O. V. Fomina, A. I. Zhitinev, and P. V. Melnikov. "Basic physical and chemical concepts for controlling δ-ferrite content when welding with austenite-ferrite materials." Voprosy Materialovedeniya, no. 4(96) (January 8, 2019): 42–52. http://dx.doi.org/10.22349/1994-6716-2018-96-4-42-52.

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The paper shows the influence of steel chemical composition on δ-ferrite behavior throughout the entire range of temperature considering welding consumables. Materials for joints are manufactured of the 10Kh19N11M4F, currently used for welding high-strength low-alloy steels. This steel prospects for welding high-nitrogen corrosion-resistant steels saving their non-magnetism, including the zone of welded joint, were analyzed on the basis of these studies. Using thermodynamic modeling, critical parameters were found that determine the behavior of δ-ferrite during solidification and subsequent cooling of solid steel. The most important parameters are the depth of the σ-ferritic transformation and the maximum equilibrium temperature of austenitization, which were used to interpret the experimental data obtained during hot physical modeling of welding. The areas of promising compositions of materials for welding of low-alloyed high-strength and high-nitrogen corrosion-resistant steels without hot cracks and providing, if necessary, the non-magnetic seam were found and depicted on a fragment of an improved Scheffler – Speidel diagram.
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Campbell, R. D. "Ferritic Stainless Steel Welding Metallurgy." Key Engineering Materials 69-70 (January 1992): 167–216. http://dx.doi.org/10.4028/www.scientific.net/kem.69-70.167.

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Safari, Mehdi, Hossein Mostaan, and Abdoreza Ghaderi. "Dissimilar resistance spot welding of AISI 304 to AISI 409 stainless steels: mechanical properties and microstructural evolutions." Metallurgical Research & Technology 115, no. 6 (2018): 610. http://dx.doi.org/10.1051/metal/2018057.

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In this work, dissimilar resistance spot welding of austenitic stainless steel sheet (304 grade) and ferritic stainless steel sheet (409 grade) is studied experimentally. For this purpose, the effects of process parameters such as welding current, welding time and electrode force on tensile-shear strength of resistance spot welded joints are investigated with response surface methodology (RSM). Also, microstructural evolutions during resistance spot welding process of AISI 409 and AISI 304 stainless steels are evaluated by optical microscopy. It is concluded from results that the tensile-shear strength of spot welds is increased with increasing the welding current, welding time and electrode force. It is shown that widmanstatten ferrites have been grown in the weld metal of dissimilar resistance spot welds of AISI 304 and AISI 409 stainless steels.
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Varbai, Balázs, Ferenc Tolnai, and Kornél Májlinger. "Effects of TIG Reheating on Duplex Stainless Steel Weld Microstructure." International Journal of Engineering and Management Sciences 4, no. 1 (March 3, 2019): 295–302. http://dx.doi.org/10.21791/ijems.2019.1.37.

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Duplex stainless steels (DSS) gaining their excellent mechanical properties and corrosion resistance due to their austenitic-ferritic microstructure, ideally in the same amount. However, to keep this ideal phase ratio during arc welding is very difficult. Generally, the arc welding processes will result in more ferritic microstructure in the weld metal and in the heat affected zone, due to the rapid cooling. The ferritic microstructure can cause chromiumnitride precipitation, because the nitrogen solubility in ferrite phase is very low below 700 °C. These chromiumnitride precipitations can cause loss of corrosion resistance and mechanical properties. However, during subsequent reheating, the chromium-nitrides can dissolve and act as a secondary austenite nucleation site in the ferritic microstructure. In our research we welded DSS specimen autogenously, with tungsten inert gas welding using pure argon and 94 % argon + 6 % nitrogen as shielding gasses. In the first case the sub-sequent solid-state reheating caused 20 % increase in the austenite fraction of the weld metal but with the use of mixed shielding gas only 5 % increase.
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Akbari Mousavi, Seyed Ali Asghar, and A. Garehdaghi. "Investigations on the Microstructure and the Fracture Surface of Pulsed Nd: YAG Laser Welding of AISI 304 Stainless Steel." Advanced Materials Research 445 (January 2012): 418–23. http://dx.doi.org/10.4028/www.scientific.net/amr.445.418.

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The paper presents pulsed Nd:YAG laser welding of the 304 stainless steels. The welding tests were carried out with various operational parameters. The effects of laser welding variables on the geometry, microstructure and solidification of the weld are considered. The austenitic or ferritic solidification is produced in the 304 austenitic stainless steel depended upon the cooling rate and its chemical compositions. The possiblity of austenitic solidification compared with the ferritic solidification decreases with the chromium to nickel equivalent ratio and that increases with cooling rates. Moreover, more δ ferrite is obtained if the cooling rate is increased or the higher power laser is used. The surface of fracture samples was considered and the reason for failure was investigated. The study shows that the fracture is in ductile type.
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Sundaresan, S. "Metallurgy of Welding Stainless Steels." Advanced Materials Research 794 (September 2013): 274–88. http://dx.doi.org/10.4028/www.scientific.net/amr.794.274.

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Based primarily on microstructure, five stainless steel types are recognized: ferritic, martensitic, austenitic, duplex and precipitation-hardening. The major problem in ferritic stainless steels is the tendency to embrittlement, aggravated by various causes. During welding, control of heat input is essential and, in some cases, also a postweld heat treatment. The austenitic type is the easiest to weld, but two important issues are involved in the welding of these steels: hot cracking and formation of chromium carbide and other secondary phases on thermal exposure. The nature of the problems and remedial measures are discussed from a metallurgical perspective. Duplex stainless steels contain approximately equal proportions of austenite and ferrite. The article discusses the upset in phase balance during welding both in the weld metal and heat-affected zone and the formation of embrittling secondary phases during any thermal treatment. Martensitic stainless steels are susceptible to hydrogen-induced cracking. Welding thus involves many precautions to prevent it through proper preheat selection, postweld heat treatment, etc. In the welding of precipitation-hardening stainless steels, it is usually necessary to develop in the weld metal strength levels matching those of the base metal. This is achieved by applying a postweld heat treatment appropriate to each type of alloy.
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Kuzmikova, Lenka, Huijun Li, John Norrish, Zengxi Pan, and Nathan Larkin. "Development of safe optimized welding procedures for high strength Q&T steel welded with austenitic consumables." Soldagem & Inspeção 18, no. 2 (June 2013): 169–75. http://dx.doi.org/10.1590/s0104-92242013000200010.

