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Dissertations / Theses on the topic 'Duplex Stainless Steel'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

Hutchings, D. "Hydrogen embrittlement of duplex stainless steel." Thesis, University of Manchester, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.631722.

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Duplex stainless steels (DSS's) are frequently used in oil and gas production and are subsequently subjected to cathodic protection. There is now growing concern about the cathodic evolution of hydrogen produced from this protection system, which may diffuse into the alloy and cause an embrittled condition. DSS's have a microstructure that is a mixture of austenite and ferrite and combines the advantages of these grades, whilst minimising their deficiences. In this research, Zeron 100 DSS was studied in six conditions to investigate the effects of hydrogen embrittlement (HE) on the various str

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2

Sture, Henrik. "Integrity Evaluation of Duplex Stainless Steel Flanges." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for produktutvikling og materialer, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19055.

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Duplex stainless steel flanges are normally forged to form, as required by the ASTM A182/A182M standard, but may also potentially be machined directly from forged stainless steel bar. In order to evaluate the integrity of such flanges, axisymmetric elastic-plastic finite element models have been developed, considering static effects such as bolt load and internal pressure. Additionally, tensile testing of a sample forged bar (UNS S31803) has been conducted. The stress distribution in a flange during gasket seating and operating conditions has been determined, as well as the degree of plastic s

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3

Dalton, John Christian. "Surface Hardening of Duplex Stainless Steel 2205." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1480696856644048.

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4

Farrell, J. "Hyperbaric welding of duplex stainless steel pipelines offshore." Thesis, Cranfield University, 1996. http://dspace.lib.cranfield.ac.uk/handle/1826/4513.

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Three duplex stainless steels (Avesta 2205, Sandvik SAF2507 and Zeron 100) were successfully welded automatically at a range of pressures from 1 to 32bar. The gas tungsten arc (GTA) welding process was chosen as it allows a high degree of control to be exercised during welding. Initial autogenous bead on plate welds established the effects of pressure on the welding process and allowed the process parameters to be determined for subsequent experiments. Analysis of the effects of pressure on the weld thermal cycle showed that at higher pressures the precipitation of phases deleterious to the we

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5

Marrow, Thomas James. "Fatigue mechanisms in an embrittled duplex stainless steel." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386998.

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6

Rieder, Ester Schmidt. "The passivity of a super duplex stainless steel." Thesis, University of Birmingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272490.

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7

Shendye, Sanjay B. "Effect of long term elevated temperature exposure on the mechanical properties and weldability of cast duplex stainless steels /." Full text open access at:, 1985. http://content.ohsu.edu/u?/etd,115.

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8

Haddad, Naseem Issa Abdallah. "The development of microstructure in duplex stainless steel welds." Thesis, University of Cambridge, 1990. https://www.repository.cam.ac.uk/handle/1810/221890.

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9

Fang, Peijun. "Weldability and hydrogen relationships in super duplex stainless steel." Thesis, Robert Gordon University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260057.

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10

Wang, Huei-Sen. "Thermal modelling of zeron 100 super duplex stainless steel." Thesis, Robert Gordon University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287771.

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11

Renton, N. C. "Time-variant reliability of super-duplex stainless steel tubulars." Thesis, University of Aberdeen, 2007. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU239879.

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The development of high pressure-high temperature oil wells in the U.K.'s north sea province has led to the application of high-strength, corrosion resistant alloys for production tubulars. One such alloy is super-duplex stainless steel (SDSS). The cold-worked material combines high strength with excellent corrosion resistance properties as a result of its chromium, molybdenum, tungsten and nitrogen content. The material's macro properties are a function of its two-phase microstructure made up of roughly equal parts austenite and ferrite. Recent in-service failures of SDSS tubulars have identi

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12

Sieurin, Henrik. "Fracture toughness properties of duplex stainless steels." Doctoral thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3964.

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13

Bhattacharya, Ananya. "Stress corrosion cracking of duplex stainless steels in caustic solutions." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26491.

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Thesis (Ph.D)--Materials Science and Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Singh, Preet M.; Committee Member: Carter, W. Brent; Committee Member: Gokhale, Arun, M.; Committee Member: Neu, Richard; Committee Member: Sanders, Thomas H., Jr.. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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14

Iversen, Torunn Hjulstad. "Intragranular Chromium Nitride Precipitates in Duplex and Superduplex Stainless Steel." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18904.

