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Dissertations / Theses on the topic 'Duplex stainless steels (DSS)'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Arikan, Mehmet Emin. "Determination Of Susceptibility To Intergranular Corrosion Of Uns 31803 Type Duplex Stainless Steel By Electrochemical Reactivation Technique." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609886/index.pdf.

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In the present work the effect of isothermal ageing treatment on the microstructure and on the localized corrosion resistance of a duplex stainless steel (DSS) was investigated. Specimens taken from a hot rolled cylindrical duplex stainless bar with 22% Cr grade were solution annealed at 1050&deg<br>C and then sensitization heat treatments were conducted at 650, 725 and 800&deg<br>C with duration ranging from 100 to 31622 min. The microstructural changes were examined by the light optical microscopy (LOM) and scanning electron microscopy (SEM). XRD technique and EDS analysis were used for micr

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2

Giard, Baptiste, and Sofia Karlsson. "Machine learning for the prediction of duplex stainless steel mechanical properties : Hardness evolution under low temperature aging." Thesis, KTH, Materialvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298415.

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Duplex stainless steels, DSS are stainless steels that consist of the two phases austenite and ferrite. The DSS have superb properties and are widely used in industries such as nuclear power and in pressure vessels, pipes and in pipelines. The use of DSS are limited due to embrittlement which occurs at temperatures from 250 to 550 oC. This imposes a general limited service temperature of 250 oC. The mechanism mainly responsible for the embrittlement is a phase separation occurring in the ferrite phase. Furthermore, there is a direct link between the phase separation and the mechanical proper

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3

Baumhauer, Christophe. "Influence du niobium sur la microstructure et les propriétés d'usage des aciers inoxydables austéno-ferritiques (duplex)." Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENI087/document.

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Les aciers inoxydables sont employés dans des secteurs d’activitéspour lesquels les caractéristiques mécaniques et la résistance à lacorrosion sont primordiaux. Les nuances austéno-ferritiques sansmolybdène (lean-duplex), ont une résistance à la corrosion et despropriétés mécaniques supérieures aux aciers inoxydables austénitiques.Cependant, leur usinabilité est inférieure à celle de leur homologueausténitique. Pour améliorer cette propriété des éléments peuvent êtreajoutés dans les nuances, tel que le niobium. L’objectif de cette étude estd’améliorer l’usinabilité des lean-duplex sans dégrade

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4

Garfias-Mesias, Luis Francisco. "Pitting corrosion of duplex stainless steels." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318008.

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5

Martin, Guilhem. "Hot workability of duplex stainless steels." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00721764.

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Les aciers inoxydables austéno-ferritiques présentent une microstructure biphasée dans laquelle se mêlent austénite et ferrite. Leurs caractéristiques mécaniques élevées ainsi que leur bonne tenue en corrosion en font un candidat sérieux pour remplacer les aciers inoxydables austénitiques. Malheureusement, la faible forgeabilité de ces alliages rend la fabrication de tôles particulièrement critique. En effet, le phénomène de " crique de rive " est fréquemment rencontré au cours des étapes du laminage à chaud. Par conséquent, cela nécessite des opérations supplémentaires comme le découpage des

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6

Soylu, B. "Phase tranformations in duplex stainless steels." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235281.

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7

Sharafi, Shahriar. "Microstructure of super-duplex stainless steels." Thesis, University of Cambridge, 1993. https://www.repository.cam.ac.uk/handle/1810/221879.

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8

Lechartier, Audrey. "Influence de la transformation martensitique induite par la déformation sur le comportement mécanique d’aciers inoxydables duplex." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI107/document.

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Les aciers inoxydables duplex présentent une combinaison intéressante entre des propriétés mécaniques élevées, une faible conductivité thermique et un coût relativement faible. Ils sont couramment employés dans le domaine du bâtiment comme rond à béton, application qui requière notamment une résistance élevée (Rm > 950 MPa) et une ductilité importante (A% > 15). Cette thèse a pour objectif d’améliorer le compromis résistance / allongement, en développant de nouvelles nuances duplex présentant une transformation martensitique induite par la plasticité (effet TRIP) aux caractéristiques con

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9

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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10

Mohammed, Farej Ahmed. "Stress corrosion cracking in duplex stainless steels." Thesis, University of Manchester, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488331.