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High strength quenched and tempered (Q&T) steels offer obvious economic benefits originating from their advantageous strength to price and weight ratios. These steels are usually welded using ferritic consumables and for this combination the risk of hydrogen assisted cold cracking (HACC) is high. The use of austenitic stainless steel (ASS) consumables has great potential to significantly improve this issue. Yet, there are no guidelines for determination of safe level of preheat for welding ferritic steels with ASS consumables. For this reason manufacturers adopt this parameter from procedures developed for conventional ferritic consumables thus significantly limiting the benefits ASS consumables are capable to deliver. Productivity could be further enhanced by identifying the upper interpass temperature threshold, thus reducing the stand-off times. Aim of this work is to develop safe highly optimised procedures for welding of high strength Q&T steel with ASS consumable.
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Penha, R. N., L. B. Silva, C. S. P. Mendonça, T. C. Moreira, and M. L. N. M. Melo. "Effect of ageing time on microstructure and mechanical properties of SAF 2205 duplex stainless steel." Archives of Materials Science and Engineering 1, no. 91 (May 1, 2018): 23–30. http://dx.doi.org/10.5604/01.3001.0012.1382.

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Purpose: SAF 2205 duplex stainless steels (DSSs) are materials characterized by a favourable combination of the properties of ferritic and austenitic stainless steels. This type of stainless steel presents good weldability, corrosion resistance especially for stress corrosion cracking (SCC). However, this steel presents an unavoidable disadvantage that is its potential microstructural instability. Although duplex stainless steels design idea is to present two main types of microstructure, other phases and carbides or nitrides can precipitate. In the case of DSS SAF 2205, in addition to austenitic and ferritic microstructure, during heat treatment processing, welding or use may occur precipitation of undesirable intermetallic phases such as chi, Widmanstätten austenite, sigma besides carbides and nitrides. The precipitation of s-phase is associated with effects that cause both reduction of toughness and decreases the corrosion resistance on austenitic, ferritic and duplex stainless steels. Design/methodology/approach: This study evaluated the aging treatment effect on hardness, impact toughness and ferrite content of a SAF 2205 duplex stainless steel. Samples were solubilized at 1150°C, quenched in water and aged at 850°C during 1, 5, 10, 30, 60 or 180 minutes. After aging, cooling was to room temperature in air. Findings: Aging time promoted s-phase precipitation and hardness increase. Hardness and ferrite volume measurements, microscopy and the prediction of sigma phase bases the discussion. Impact toughness decreased with time aging and intermetallic phase precipitation. Research limitations/implications: As future work could be performed some corrosion test, vary the cooling rate after aging, and using other techniques to identify phases. Focus the research at lower aging times to try the describe Cr partitioning process to form sigma phase. Practical implications: High aging time should be avoided for SAF 2205 DSS. Originality/value: Usually sigma-phase precipitation on DDS is correlated to welding process. This paper correlates it to aging heat treatment.
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Chowdhury, Sandip Ghosh, B. Mahato, Hezio Rosa da Silva, Gustavo Gonçalves Lourenço, and Dagoberto Brandão Santos. "Evolution of Texture in Ultra-Fine Grained Ferrite through Warm-Rolling and Intercritical Annealing." Materials Science Forum 584-586 (June 2008): 610–16. http://dx.doi.org/10.4028/www.scientific.net/msf.584-586.610.

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The ferrite grain size refining is the unique mechanism for increasing both mechanical strength and formability of steels. Steel with an ultra-fine ferrite grained structure must show a good relation between mechanical strength, ductility and toughness, while the low carbon content enhances good welding characteristics. The objective of this work is to investigate the influence of warm rolling on the evolution of texture in a microalloyed low carbon-manganese (0.11%C, 1.41%Mn, 0.028%Nb and 0.012%Ti) steel with ultra-fine grains produced through out quenching, warm rolling, followed by sub and intercritical annealing. The evolution of restoration process - recovery and recrystallization - was followed by optical and scanning microscopy. After subcritical annealing, the microstructure was formed by spheroidal iron carbides and a ferritic recovered matrix. Otherwise, after intercritical annealing, the microstructure was composed mainly by ultrafine grain polygonal ferrite, MA (martensite-austenite) constituent and carbides. The mechanical behaviour of the steel was evaluated using tensile tests. The mechanical properties have been correlated with the evolution of texture in the ultra-fine grained ferrites.
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Raj Kumar, R., and Surendra Patle. "Development of Heat Treatment Parameters to Enhance HAZ Impact Toughness of SS 430 Material." Advanced Materials Research 794 (September 2013): 214–21. http://dx.doi.org/10.4028/www.scientific.net/amr.794.214.

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Pressure Housing, used in the Grid Mechanisms Motor, is manufactured from ferritic stainless steel, SS430 bar of 120mm diameter. The application demands an alternative non-magnetic and magnetic material (austenitic and ferritic) on the outside. This is manufactured by making longitudinal machined slots on the outside surface of SS430 bar which is ferritic and magnetic and the machined slots are filled up by depositing SS347 which is an austenitic and non-magnetic stainless steel material. In order to weld SS430 # SS430 with SS347, welding procedure was to be qualified as per ASME Sec IX with additional requirements of impact specimens from weld and HAZ at temperature +20°C, microstructure examination and intergranular corrosion test as per ASTM A763 Pr.Z. It was the first time, SS430 # SS430 welding procedure qualification with SS347 was to be carried out as no earlier cases required this qualification. SS430 ferritic stainless steel bar exhibits stringers of ferrite and martensite and in cases of stingers of two phase structures like duplex stainless steel, it has been reported that the transverse impact properties drops to half to two-third the longitudinal values. In the welded coupon, the impact property on the HAZ was located in the transverse direction and extremely difficult to meet the requirements. Welding qualification with impact requirement in transverse direction in HAZ was a challenging task and this paper addresses the issues encountered and the work carried out in literature study on the metallurgy, heat treatment and experimental trials to meet the specification requirement.
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Dissertations / Theses on the topic "Ferritic steel. Welding"

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Greeff, Mary Louise. "The influence of welding parameters on the sensitisation behaviour of 3CR12." Diss., Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-04052007-124929.