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Intragranular chromium nitrides is a phenomenon with detrimental effects on material properties in superduplex stainless steels which have not received much attention. Precipitation of nitrides occurs when the ferritic phase becomes supersaturated with nitrogen and there is insufficient time during cooling for diffusion of nitrogen into austenite. Heat treatment was carried out at between 1060&#9702;C and 1160&#9702;C to study the materials susceptibility to nitride precipitation with varying heat treatment temperature, nitrogen content and microstructure. Microhardness tests and Charp

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15

Saliba, Najib. "Structural behaviour of lean duplex stainless steel welded I-sections." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/39853.

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Despite growing interest in the use of stainless steel in the construction industry and the development of a number of national and regional design codes, stainless steel is often regarded as only suitable for specialised applications. This is attributed largely to the high initial material cost associated with the most commonly adopted austenitic grades of stainless steel, as well as some conservatism embedded in current stainless steel guidance. A recently developed grade, known as lean duplex stainless steel (EN 1.4162), possesses higher strength than the common austenitic grades and has a

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16

McKenzie, S. G. "The effect of platinum group metals on duplex stainless steel." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37782.

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17

Ávila, Braz Thaís. "Shrinkage Calculation in the Continuous Casting of Duplex Stainless Steel." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-76516.

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18

Obi, Udoka. "Effect of ageing on phase evolution, mechanical and corrosion properties of a high tungsten super-duplex stainless steel." Thesis, University of Aberdeen, 2015. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=225950.

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Super duplex stainless steels (SDSSs) with lower nickel content are cost effective substitutes for higher alloyed austenitics and nickel alloys in demanding environments such as oil and gas production tubulars and pipelines due to their excellent corrosion resistance and high strength. The overall properties of SDSS are derived from its dual microstructure of equal ferrite and austenite, higher alloying additions of chromium, molybdenum, nitrogen and tungsten and its thermomechanical history. Higher alloying renders SDSS prone to secondary phase precipitation such as sigma phase during imprope

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19

石燦鴻 and Chan-hung Shek. "Ferrite decomposition in duplex stainless steel and its application intemperature measurement." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B31233880.

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20

Alhoud, Abdulrezeg M. A. "Effect of process variables on the corrosion resistance of super duplex stainless steel." Thesis, University of Aberdeen, 2010. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=128219.

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The title of this research suggests the importance of manufacturing variables and their influence on the behavior of super duplex stainless steel (SDSS) alloy when exposed to corrosive aqueous environments. Studies show that SDSS alloys have many applications due to their good physical, mechanical and corrosion resistance properties. However, there are a number of cases of in-service failures of SDSS alloys, such as pitting corrosion, stress corrosion cracking and environmentally assisted cracking failures. The root cause of these failures was due to the impact of one or more manufacturing var

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21

Elsherief, Ahmed Fathy Abd Elshafi. "The structure, mechanical and corrosion properties of duplex stainless weldments." Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303482.

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22

Alsarraf, Jalal. "Hydrogen embrittlement susceptibility of super duplex stainless steels." Thesis, Cranfield University, 2010. http://dspace.lib.cranfield.ac.uk/handle/1826/4562.

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This thesis describes the metallurgical and environmental factors that influence hydrogen embrittlement of super duplex stainless steels and presents a model to predict the rate at which embrittlement occurs. Super duplex stainless steel has an austenite and ferrite microstructure with an average fraction of each phase of approximately 50%. An investigation was carried out on the metallurgical and environmental factors that influence hydrogen embrittlement of super duplex stainless steels. Tensile specimens of super duplex stainless steel were pre-charged with hydrogen for two weeks in 3.5% Na

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23

Huang, Yun'er, and 黃韵兒. "Behaviour and design of cold-formed lean duplex stainless steel members." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/195980.

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Cold-formed stainless steel sections have been increasingly used in architectural and structural applications. Yet the high price of stainless steel limits the application to construction projects. The lean duplex stainless steel (EN 1.4162) offers an opportunity for stainless steels to be used more widely due to its competitive in price, good mechanical properties and corrosion resistance. The lean duplex stainless steel is a relatively new material, and research on this material is limited. Currently, the lean duplex stainless steel is not covered in any design specification, and no design r

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24

Yang, Di. "Cyclic stress effect on stress corrosion cracking of duplex stainless steel in chloride and caustic solutions." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42811.

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Duplex stainless steel (DSS) is a dual-phase material with approximately equal volume amount of austenite and ferrite. It has both great mechanical properties (good ductility and high tensile/fatigue strength) and excellent corrosion resistance due to the mixture of the two phases. Cyclic loadings with high stress level and low frequency are experienced by many structures. However, the existing study on corrosion fatigue (CF) study of various metallic materials has mainly concentrated on relatively high frequency range. No systematic study has been done to understand the ultra-low frequency (

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25

Shek, Chan-hung. "Ferrite decomposition in duplex stainless steel and its application in temperature measurement /." [Hong Kong : University of Hong Kong], 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13867660.