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11

Kim, Yoon-Jun. "Phase Transformations in Cast Duplex Stainless Steels." Ames, Iowa : Oak Ridge, Tenn. : Ames Laboratory ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2004. http://www.osti.gov/servlets/purl/837274-V0QAJQ/webviewable/.

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Thesis (Ph.D.); Submitted to Iowa State Univ., Ames, IA (US); 19 Dec 2004.<br>Published through the Information Bridge: DOE Scientific and Technical Information. "IS-T 2322" Yoon-Jun Kim. US Department of Energy 12/19/2004. Report is also available in paper and microfiche from NTIS.

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12

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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13

Cohen, Laura Jane Rachel. "Some effects of hydrogen on duplex stainless steels." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292256.

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14

Moverare, Johan J. "Microstresses and anisotropic mechanical behaviour of duplex stainless steels /." Linköping : Univ, 2001. http://www.bibl.liu.se/liupubl/disp/disp2001/tek699s.pdf.

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15

Salinas-Bravo, Victor Manuel. "Pitting and stress corrosion cracking of duplex stainless steels." Thesis, University of Manchester, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493165.

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16

Jepson, Mark A. E. "Oxidation of austenitic and duplex stainless steels during primary processing." Thesis, Loughborough University, 2008. https://dspace.lboro.ac.uk/2134/4435.

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17

Mayaki, Muyiwa Christopher. "Aspects of fatigue crack propagation behaviour of duplex stainless steels." Thesis, University of Nottingham, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375924.

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18

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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19

Liang, Xingzhong. "Microstructure evolution and hydrogen embrittlement in super duplex stainless steels." Thesis, University of Leicester, 2018. http://hdl.handle.net/2381/42527.

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Super duplex stainless steel has a wide range of applications in chemical transport and processing facilities, especially in subsea oil and gas pipelines. A desirable combination of corrosion resistance and mechanical properties can be delivered by a balanced duplex microstructure. However, the microstructure of steel can be altered during processing, which can result in degradation of mechanical properties and corrosion resistance. In offshore environment, cathodic protection is widely used to improve corrosion resistance of gas and oil transportation pipelines. However, the application of ca

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20

Masters, G. L. "Crevice corrosion of austenitic and duplex stainless steels in seawater." Thesis, Cranfield University, 1994. http://dspace.lib.cranfield.ac.uk/handle/1826/11288.

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Duplex stainless steels are finding increasing use in seawater applications, but are prone to attack by crevice corrosion. A mechanism of deaeration and acidification is thought to produce locally aggressive conditions within the crevice. A variety of experimental techniques were therefore used to investigate the crevice corrosion resistance of some commercial duplex stainless steels in seawater and other, more aggressive Cr-containing environments. The established marine grade 316L austenitic stainless steel was used for reference purposes. The investigations provided both quantitative data r

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21

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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22

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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23

Tofique, Muhammad Waqas. "Very high cycle fatigue of duplex stainless steels and stress intensity calculations." Licentiate thesis, Karlstads universitet, Institutionen för ingenjörsvetenskap och fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-34591.

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Very high cycle fatigue (VHCF) is generally considered as the domain of fatigue lifetime beyond 10 million (107) load cycles. Few examples of structural components which are subjected to 107-109 load cycles during their service life are engine parts, turbine disks, railway axles and load-carrying parts of automobiles. Therefore, the safe and reliable operation of these components depends on the knowledge of their fatigue strength and the prevalent damage/failure mechanisms. Moreover, the fatigue life of materials in the VHCF regime is controlled by the fatigue crack initiation and early growth

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24

Kömi, J. (Jukka). "Hot ductility of austenitic and duplex stainless steels under hot rolling conditions." Doctoral thesis, University of Oulu, 2001. http://urn.fi/urn:isbn:9514265602.

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Abstract The effects of restoration and certain elements, nitrogen, sulphur, calcium and Misch metal, on the hot ductility of austenitic, high-alloyed austenitic and duplex stainless steels have been investigated by means of hot rolling, hot tensile, hot bending and stress relaxation tests. The results of these different testing methods indicated that hot rolling experiments using stepped specimens is the most effective way to investigate the relationship between the softening and cracking phenomena under hot rolling conditions. For as-cast, high-alloyed and duplex stainless steels wit

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25

Sriram, Rajagopal. "Corrosion fatigue and pitting behaviour of duplex stainless steels in chloride solutions." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/29295.