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Magowan, Stephen. "Effects of cold metal transfer welding on properties of ferritic stainless steel." Thesis, Sheffield Hallam University, 2017. http://shura.shu.ac.uk/17304/.

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Stainless steels are a classification of materials that have been available for over 100 years and over that time manufacturers have created variations on chemical composition and manufacturing route, to create materials that meet specific criteria set by the consumer. One type of stainless steel, ferritic, is restricted in applications as a result of a reduction in properties, namely toughness, when it is welded as a result of grain coarsening in the heat affected zone. Welding equipment manufacturers are constantly incorporating new technologies and capabilities into welding equipment, to make welding easier and create better welds, which then gives that manufacturer a competitive advantage. Cold Metal Transfer (CMT) welding is one such innovation and is claimed by the manufacturer to be a lower heat input process. This research project examines the effects of this lower heat welding process, on the joining of ferritic stainless steels to determine if CMT can reduce the detrimental effects, seen in this material, through welding. The research examines the mechanical and metallurgical effects of using the Cold Metal Transfer (CMT) welding process to weld various grades of ferritic stainless steel including, EN1.4016, EN1.4509, EN1.4521 and EN1.4003 and compares them to welds created using a standard Gas Metal Arc Welding (GMAW) technique, with comparisons made using tensile testing, hardness testing, impact testing, fatigue testing and microstructural characterisation. Experimental results show that grades such as EN1.4016 and EN1.4003 are more sensitive to the welding process due to a phase change to martensite present within the heat affected zone. Work has been conducted to determine the temperature at which ferrite transforms to austenite, prior to transformation to martensite under non equilibrium cooling. Some of the findings from this work included; Fatigue testing and microstructural characterisation has shown a benefit in properties for using CMT over the conventional GMAW process for the EN1.4003 material. A relationship has also been proposed which examines the effect of the percentage of fusion zone defects on the fatigue life of the welded joints. Overall it was found that there was variation in the voltage and current by 1.9 Volts and 15 Amps respectively through a 400mm weld. The ALC settings from -30% to +30% affected the net heat input by 6J/mm NDT techniques utilised in the study were ineffective at detecting the lack of side wall fusion evident in some of the welds.
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Caetano, Gerbson de Queiroz. "Joining of similar ferritic and austenitic stainless steels by the "friction stir welding" process." Universidade Federal do CearÃ, 2016. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=17229.

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This study aimed to investigate the similar welding of several ferritic and austenitic stainless steels (AISI 304L, AISI 316L, AISI 410S and AISI 444) by the friction stir welding process (FSW), evaluating operational and metallurgical aspects to produce joints without defects. The FSW welding of four materials in this study was performed at the Helmholtz-Zentrum Geesthacht (Germany) due to the establishment of a cooperation agreement with the Universidade Federal do CearÃ. The welding parameters range were based on papers found in literature, for the other kinds of stainless steel, different this study, changes the parameters were changed to determine an acceptable combination of surface finish, absence of cracks and good penetration. The better welding conditions based on surface finish and defects free for each welded steels were subjected to mechanical evaluation through tensile test, bending test and microhardness test. In the same way, for the better welded conditions, samples were extracted to metallographic preparation and evaluated by light microscopy and scanning electron microscopy. The results from microscopy techniques allows the correlation between microstructure with the microhardness profiles, as well as the causes of low mechanical properties for same welds by the identification of defects in the stir zone such, as voids and lack of penetration. The ferritic stainless steels welds showed the best results in mechanical assessment due to grain refinement that occurred in the stir zone and thermomechanical affected zone. The calculation of equivalent heat input showed that for stainless steel AISI 304L and AISI 410S, higher values of heat input determine the highest incidences of chromium carbide precipitation and other possible deleterious phases in the stir zone, however DL-EPR technique and mechanical testing have shown that it is possible to weld the stainless steels by FSW process with excellent corrosion resistance and good mechanical properties.
Este trabalho teve como objetivo, investigar a soldagem similar de diversos aÃos inoxidÃveis ferrÃticos e austenÃticos (AISI 304L, AISI 316L, AISI 410S e AISI 444) pelo processo friction stir welding (FSW), avaliando aspectos operacionais e metalÃrgicos para a produÃÃo de juntas sem defeitos. A soldagem FSW dos quatro materiais em estudo foi realizada no Helmholtz-Zentrum Geesthacht (Alemanha) devido ao estabelecimento de um acordo de cooperaÃÃo com a Universidade Federal do CearÃ. Os parÃmetros de soldagem foram baseados em trabalhos anteriores, para outros tipos de aÃos inoxidÃveis, diferentes deste estudo, e a variaÃÃo realizada na busca de parÃmetros que determinassem uma combinaÃÃo entre acabamento superficial aceitÃvel, ausÃncia de trincas e boa penetraÃÃo. As melhores condiÃÃes soldadas para cada aÃo, com base no acabamento superficial e na ausÃncia de defeitos, foram submetidas a avaliaÃÃo das propriedades mecÃnicas atravÃs dos ensaios de dobramento, microdureza e traÃÃo. Da mesma forma, para as melhores condiÃÃes soldadas, amostras foram extraÃdas para preparaÃÃo metalogrÃfica e avaliadas por microscopia Ãtica e microscopia eletrÃnica de varredura. Os resultados da anÃlise microscÃpica possibilitaram a correlaÃÃo entre microestrutura com os perfis de microdureza, bem como as causas do baixo desempenho mecÃnico para os aÃos inoxidÃveis austenÃticos, com a identificaÃÃo de defeitos na zona de mistura, tais como vazios e falta de penetraÃÃo. Os aÃos inoxidÃveis ferrÃticos apresentaram os melhores resultados na avaliaÃÃo mecÃnica devido ao intenso refino de grÃo que ocorreu na zona de mistura e na zona termomecanicamente afetada. O cÃlculo do aporte tÃrmico equivalente mostrou que para os aÃos inoxidÃveis AISI 304L e AISI 410S, elevados valores de aporte tÃrmico determinam maiores incidÃncias de precipitaÃÃo de carbonetos de cromo e de outras possÃveis fases deletÃrias na zona de mistura, entretanto a tÃcnica EPR-DL e os ensaios mecÃnicos comprovaram que à possÃvel soldar os aÃos inoxidÃveis pelo processo FSW com excelente resistÃncia a corrosÃo e boas propriedades mecÃnicas.
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Ray, Lara L. "Friction stir welding of HT9 ferritic-martensitic steel: an assessment of microstructure and properties." Monterey, California: Naval Postgraduate School, 2013. http://hdl.handle.net/10945/34726.