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26

Olden, Vigdis. "FE modelling of hydrogeninduced stress crackingin 25% Cr duplex stainless steel." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for produktutvikling og materialer, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-5026.

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27

Ornek, Cem. "Performance characterisation of duplex stainless steel in nuclear waste storage environment." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/performance-characterisation-of-duplex-stainless-steel-in-nuclear-waste-storage-environment(4db73e9b-c87c-40a6-9778-0b823b1c499f).html.

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The majority of UK’s intermediate level radioactive waste is currently stored in 316L and 304L austenitic stainless steel containers in interim storage facilities for permanent disposal until a geological disposal facility has become available. The structural integrity of stainless steel canisters is required to persevere against environmental degradation for up to 500 years to assure a safe storage and disposal scheme. Hitherto existing severe localised corrosion observances on real waste storage containers after 10 years of exposure to an ambient atmosphere in an in-land warehouse in Culham

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28

Payares, Rios de Asprino M. C. "Numerical modelling of optimum microstructure behaviour in duplex stainless steel weldments." Thesis, Swansea University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638433.

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A comprehensive study of DSS SAF 2205 weldments and nature of weld metal and heat-affected zones has been undertaken. Several DSSs SAF 2205 welds were fabricated using GMAW welding process at different welding conditions. The investigation focuses on the effect of the welding parameters are current, arc voltage, welding speed and heat input on the weld geometry, microstructure and mechanical properties. Also, the technique of the determination of “Response Surface” for the welding parameters was focused to optimise the effects on them each dependent. Variable. All weldments had the UTS, the yi

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29

張榮祥 and Wing-cheung Cheung. "Short-term isothermal annealing of a cold rolled duplex stainless steel." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31215129.

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30

Silva, Eloy de Macedo. "Fractal analysis of fracture surface of Duplex Stainless steel UNS S31803." Universidade Federal do CearÃ, 2002. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=7306.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>In the last years, the fractal geometry has become widely studied. Its application in several areas increased substantially, particularly in materials engineering and science, aiming the analysis of failures and the study of the mechanical properties of materials. Some studies have shown the relationship between the fracture surfaces and their mechanical properties using the fractal geometry and its properties of fractal dimension and selfsimilarity. In this research, the fracture surface of duplex stainless steel, which was obtain

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31

Al-Rabie, Mohammed. "Observations of stress corrosion cracking behaviour in super duplex stainless steel." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/observations-of-stress-corrosion-cracking-behaviour-in-super-duplex-stainless-steel(51f53ed4-7bdc-469a-8ff7-7dfd9ff56339).html.

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The new generation of highly alloyed super duplex stainless steels such as Zeron 100 are preferable materials for industrial applications demanding high strength, toughness and superior corrosion resistance, especially against stress corrosion cracking (SCC). SCC is an environmentally assisted failure mechanism that occurs due to exposure to an aggressive environment while under a tensile stress. The mechanism by which SCC of duplex stainless steel is expected to suffer depends on the combination of electrochemical and the mechanical interaction between austenite and ferrite in the duplex allo

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32

Cheung, Wing-cheung. "Short-term isothermal annealing of a cold rolled duplex stainless steel /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19131926.

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33

Adams, FV, PA Olubambi, FH Potgieter, and Der Merwe F. Van. "Corrosion resistance of duplex stainless steels in selected organic acids and organic acid/chloride environments." Anti-Corrosion Methods and Materials, 2010. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001195.

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Abstract Purpose – The purpose of this paper is to supplement the scant previous investigations on the corrosion behaviour of 2205 and 2507 duplex stainless steels in selected organic acids containing chloride additions. Design/methodology/approach – Microstructural examination of the alloys was first carried out, after which the corrosion behaviour of the alloys in citric, oxalic, formic and acetic acids containing chloride additions at varying temperatures was studied using electrochemical techniques. Findings – The alloy 2507 material had a larger grain size than did the alloy 2205 sample.

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Dana, Seresht Mahmoudreza. "Material Selection for Deepwater Gate Valves." Thesis, KTH, Materialvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-170023.

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Material selection is an important step during the design process of an object. The goal is to produce an object to meet the requirement with minimum cost. During the recent years with discovery of oil and gas in deep water, oil and gas industry facing new challenges of handling corrosive material in seabed that gives more importance and criticality to material selection of equipment for this kind of application. Hydrogen sulfide (H2S), chloride and carbon dioxide (CO2) have made the big challenges for material that handle corrosive fluids in the seabed.This report presents a brief review of m

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35

Ruiner, Thomas H. "Characterization of thermal damage in 2205 duplex stainless steel with nonlinear ultrasonics (nlu)." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37156.