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The pitting and corrosion fatigue (CF) behaviour of two commercial duplex stainless steels (SS), one cast and other wrought, were studied in chloride solutions. One solution was a simple chloride (1M NaCl) and the other was a synthetic white water containing a lower concentration of chloride, together with oxidized sulphur species (thiosulphate). Differences in composition between the ferrite and austenite phases were determined by micro-analytical techniques. The pitting studies showed that the pitting potentials and the preferential pitting of the ferrite or austenite phases were dependent u

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26

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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27

LUENGAS, LILIA OLAYA. "PHYSICAL SIMULATION AND CHARACTERIZATION OF HEAT AFFECTED ZONE (HAZ) IN DUPLEX STAINLESS STEELS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2017. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=32940@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO<br>PROGRAMA DE DOUTORADO SANDUÍCHE NO EXTERIOR<br>Os aços inoxidáveis duplex (AID) possuem uma estrutura mista de Delta-ferrita e Gamma-austenita em frações de volume aproximadamente iguais e combinam muitas das propriedades benéficas das duas fases, a ferrita fornece alta resistência mecânica e resistência à corrosão, enquanto que a austenita aumenta a ductilidade e a resistência à corrosão uniforme. Uma vantagem dos AID

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28

Varol, Ilhan. "Microstructure/property relationships in the weld heat-affected zone of duplex stainless steels /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487777170406281.

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29

Lai, Libang. "Low temperature embrittlement of duplex stainless steels : A study of alloying elements’ effect." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-289565.

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Duplex stainless steels (DSSs), consisting of an equal amount of ferrite and austenite phases, have wide applications in e.g. vehicles, chemical engineering as well as nuclear plant because of the combination of excellent mechanical properties and corrosion resistance. However, low temperature embrittlement has existed for a few decades restricting the application of DSSs over about 250 ºC. When the service temperature ranges from around 250 to 500 °C, DSSs would become brittle because of the phase separation in the ferrite phase. The phase separation is the main reason fo

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30

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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31

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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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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33

Wessman, Sten. "Applications of Computational Thermodynamics and Kinetics on Transformations in Stainless Steels." Doctoral thesis, KTH, Skolan för industriell teknik och management (ITM), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-121337.

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Stainless steels are high-alloyed, usually with multiple components and often also dual matrix phases, as for duplex stainless steels. This make predictions and calculations of alloying effects on equilibria and transformations complicated. Computational thermodynamics has emerged as an indispensable tool for calculations within these complex systems with predictions of equilibria and precipitation of phases. This thesis offers examples illustrating how computational methods can be applied both to thermodynamics, kinetics and coarsening of stainless steels in order to predict microstructure an

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34

Ali, Rastee Dalshad [Verfasser], and Uwe [Akademischer Betreuer] Heisel. "Modeling and optimization of turning duplex stainless steels / Rastee Dalshad Ali. Betreuer: Uwe Heisel." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2015. http://d-nb.info/1072623951/34.

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35

Femenia, Marc. "Corrosion Behavior of Duplex Stainless Steels in Acidic-Chloride Solutions Studied with Micrometer Resolution." Doctoral thesis, KTH, Materials Science and Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3484.

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<p>The local corrosion behavior of duplex stainless steel (DSS)is affected by a wide variety of factors. Localized corrosionof DSS frequently starts at micrometer scale inclusions orprecipitates, which are often segregated in theaustenite-ferrite boundary regions. Moreover, due to thepartitioning of the key alloying elements of ferrite (Cr andMo) and austenite (N and Ni), the local interactions betweenthe phases must also be considered.</p><p>The aim of this doctoral study was to increase the knowledgeabout the local dissolution behavior of DSS in acidic-chlorideenvironments. The recent develo

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Gunn, Robert Neil. "The effect of thermal cycles on the microstructure and toughness of superduplex stainless steels." Thesis, Imperial College London, 1999. http://hdl.handle.net/10044/1/8418.

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Edling, Erika, Malin Börjesson, Niklas Rogeman, et al. "Rostfritt stål till stora vattentankar utomhus : En jämförelse mellan austenitiska och rostfria stål." Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-175408.