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This thesis explores the processing-microstructure-property relationships in friction stir welded (FSW) HT9A ferritic-martensitic steel. HT9 has previously been studied as a structural component for fusion/fission based reactors; however, the changes in material microstructure and properties after friction stir welding have not been considered. HT9A steel plate was friction stir welded with a series of increasing heat inputs. The microstructure of this welded material was characterized using optical and electron microscopy. The mechanical properties of the welded material were determined using nanoindentation and microhardness measurements. In addition, electrochemical impedance spectroscopy (EIS) in molten lithium fluoride was used to assess the high temperature corrosion resistance of the welded material in the harsh environments found in fusion reactors. The quality of the friction stir welds was excellent, and the basic ferritic-martensitic microstructure was maintained for all of the conditions used. Some reduction in hardness was observed in the welded material, particularly in the heat affected zones. The high temperature corrosion response of the welded material was comparable to, or slightly better than, the base plate material.
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Barros, Isabel Ferreira de. "Dissimilar welding of ferritic stainless steel AISI 444 and AISI 316L austenitic stainless steel through the autogenous TIG process using pulsed current." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=14072.

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FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgico
The use of stainless steels has intensified with the industrial demand growing, which extends its application for various sectors such as the oil and gas, desalination equipment in industry, sugar industry, among others. In that context, the use of ferritic stainless steels has grown in recent years on account of its excellent relationship between corrosion resistance and cost, and a great option in substitution of austenitic stainless steels. Intending to study the connection of dissimilar stainless steels by means of a welding process, this paper will lay the submit the ferritic stainless steel AISI 444 and AISI 316L austenitic stainless steel with TIG welding autogenous (without filler metal) with pulsed current. That union seeks to get a fused zone with better mechanical properties together with the correction of possible related to welding those steels problems, such as grain growth in ferritic steels, to which its refinement is possible through the use of pulsed current during the procedure. The choice of these two materials was based on the characteristics of each one separately for they possess closest properties, despite having different classifications, allowing the combined use of both, and thus ferritic act in order to partially replace the austenitic stainless steel in situations where the combination of high corrosion resistance and mechanical strength are not relevant. That action combined, and does not affect the characteristics of the set of negative way is to use lower cost benefit, because the presence of nickel austenitic stainless steels by more expensive finishes them. Thus, it is expected to provide, through this work, further deepening the respect of dissimilar welding between stainless steel AISI 444 ferritic and austenitic stainless steel AISI 316L, evaluating operational parameters such as the pulse of current and heat input on obtained microstructure and mechanical properties.
A utilizaÃÃo dos aÃos inoxidÃveis tem se intensificado juntamente com a crescente demanda industrial, em que sua aplicaÃÃo se estende pelos mais variados setores, como por exemplo, na indÃstria de petrÃleo e gÃs, em equipamentos de dessalinizaÃÃo, na indÃstria sucroalcooleira, entre outros. Neste contexto, o uso de aÃos inoxidÃveis ferrÃticos tem crescido nos Ãltimos anos devido a sua excelente relaÃÃo entre resistÃncia à corrosÃo e custo, sendo uma Ãtima opÃÃo em substituiÃÃo aos aÃos inoxidÃveis austenÃticos. Objetivando estudar a uniÃo de aÃos inoxidÃveis dissimilares por meio de um processo de soldagem, o presente trabalho submeterà o aÃo inoxidÃvel ferrÃtico AISI 444 e o aÃo inoxidÃvel austenÃtico AISI 316L à soldagem TIG autÃgeno (sem metal de adiÃÃo) com corrente pulsada. Essa uniÃo visa obter uma zona fundida com melhores propriedades mecÃnicas juntamente com a correÃÃo dos possÃveis problemas relacionado à soldagem desses aÃos, como por exemplo, o crescimento de grÃo nos aÃos inoxidÃveis ferrÃticos, em que seu refinamento se torna possÃvel atravÃs da utilizaÃÃo de corrente pulsada durante o procedimento. A escolha desses dois materiais baseou-se nas caracterÃsticas inerentes a cada um separadamente e tambÃm por possuÃrem propriedades muito prÃximas, apesar de possuÃrem classificaÃÃes diferentes, permitindo a utilizaÃÃo combinada de ambos e dessa forma o aÃo inoxidÃvel ferrÃtico atuarà de forma a substituir parcialmente o aÃo inoxidÃvel austenÃtico nas situaÃÃes em que a combinaÃÃo de elevada resistÃncia à corrosÃo e resistÃncia mecÃnica nÃo sÃo tÃo relevantes. Essa utilizaÃÃo combinada, alÃm de nÃo afetar as caracterÃsticas do conjunto de maneira negativa tem como benefÃcio reduzir custos, visto que a presenÃa de nÃquel nos aÃos inoxidÃveis austenÃticos acaba por encarecÃ-los. Dessa forma, espera-se fornecer atravÃs deste trabalho um maior aprofundamento a respeito da soldagem dissimilar entre o aÃo inoxidÃvel ferrÃtico AISI 444 e o aÃo inoxidÃvel austenÃtico AISI 316L, avaliando os parÃmetros operacionais, como a pulsaÃÃo da corrente e a energia de soldagem sobre a microestrutura obtida, bem como as propriedades mecÃnicas.
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Prins, Heinrich Johann. "The effect of autogenous gas tungsten arc welding parameters on the solidification structure of two ferritic stainless steels." Diss., University of Pretoria, 2019. http://hdl.handle.net/2263/79303.