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Duplex stainless steels have a microstructure that consists of almost equal shares of austenite and ferrite, which leads to excellent material properties. During production and processing, the steel can be exposed to high temperatures which leads to the development of a third (sigma) phase, and thus to a change in material properties. The objective of this research is to assess the material damage in thermally degraded 2205 duplex stainless steel using nonlinear ultrasonics (NLU). Seven 2205 duplex stainless steel specimens are thermally degraded at 700 C for a series of different time duratio

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36

Kuan, Hong Cheng. "Influences of phase transformations on the pitting corrosion behavior of wrought duplex stainless steel in different environments." Thesis, University of Macau, 2018. http://umaclib3.umac.mo/record=b3948877.

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37

Martins, Alessandra Souza. "Estudo comparativo da resistÃncia Ã corrosÃo dos aÃos inoxidÃveis super duplex ASTM A890 / A890M grau 5A e 6A." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12591.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>Uma liga metÃlica que vem apresentando um desempenho satisfatÃrio em ambientes de maior agressividade Ã o aÃo inoxidÃvel super duplex. Esse tipo de aÃo possui boas propriedades de resistÃncia mecÃnica, resistÃncia Ã corrosÃo e tenacidade ao impacto. Mesmo apresentando desempenho satisfatÃrio, esses aÃos podem apresentar problemas de corrosÃo quando sofrem algum tratamento tÃrmico devido Ã precipitaÃÃo de uma fase deletÃria chamada de alfa linha (â), a qual precipita em temperaturas entre 300 ⁰C e 550 ⁰C e pode o

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38

El-Yazgi, Abdullatif Abdallah. "The effect of hydrogen on the mechanical behaviour of duplex stainless steel." Thesis, University of Newcastle Upon Tyne, 1995. http://hdl.handle.net/10443/719.

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Duplex stainless steels are commonly used in environments that are expected to produce hydrogen i. e. in sour environments and sea water applications, often under cathodic protection. Under these conditions there is a concern about their susceptibility to hydrogen embrittlement. The effect of hydrogen, both external and internal, on the mechanical properties and the fracture characteristics of duplex stainless steels Type 2205 and 2507 have been studied by slow strain rate techniques using smooth tensile specimens. Specimens were strained to failure in air after high pressure hydrogen thermal

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39

Shoja, Chaeikar Siamak. "Examination of inclusion size distributions in duplex stainless steel using electrolytic extraction." Thesis, KTH, Materialvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-161750.

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Nowadays due to large demand for clean and defect-free steels, several techniques based on different characteristics of particles are applied to investigate the steel cleanness. Outokumpu Stainless AB in Avesta has performed extensive work in this field by applying several methods, which all of them have specific advantages and limitations. However, it is necessary to find an accurate technique to investigate real properties of inclusions in duplex stainless steels. For routine analytical methods, calibration and parameters adjustment can be followed by help of these investigation results. The

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Garcia, Erick Renato Vargas. "Efeito da corrente de soldagem do processo TIG pulsado autógeno na microestrutura da zona fundida dos aços inoxidáveis duplex UNS S32304 e UNS S32101." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-12032012-121409/.

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A microestrutura e a composição química dos aços inoxidáveis duplex são responsáveis pela sua resistência mecânica e sua resistência à corrosão que, geralmente, é superior aos aços inoxidáveis ferríticos e austeníticos convencionais. A soldagem destes materiais causa tanto alteração de microestrutura como de composição química, que podem ser alteradas dependendo dos processos de soldagem, dos parâmetros de soldagem, da utilização ou não de metal de adição e da composição química do gás de proteção, nos processos que utilizam proteção gasosa. No caso dos aços inoxidáveis duplex baixa liga, a so

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Reynolds, Nicholas A. "Behavior and design of concentrically loaded duplex stainless steel single equal-leg angle struts." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49074.

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Stainless steel has garnered attention as an alternative structural material to conventional carbon steel due to its corrosion resistance properties and aesthetic appearance. Of interest are single angles, which are frequently used in trusses, transmission towers, and as bracing diaphragms. When subjected to compression, knowledge concerning the behavior, analysis, and design of stainless steel single angles is very limited. This thesis addresses the behavior of duplex stainless steel single equal-leg angles subject to concentric compressive loading. Two complementary approaches are used

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42

Smuk, Olena. "Microstructure and properties of modern P/M super duplex stainless steels." Doctoral thesis, KTH, Materials Science and Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3758.