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The austenitic stainless steel 316L has been compared to duplex stainless steels to be able to highlight a choice of material for manufacturing of spare tanks used for cooling water at nuclear power stations on the Swedish west coast. In this report 316L and the duplex stainless steels 2205, 2304 and LDX 2404 have been compared according to corrosion resistance, strength, manufacturing aspects and prices. The steels arranged by increasing corrosion resistance: 316L < 2304 < LDX 2404 < 2205. The steels arranged by increasing strength (considering the thickness of the plates needed for

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Aribo, Sunday. "Corrosion and erosion-corrosion behaviour of lean duplex stainless steels in marine and oilfield environments." Thesis, University of Leeds, 2014. http://etheses.whiterose.ac.uk/7170/.

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Lean duplex stainless steels are becoming attractive for applications in oilfield and marine environments due to their economic advantages, very good mechanical properties and relatively good corrosion resistance. One such application is in the production of the carcass of flexible pipes. However, materials selection for such oilfield applications becomes more complex as a result of the interactions between corrosion and erosion. Much effort has been directed towards the study of erosion-corrosion behaviour of carbon steels and other passive alloys. However, the subject of erosion-corrosion of

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Bhogireddy, Venkata Sai Pavan Kumar. "Phase Field modeling of sigma phase transformation in duplex stainless steels : Using FiPy-Finite Volume PDE solver." Thesis, KTH, Materialvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-161712.

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Duplex Stainless Steels (DSS) are used extensively in various industrial applications where the properties of both austenite and ferrite steels are required. Higher mechanical strength and superior corrosion resistance are the advantages of DSS. One of the main drawbacks for Duplex steels is precipitation of sigma phase and other intermetallic phases adversely affecting the mechanical strength and the corrosion behavior of the steels. The precipitation of these secondary phases and the associated brittleness can be due to improper heat treatment. The instability in the microstructure of Duplex

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40

Samih, Youssef. "Thermomechanical surface treatments of austenitic stainless steels and their effects on subsequent nitriding during “Duplex” treatments." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0100/document.

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L’optimisation des microstructures de surface est un facteur primordial pour améliorer les propriétés et la durée de vie des matériaux. Pour le traitement des aciers inoxydables, la nitruration est un procédé adéquat permettant l’augmentation de la dureté et de la résistance à l’usure par formation d’une austénite «expansée» sursaturée en azote. Des travaux récents ont suggéré que l’activation de surface par un traitement mécanique préalable permettait d’augmenter les cinétiques de diffusion de l’azote. Avec des traitements « duplex » de ce type, il doit donc être possible (i) d’augmenter l’ép

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Menezes, John Winston Abitibol. "AnÃlise Quantitativa da Fase FerrÃtica do AÃo inoxidÃvel Duplex UNS S3 1803 na CondiÃÃo Soldada." Universidade Federal do CearÃ, 2005. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=7367.

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Em geral, os requisitos essenciais exigidos para uma liga metÃlica utilizada em atividades ligadas Ã industria petroquÃmica sÃo resistÃncia mecÃnica, tendo em vista os diversos esforÃos aos quais os materiais serÃo submetidos, e resistÃncia Ã corrosÃo, devido a severidade ambiental ao qual os materiais serÃo expostos. O aÃo inoxidÃvel duplex (AID) vem conquistando cada vez mais espaÃo no setor petroquÃmico justamente por possuir tais requisitos citados acima. Atribuem-se suas altas resistÃncias Ã corrosÃo e mecÃnica Ã sua microestrutura balanceada em aproximadamente 50% de ferrita e 50% de aus

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42

Da, Silva Craidy Pedro. "Interactions Hydrogène-Microstructure-Propriétés Mécaniques dans les Composants en Acier Inoxydable Super Suplex." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAI041.

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La demande croissante en énergie nécessite l'exploration de pétrole et de gaz dans des conditions plus difficiles. Ces systèmes de production exigent l'utilisation d'équipements forgés faits de nuances d'acier de plus haute résistance, comme les aciers inoxydables austéno-ferritiques (duplex). Ces composants tendent à présenter une perte de ductilité et de performance mécanique générale provoquée par l'hydrogène produit par p. ex. des systèmes de protection cathodique et des processus de corrosion. Les composants en aciers inoxydables duplex présentent une longue histoire d’endommagement par l

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43

Lin, Sen. "Deformation-Induced Martensitic Transformation and Mechanical Properties of Duplex and Austenitic Stainless Steels : A Synchrotron X-Ray Diffraction Study." Thesis, KTH, Metallografi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-233334.