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Ferritic stainless steel is typically used in the automotive industry to fabricate welded tube that is plastically deformed for flanging, bending and necking. The effect of welding parameters during autogenous gastungsten arc welding (GTAW) of thin sheet on the weld metal structure and tensile properties were determined. Two grades of ferritic stainless steels, a titanium-containing Grade 441 and a titanium-free molybdenum-containing Grade 436, were used as base metal. Statistical analysis was used to determine the influence of welding parameters on the microstructure of autogenous GTAW welds. The results of Grade 441 indicated that the welding speed and peak welding current had a statistically significant influence on the amount of equiaxed grains that formed. For Grade 436, the same welding parameters (welding speed and peak welding current) had a statistically significant influence on the grain size of the weld metal grains. The ductility of a tensile test coupon machined parallel to the weld direction, for both base metal grades, was unaffected by the welding parameters or the weld metal microstructure. The elongation was determined by the amount of weld metal in the gauge area of a tensile coupon. The titanium content of the base material seems to have the most significant effect on the formation of equiaxed grains.
Dissertation (MEng)--University of Pretoria, 2019.
Metallurgical Engineering
MEng
Unrestricted
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Glansholm, Tom. "FE-model for prediction of welding distortions in components made of preformed stainless steel sheets." Thesis, KTH, Hållfasthetslära, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-286144.

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This master thesis was carried out at Scania CV AB. The focus for this thesis is the prediction of welding distortions that can cause problems in the manufacturing process of Scania's after-treatment system. The after-treatment system is mainly assembled by sheet metal plates of the ferritic stainless steel EN 1.4509. The plates are welded together. When welding, distortions and residual stresses occur, and they also depend on the sequence in the component was welded together. The distortions and residual stresses can cause tolerance related issues and a lower lifetime for the welded components. Experiments are expensive and therefore it is desirable to simulate the welding process, thereby controlling distortions and optimizing welding sequences. To simulate the welding process and predict the welding distortions a thermo-mechanical FE-model was created for two typical welds found on the after-treatment system. The first scenario was two thin plates welded onto each other in an overlap weld joint and the second scenario was a thin plate welded onto a thick plate in a overlap weld joint. After the FE-model was compared to the experiments. An optimization of the welding sequences was also made on a larger component typically found on the after-treatment system. The FE-model can predict the distortion shape with good accuracy for the T-fillet weld, while the model predicted a more symmetric distortion shape on the overlap weld compared to a more asymmetric shape found on the experiments, but the error is still not very large. The Fe-model can also be used to optimize the welding sequence for bigger components on the after-treatment system within a reasonable time span compared to doing the opimization manually in an experiment.
Detta examensarbete gjordes för Scania CV AB. Fokus for detta examensarbete har varit kvarvarande deformationer efter svetsning som kan skapa problem vid tillverkningen av Scanias avgasefterbehandlingssystem. Avgasefterbehandlingssystemet är till mesta dels konstruerat av stålplåtar av det ferritiska rostfria stålet EN 1.4509, plåtarna är svetsade ihop och då uppstår kvarvarande deformationer. När komponenter svetsas samman uppstår deformationer och restspänningar. Dessa deformationer och restspänningar är också beroende på i vilken sekvens komponenterna har svetsats ihop. Deformationerna och restspänningarna kan skapa problem med toleranser och sänka livslängden för komponenterna som sammanfogats. Experiment är kostsamma och därför är det önskvärt att simulera svetsprocessen, och därav kontrollera deformationerna som uppstår och optimera i vilken sekvens som komponenterna ska svetsas ihop. För att simulera svetsprocessen och prediktera de kvarvarande deformationerna efter svetsning så gjordes termo-mekanisk FE-model för två vanliga svetsscenarion för avgasefterbehandlingssystemet. Det ena scenariot är två tunna plåtar som svetsas ihop i en överlappande position och det andra var en tunn plåt som svetsas på en tjockare plåt. Ett experiment gjordes sedan för båda svetstyperna. Efter att svetstyperna hade jämförts med experimentet så gjordes en optimering av svetssekvensen för en större komponent likt komponenter funna på avgasefterbehandlingssystemet. Den termomekaniska FE-modelen kunde prediktera de kvarnvarande deformationerna och deras form med bra noggrannhet jämfört med experimentet med undantag för en deformationsform på de tunna plåtarna som var mer symmetrisk i FE-modellen jämfört med den asymmetriska formen i experimentet. FE-modellen kunde också användas för att optimera svetssekvensen för den större komponenten inom en rimlig tidsrymd.
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8

Anttila, S. (Severi). "Influence of minor elements on some weldability issues of intermediate purity stabilized ferritic stainless steels." Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526219738.