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43

Müller, Peter. "Korozní odolnost litých duplexních ocelí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417137.

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The master’s thesis deals with corrosion resistance of cast duplex steels. In the first part the corrosion mechanisms and their individual types are described, the second part characterizes the types of stainless steels in terms of their properties, use, structural components, and their impact on mechanical and corrosion properties of steels. Individual chapter is dedicated to duplex steels. In the experimental part the resistance of 1.4517 steel against pitting corrosion depending on the alloy contents and the PREN value was investigated. Four specimens graded according to PREN were cast. Sup

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44

Mostafaee, Saman. "A Study of EAF Austenitic and Duplex Stainless Steelmaking Slags Characteristics." Licentiate thesis, KTH, Materials Science and Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12064.

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<p>The high temperature microstructure of the solid phases within the electric arc furnace (EAF) slag has a large effect on the process features such as foamability of the slag, chromium recovery, consumption of the ferroalloys and the wear rate of the refractory. The knowledge of the microstructural and compositional evolution of the slag phases during the EAF process stages is necessary for a good slag praxis.</p><p>In <strong>supplement 1</strong>, an investigation of the typical characteristics of EAF slags in the production of the AISI 304L stainless steel was carried out. In addition, co

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45

Westin, Elin M. "Microstructure and properties of welds in the lean duplex stainless steel LDX 2101." Doctoral thesis, KTH, Metallografi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-27387.

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Duplex stainless steels can be very attractive alternatives to austenitic grades due to their almost double strength at equal pitting corrosion resistance. When welding, the duplex alloys normally require addition of filler metal, while the commodity austenitic grades can often be welded autogenously. Over-alloyed consumables are used to counteract segregation of important alloying elements and to balance the two phases, ferrite and austenite, in the duplex weld metal. This work focuses on the weldability of the recently-developed lean duplex stainless steel LDX 2101® (EN 1.4162, UNS S32101).

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46

Kabir, Md Jahidul. "Transient liquid phase bonding of a duplex stainless steel and assessment using ECT." Thesis, Brunel University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408905.

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47

Humphreys, Alan Owen. "The low temperature fracture behaviour of the super duplex stainless steel Zeron 100." Thesis, University of Birmingham, 1998. http://etheses.bham.ac.uk//id/eprint/1427/.

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The micromechanisms of fracture in an austenitic/ferritic super-duplex stainless steel (Zeron 100) have been studied for a range of product forms, including cross-rolled plate, conventional (ingot) route and powder route extruded pipe, hot isostatically pressed (HIP'd) powder, and weldments produced using both tungsten inert gas (TIG) and manual metal arc (MMA) techniques. The rolled plate material was also investigated after heat treatments at temperatures of 425 and 850°C, which were known to embrittle the material.

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48

Pilhagen, Johan. "The fracture mechanisms in duplex stainless steels at sub-zero temperatures." Doctoral thesis, KTH, Materialteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-133677.

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The aim of the thesis was to study the susceptibility for brittle failures and the fracture process of duplex stainless steels at sub-zero temperatures (°C). In the first part of the thesis plates of hot-rolled duplex stainless steel with various thicknesses were used to study the influence of delamination (also known as splits) on the fracture toughness. The methods used were impact and fracture toughness testing. Light optical microscopy and scanning electron microscopy were used to investigate the microstructure and fracture surfaces. It was concluded that the delaminations caused a loss of

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Chasse, Kevin Robert. "A study on the mechanism of stress corrosion cracking of duplex stainless steel in hot alkaline-sulfide solution." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/42793.

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Abstract:

Corrosion and stress corrosion cracking of structural components cost an estimated $300 billion annually in the United States alone and are a safety concern for a number of industries using hot alkaline environments. These process environments may contain different amounts of sulfide and chloride; however, the combined role of these ions on the stress corrosion cracking of duplex stainless steels, which are widely used because of their generally reliable performance, had never been studied. This study shows that chlorides in sulfide-containing caustic environments actually have a significant i

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Said, Eman. "On the deflection of s32003 stainless steel beams." Thesis, Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/54918.

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Abstract:

Presented in this work are the results of twelve flexural tests conducted on small-scale coupons to establish the load-deflection behavior of UNS S32003 (ATI 2003®) hot-rolled duplex stainless steel flat plates. All specimens were tested as simply supported beams loaded at the midspan. Test specimens had nominal width and thickness of 1 in. and 0.25 in., respectively. Four different span lengths of 4 in., 6 in., 9 in., and 12 in. were investigated. Analysis of the results showed that the non-linear deflection behavior can be estimated reasonably well by adopting the conventional deflection equ

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