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Metastable austenitic and duplex stainless steels are widely used materials in industrial anddomestic applications, owing to their attractive characteristics such as good corrosion resistanceand favorable mechanical properties. Both types of steel experience enhanced mechanicalproperties during plastic deformation due to the formation of the martensite phase from theparent austenite phase, this is called deformation-induced martensitic transformation (DIMT).It is therefore of technical interest to study the transformation mechanism and its impact onmechanical properties for a better understand

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FONTES, TALITA F. "Efeito da fase alfa linha nas propriedades mecanicas e de resistencia a corrosao do aco inoxidavel duplex UR 52N+." reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9448.

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Made available in DSpace on 2014-10-09T12:26:53Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:00:37Z (GMT). No. of bitstreams: 0<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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Poinsot, Jocelin. "Influence des éléments cuivre et tungstène sur les mécanismes de corrosion localisée des super-duplex." Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCK013.

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Les aciers inoxydables super-duplex (SDSS) sont des matériaux d’ingénierie intéressants, du fait de leur structure biphasé qui leur confère généralement une grande résistance à la corrosion combinée à une haute résistance mécanique. Ils sont utilisés dans de nombreux secteurs industriels, tels que l’oil & gas (pipelines et réservoirs de stockage), le dessalement (évaporateurs et pompes), la géothermie, la dépollution (épurateur) et l’industrie des pâtes et papiers (digesteurs et réacteurs de blanchissement).Dans cette thèse, l’influence de l’addition de cuivre et de tungstène dans les SDSS

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Andersen, Kjetil. "HISC in Super Duplex Stainless Steels : A study of the relation between microstructure and susceptibility to hydrogen induced stress cracking." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22418.

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Testing of susceptibility to hydrogen induced stress cracking (HISC) in two 25% Cr Super Duplex Stainless Steels (SDSS) has been carried out. These were a forged material and a hot isostatically pressed (HIP) material with austenite spacing 51.5 µm and 12.9 µm, respectively. The tests were carried out on both smooth and notched samples by stepwise increasing load in Cortest proof rings on hydrogen pre-charged samples until fracture. The fracture surfaces were examined in scanning electron microscopes (SEM) and the hydrogen contents were measured. The microstructures of the materials

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McCusker, Peter Michael. "Aspects of the repassivation kinetics of a range of duplex and austenitic stainless steels in acidic and neutral chloride environments." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303257.

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GOMES, ANA PAULA SILVA. "EFFECT OF N2 ADDITION ON THE GAS PROTECTION FOR AUTOGENOUS AND NI-CONTAINING WELD METAL WELDING OF DUPLEX STAINLESS STEELS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35991@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO<br>PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTITUIÇÕES COMUNITÁRIAS DE ENSINO PARTICULARES<br>Os aços inoxidáveis duplex (AID) são uma classe de aços que combinam a alta resistência mecânica da ferrita e a ductilidade da austenita possuindo alto limite de escoamento e resistência à corrosão, sendo empregados em meios corrosivos com solicitações mecânicas elevadas. As boas propriedades mecânicas e de resistência à corrosão

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Zhou, Jing. "Experimental study of phase separation in Fe-Cr based alloys." Licentiate thesis, KTH, Metallografi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-119230.

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Duplex stainless steels (DSSs) are important engineering materials due to their combination of good mechanical properties and corrosion resistance. However, as a consequence of their ferrite content, DSSs are sensitive to the so-called ‘475°C embrittlement’, which is induced by phase separation, namely, the ferrite decomposed into Fe-rich ferrite (α) and Cr-rich ferrite (α'), respectively. The phase separation is accompanied with a severe loss of toughness. Thus, the ‘475°C embrittlement’ phenomenon limits DSSs’ upper service temperature to around 250°C. In the present work, Fe-Cr binary model

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Naser, Hasan. "Développement de micro-composites architecturés en aciers inoxydables duplex : élaboration, microstructure et propriétés mécaniques." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI024/document.

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L'utilisation de l'acier inoxydable duplex (DSS) pour des applications structurales est considérée comme l'un des progrès les plus notables et qui a le plus grand impact sur le secteur de la construction. Ceci est grâce à ses propriétés mécaniques élevées couplées avec des propriétés fonctionnelles intéressantes telles que la résistance à la corrosion, ou encore la faible conductivité thermique par rapport aux aciers au carbone. En raison de sa microstructure et l'interaction complexe entre les phases, DSS a un fort potentiel pour le développement des propriétés uniques. Une meilleure compréhe

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