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Abstract Stabilized ferritic stainless steel grades are attractive alternatives to common austenitic grades in sheet metal applications. Compared with older unstabilized ferritic grades, the mechanical and corrosion properties are usually improved. The impurity level, mainly the amount of interstitial carbon and nitrogen, plays an important role in these steels. There are notable issues in the welding of these steels, the most apparent difference to austenitic steels is the susceptibility to brittle failure. This research focused on the influence of minor elements, especially aluminium, calcium, silicon, titanium, niobium, nitrogen and oxygen, on the weldability of modern intermediate purity level stabilized ferritic stainless steels. The research proceeded in several stages. At first, the general characteristics and performance data about the welds in currently manufactured 11 to 21 mass percent chromium ferritic stainless steels in Europe was obtained. The research then focused on novel high chromium stabilized ferritic stainless steels. Lastly, the influence of various steelmaking practices on weldability were investigated. The results showed that in stabilized ferritic stainless steels, slag islands are frequently seen in the molten weld pools. These islands can have many origins, e.g. deoxidation, calcium treatment and stabilization practices, and they can be roughly assessed from the chemical composition of the steel. The nature and the influence of these slags varies and can be related to irregularities in the weldability and molten metal fluid flow. Large grain size and titanium carbonitride particles impair the toughness of the heat-affected zone. Generally, stabilization with niobium is preferred. However, solely niobium stabilized steel welds run the risk of forming coarse columnar grains in welds deteriorating some of the properties. A breakdown of the columnar grains is possible to achieve in autogenous welds with minor titanium and aluminium alloying, provided that small amounts of nitrogen and oxygen are induced from the shielding gas. However, grain refinement may not improve the properties, if it is accomplished with an increase in the total interstitial content
Tiivistelmä Stabiloidut ferriittiset ruostumattomat teräkset soveltuvat korvaamaan tavanomaisia austeniittisia ruostumattomia teräksiä ohutlevysovelluksissa. Näillä teräksillä keskeiset mekaaniset ja korroosio-ominaisuudet ovat usein paremmat kuin varhaisilla, stabiloimattomilla ferriittisillä teräksillä. Hiili ja typpi ovat näissä teräksissä kuitenkin epäpuhtauksia. Toisin kuin austeniittiset teräkset, ferriittiset teräkset ovat alttiita haurasmurtumalle, erityisesti hitsatuissa rakenteissa. Tässä väitöstutkimuksessa keskityttiin mikroseosaineiden ja epäpuhtauksien vaikutukseen keskipuhtaiden stabiloitujen ferriittisten teräslajien hitsauksessa. Tutkimus kohdistui erityisesti alumiinin, kalsiumin, piin, titaanin, niobin, typen ja hapen vaikutuksiin. Aluksi tutkittiin kaupallisten terästen hitsien keskeisiä ominaisuuksia. Tämän jälkeen tutkittiin uusia ns. korkeakromisia stabiloituja ferriittisiä teräslajeja. Lopuksi tutkittiin teräksen valmistuksen vaikutuksia stabiloitujen ferriittisten ruostumattomien terästen hitsattavuuteen. Tutkituilla teräksillä hitsauksen aikana muodostui runsaasti kuonalauttoja. Näillä kuonilla on monta alkuperää, esim. deoksidointi, kalsiumkäsittely ja stabilointiaineet. Hitsien kuonaisuutta voidaan karkeasti arvioida teräksen kemiallisen koostumuksen perusteella. Muodostuvilla kuonilla on useita vaikutuksia hitsauksessa, mm. epäjatkuvuuksiin ja sulan virtauksiin. Hitsauksessa muodostuva suuri raekoko ja stabiloinnin titaanikarbonitridipartikkelit heikentävät oleellisesti hitsin muutosvyöhykkeen sitkeyttä. Stabilointi käyttäen pääasiassa niobia on toivottavaa, mutta jos stabilointiin käytetään vain niobia, tulee hitsin mikrorakenteesta karkea ja hitsin ominaisuudet voivat heikentyä. Karkean mikrorakenteen hienontaminen on mahdollista käyttäen suojakaasuna argonia, jossa on hieman typpeä ja happea, mikäli teräkseen on seostettu hieman alumiinia ja titaania. Raerakenteen hienontaminen ei kuitenkaan yksiselitteisesti paranna hitsin ominaisuuksia, mikäli hienontaminen saavutetaan kasvattamalla epäpuhtauspitoisuutta tarpeettoman korkeaksi
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9

Du, Plessis John. "Control of diffusible weld metal hydrogen through arc chemistry modifications." Diss., Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-05152007-131110.

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Smith, Andrew Logan Mr. "Thermodynamic Evaluation and Modeling of Grade 91 Alloy and its Secondary Phases through CALPHAD Approach." FIU Digital Commons, 2018. https://digitalcommons.fiu.edu/etd/3773.

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Grade 91 (Gr.91) is a common structural material used in boiler applications and is favored due to its high temperature creep strength and oxidation resistance. Under cyclic stresses, the material will experience creep deformation eventually causing the propagation of type IV cracks within its heat-affected-zone (HAZ) which can be a major problem under short-term and long-term applications. In this study, we aim to improve this premature failure by performing a computational thermodynamic study through the Calculation of Phase Diagram (CALPHAD) approach. Under this approach, we have provided a baseline study as well as simulations based on additional alloying elements such as manganese (Mn), nickel (Ni), and titanium (Ti). Our simulation results have concluded that high concentrations of Mn and Ni had destabilized M23C6 for short-term creep failure, while Ti had increased the beneficial MX phase, and low concentrations of nitrogen (N) had successfully destabilized Z-phase formation for long-term creep failure.
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Books on the topic "Ferritic steel. Welding"

1

Bailey, Norman. Weldability of ferritic steels. Cambridge: Abington, 1994.

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Sun, Zheng. Laser beam welding of austenitic-ferritic dissimilar steel joints. Lappeenranta: Lappeenranta University of Technology, 1992.

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Thomas, W. M. Friction stir welding of a ferritic stainless steel: A feasability study. Cambridge: TWI, 1998.

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Wiesner, C. S. The " local approach" to cleavage fracture: Concepts and applications. Cambridge, England: Abington Pub., 1996.

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Sheakley, Brian J. Effect of water depth on the underwater wet welding of ferritic steels using austenitic Ni-based alloy electrodes. Monterey, Calif: Naval Postgraduate School, 2000.

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Bailey, Norman. Weldability of Ferritic Steels. Jaico Publishing House, 2005.

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Bailey, Norman. Weldability of Ferritic Steels. Woodhead Publishing, 1994.

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American Welding Society. Committee on Filler Metals. and American Welding Society. Technical Activities Committee., eds. Standard methods for the determination of diffusible hydrogen content of martensitic, bainitic, and ferritic steel weld metal produced by arc welding. Miami, Fla: American Welding Society, 1993.

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Book chapters on the topic "Ferritic steel. Welding"

1

Sato, Yutaka S., Masahiro Miyake, Shinichi Susukida, Hiroyuki Kokawa, Toshihiro Omori, Kiyohito Ishida, Shinya Imano, Seung Hwan C. Park, Itto Sugimoto, and Satoshi Hirano. "Performance Enhancement of Co-Based Alloy Tool for Friction Stir Welding of Ferritic Steel." In Friction Stir Welding and Processing VIII, 37–46. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119093343.ch4.

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Sato, Yutaka S., Masahiro Miyake, Shinichi Susukida, Hiroyuki Kokawa, Toshihiro Omori, Kiyohito Ishida, Shinya Imano, Seung Hwan C. Park, Itto Sugimoto, and Satoshi Hirano. "Performance Enhancement of Co-Based Alloy Tool for Friction Stir Welding of Ferritic Steel." In Friction Stir Welding and Processing VIII, 39–46. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48173-9_4.

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Tang, Wei, Jian Chen, Xinghua Yu, David A. Frederick, and Zhili Feng. "Heat Input and Post Weld Heat Treatment Effects on Reduced-Activation Ferritic/Martensitic Steel Friction Stir Welds." In Friction Stir Welding and Processing VIII, 83–87. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119093343.ch9.

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Tang, Wei, Jian Chen, Xinghua Yu, David A. Frederick, and Zhili Feng. "Heat Input and Post Weld Heat Treatment Effects on Reduced-Activation Ferritic/Martensitic Steel Friction Stir Welds." In Friction Stir Welding and Processing VIII, 83–87. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48173-9_9.

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Sato, Yutaka S., Hiroyuki Kokawa, Yasuhide Yano, and Yoshihiro Sekio. "Effect of Welding Parameters on the Microstructure and Mechanical Properties of a Friction Stir Welded 11CR-Ferritic/Martensitic Steel." In Friction Stir Welding and Processing VII, 91–99. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-48108-1_10.

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Sato, Yutaka S., Hiroyuki Kokawa, Yasuhide Yano, and Yoshihiro Sekio. "Effect of Welding Parameters on the Microstructure and Mechanical Properties of a Friction Stir Welded 11Cr-Ferritic/Martensitic Steel." In Friction Stir Welding and Processing VII, 91–99. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118658345.ch10.

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Shanjeevi, C., S. Velu, J. Thamilarasan, and S. Satish Kumar. "Parametric Optimization of Friction Welding Parameter of Ferritic Stainless Steel and Copper Material Using Taguchi Approach." In Lecture Notes in Mechanical Engineering, 349–55. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2718-6_32.

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Folkhard, Erich. "Welding Metallurgy of Austenitic-Ferritic Dissimilar Joints." In Welding Metallurgy of Stainless Steels, 229–40. Vienna: Springer Vienna, 1988. http://dx.doi.org/10.1007/978-3-7091-8965-8_12.

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Folkhard, Erich. "Welding Metallurgy of Duplex Austenitic-Ferritic Stainless Steels." In Welding Metallurgy of Stainless Steels, 186–96. Vienna: Springer Vienna, 1988. http://dx.doi.org/10.1007/978-3-7091-8965-8_8.

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Folkhard, Erich. "Welding Metallurgy of Ferritic Stainless Chromium Steels with Carbon Contents Below 0.15%." In Welding Metallurgy of Stainless Steels, 172–78. Vienna: Springer Vienna, 1988. http://dx.doi.org/10.1007/978-3-7091-8965-8_6.

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Conference papers on the topic "Ferritic steel. Welding"

1

Carvalho, S. M., and M. S. F. Lima. "Laser beam welding of an austenitic-ferritic duplex steel and comparison with ARC welding." In ICALEO® 2014: 33rd International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2014. http://dx.doi.org/10.2351/1.5063144.

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Li, HongLiang, Duo Liu, Zhi Wang, Ning Guo, and JiCai Feng. "An Analysis of Microstructure and Microhardness Distribution in Underwater Wet Welding of 304L Austenitic Stainless Steel to Low Alloy Steel 16Mn." In ASME 2018 13th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/msec2018-6434.

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In this study, underwater wet welding of 304L austenitic stainless steel to 16Mn low alloy steel was carried out using self-shielded flux-cored wires at a water depth of 0.3 m. The welds were produced using commercially obtained ER308 filler and specially developed nickel-based tubular wire. Microstructure and microhardness of wet welded joints have been particularly analyzed. The interface between austenitic weld metal and ferritic base metal was also discussed in detail. A robust weld of 304L/16Mn joint could be achieved by FCAW process using nickel-based tubular wire. Commercially obtained ER308 consumables failed to acquire sound welded joints due to large amount of slag remained in the groove. Ni-based weld metal was fully austenitic with well-developed columnar sub-grains while ER308 weld metal consisted of d-ferrite with different morphologies in the austenitic matrix. Type II boundary existed between austenitic weld metal and ferritic base metal. Compared to ER308 weld metal, Ni-based weld metal possessed the ability to be diluted by 16Mn base metal. Maximum hardness values in wet welding appeared in coarse-grained heat affected zone instead of transition zone for both consumables. Austenitic stainless steel welded joints exhibited high microhardness in the transition zone of 16Mn side, which was strongly diluted by ferritic base metal.
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Hamelin, Cory J., Ondrej Mura´nsky, Vladimir Luzin, Philip Bendeich, and Lyndon Edwards. "Accounting for Phase Transformations During Welding of Ferritic Steels." In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57426.

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The numerical application of solid-state phase transformation kinetics relating to conventional welding of ferritic steels is presented. The inclusion of such kinetics in weld models is shown to be necessary for capturing the post-weld residual stress field. To this end, a comparison of two approaches is outlined: a semi-empirical approach that uses thermodynamic transformation kinetics to predict phase morphology; and a fully empirical approach that directly links local material temperature to the present constituent phase(s). The semi-empirical analysis begins with prediction of TTT diagrams using thermodynamic principles for ferritic steels. The data is then converted to CCT diagrams using the Scheil-Avrami additive rule, including austenite grain growth kinetics. This information is used to predict the phases present under varying peak temperatures and cooling rates. In the fully empirical approach, dilatometric experiments of steel samples are performed during heating to simulate expected welding conditions. The constitutive response of the sample is then used as input for the subsequent numerical weld analyses. Input derived from each technique is transferred into weld models developed using the Abaqus finite element package. Model validation is carried out by direct comparison with neutron diffraction residual stress measurements on two beams of SA508 Gr.3 Cl.1 steel subjected to autogenous beam TIG welds under varying torch speeds, heat input and preheat conditions.
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Francis, J. A., H. J. Stone, S. Kundu, R. B. Rogge, H. K. D. H. Bhadeshia, P. J. Withers, and L. Karlsson. "Transformation Temperatures and Welding Residual Stresses in Ferritic Steels." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26544.

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Residual stress in the vicinity of a weld can have a large influence on structural integrity. Here the extent to which the martensite-start temperature of the weld filler metal can be adjusted to mitigate residual stress distributions in ferritic steel welds has been investigated. Three single-pass groove welds were deposited by manual-metal-arc welding on 12mm thick steel plates using filler metals designed to have different martensite-start temperatures. Their residual stress distributions were then characterised by neutron diffraction. It was found that a lower transformation temperature leads to a potentially less harmful stress distribution in and near the fusion zone. The experimental method is reported and the results are interpreted in the context of designing better welding consumables.
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Hamelin, Cory J., Ondrej Muránsky, Philip J. Bendeich, and Lyndon Edwards. "Predicting Post-Weld Residual Stresses in Ferritic Steel Weldments." In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78073.

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The implementation of a semi-empirical solid-state phase transformation subroutine in the ABAQUS finite element package is presented to predict the influence of transformation strain on the post-weld residual stress field in ferritic steels. The phase transformation subroutine has been outlined in a previous study (PVP2011-57426), where it was proven accurate in predicting the phase compositions in the fusion and heat affected zone (HAZ) of an autogenous TIG beam weld in SA508 Gr.3 Cl.1 steel. While previous work focused on predictions of the steady-state material response using a 2D thermal model, the present analyses are 3D and capture the varying phase composition at weld start- and stop-ends. Predicted cooling rates at either end of the specimen are significantly higher, leading to a variation in the predicted microstructure along the weld line. To better understand the structural changes that occur in ferritic steels during a conventional welding process, a representative model of SA508 Gr.3 Cl.1 steel is discussed. The contribution of thermal, metallurgical, and transformation-induced plastic strain is highlighted in this example, providing insight to the key simulation variables necessary for accurate weld models of ferritic steels. Preliminary coupled thermo-mechanical analyses are presented that compare predicted residual stress distributions with those measured in SA508 Gr.3 Cl.1 beam welds via neutron diffraction; good agreement is observed.
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Fritz, James D., and Curtis W. Kovach. "Qualification of Laser Welded High Performance S44660 Ferritic Stainless Steel for Condenser Tube Applications." In International Joint Power Generation Conference collocated with TurboExpo 2003. ASMEDC, 2003. http://dx.doi.org/10.1115/ijpgc2003-40102.

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The laser tube welding process has for the first time been used to produce power plant steam condenser tubing in the high performance ferritic stainless steel grade UNS S44660. This material has traditionally been produced as welded tubing by the gas tungsten-arc welding process for use in seawater and other severe cooling water environments. To verify the corrosion resistance of this new product, corrosion tests have been conducted on production tubing to compare the traditional and new welding processes. The acidified ferric chloride test was used for evaluation because it is a meaningful aggressive test capable of measuring resistance to localized pitting corrosion, the most common potential failure mode for stainless steels used in cooling water environments. Pitting tests conducted over a range of temperatures produced a critical pitting temperature of 65°C for laser welded-annealed tube. This critical pitting temperature was demonstrated to be equal to that of as-produced S44660 sheet material or that of gas tungsten-arc produced tubing. The tubing met all other metallurgical and mechanical property quality requirements. When pitting did occur it exhibited no preference for initiation at welds. Thus, laser welded. high performance stainless condenser tubing should be fully capable of providing good performance in severe cooling water environments.
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7

Sun, Aili, Jie Liu, and Wenkai Liu. "The laser-beam welding of ferritic stainless steel for the motor vehicle exhaust 409L." In Mechanical Engineering and Information Technology (EMEIT). IEEE, 2011. http://dx.doi.org/10.1109/emeit.2011.6023918.

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Abdolvand, Hamidreza, John A. Francis, Feridoon Azough, Joanna N. Walsh, Christopher M. Gill, and Philip J. Withers. "On the Thermo-Mechanical Behaviour of SA508 Grade 4 Ferritic Steel." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28972.

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The development of residual stresses in the Heat Affected Zone (HAZ) during welding of a ferritic steel can be critical to weld structural integrity. The Prior Austenite Grain Size (PAGS), the thermo-mechanical properties of the phases that develop during phase transformation, and the transformation strains are some of the key parameters that can alter residual stress development during welding. Understanding the trend in variation of these parameters is crucial for Finite Element (FE) modelling of residual stress development in weld. In this study, the effect of PAGS on the phase transformation in SA508 grade 4 was determined. For this purpose, samples were heated up to 900, 1050, 1250, and 1350°C and held for various time intervals to produce different austenite grain sizes. The measured austenite grain sizes were then used to fit parameters in an exponential equation implemented in an FE User MATerial subroutine (UMAT) for the modelling of welds. With performing various free dilatometry experiments, it is shown that the only phase that austenite transforms to upon cooling is martensite. In addition, the mechanical properties of as-received material, austenite, and martensite as a function of temperature were measured. Also, various uni-axial loads were applied during cooling cycles, and before the onset of phase transformations, to measure the evolution of transformation strain to generate an empirical formulation for numerical modelling.
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9

Wang, Yonghui, Shengsun Hu, and Junqi Shen. "Study on the activated laser welding of ferritic stainless steel with rare earth elements yttrium." In Applied Optics and Photonics China (AOPC2015), edited by Lin Li, Minghui Hong, and Lan Jiang. SPIE, 2015. http://dx.doi.org/10.1117/12.2199717.

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Herter, Karl-Heinz, Xaver Schuler, Michael Hoffmann, and Peter Kopp. "Fatigue Behavior of Dissimilar Welds Used for Nuclear Piping." In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97400.

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Due to specific requirements in NPP piping different materials are used and connected by dissimilar welds (DM). The fatigue behavior of such welds must be known for design and safety evaluations. The overall fatigue behavior of welds depends on the properties of the different weld sections and their interaction. The welding may influence the fatigue behavior of the base materials in the vicinity of the weld. The investigation deals with the fatigue behavior of DM typical for German NPP: ferritic steel 20MnMoNi5-5 welded to austenitic steel X6CrNiNb18-10 using nickel based alloy for buttering. Fatigue specimens were taken from each region of the weld (ferritic steel near weld, buttering, connection weld, austenitic steel near weld). Additionally specimens were taken containing two adjacent material regions and the respective fusion line. For each position specimens were tested in fully reversed strain controlled conditions at room temperature and total strain amplitude of 0.25%. The results were compared with the best-fit curves for austenitic and ferritic steels.
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