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Dissertations / Theses on the topic 'Duplex stainless steel Corrosion'

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Published: 4 June 2021

Last updated: 14 February 2022

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

Martins, Marcelo. "Caracterização microestrutural-mecânica e resistência à corrosão do aço inoxidável super duplex ASTM A890 / A890M grau 6A." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-25102007-152307/.

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Este trabalho foi desenvolvido com o intuito principal de adquirir \"know how\" na fabricação de componentes fundidos e usinados de bombas centrífugas, para aplicações em plataformas \"offshore\". Os materiais utilizados para esse destino - aços inoxidáveis super duplex - constituem sistemas termodinamicamente meta estáveis, que buscam o estado de estabilidade termodinâmica quando excitados termicamente. Por outro lado, esses materiais apresentam uma grande instabilidade dimensional, devido às tensões residuais desenvolvidas no resfriamento do tratamento térmico e durante o processo de usinage

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12

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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13

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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14

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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15

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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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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16

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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17

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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18

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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19

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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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

David, Charles. "Influence de la déformation plastique sur la résistance à la corrosion de l'acier inoxydable lean duplex UNS S32304." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAI026/document.

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Les aciers inoxydables lean duplex sont des alliages de fer, de chrome et de nickel dans lesquels coexistent deux phases cristallographiques (austénite - γ et ferrite - α). Ces aciers présentent de très bonnes propriétés mécaniques et de résistance à la corrosion, et trouvent leurs principales applications dans les domaines de l’exploration pétrolière offshore et du dessalement de l’eau de mer. Malgré ces excellentes propriétés, l’influence de la déformation plastique induite par les procédés de mise en forme sur la résistance à la corrosion de ces matériaux est encore peu comprise, et peut co

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22

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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23

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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24

Amaro, Lucinda Oliveira. "Estudo da resistÃncia Ã corrosÃo do aÃo inoxidÃvel duplex UNS S31803 OU SAF 2205 submetido a processo de soldagem." Universidade Federal do CearÃ, 2006. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=3196.

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CoordenaÃÃo de AperfeiÃoamento de NÃvel Superior<br>Este trabalho objetiva estudar a influÃncia da energia de soldagem na resistÃncia Ã corrosÃo do aÃo inoxidÃvel duplex UNS S31803 ou SAF 2205. Para isto foi avaliada a susceptibilidade do material soldado Ã corrosÃo intergranular e por pite e sua relaÃÃo com a microestrutura da zona afetada termicamente pelo calor durante o processo de soldagem. Foram tambÃm avaliadas a microdureza e a quantificaÃÃo de fases para correlacionÃ-los com a microestrutura. As tÃcnicas eletroquÃmicas utilizadas neste estudo foram a de reativaÃÃo e a de polarizaÃÃo

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25

Hussain, Essam A. M. "An electrochemical investigation of erosion corrosion of duplex stainless steel in sea water containing sand particles." Thesis, Cranfield University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393705.

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26

Hosseini, Vahid. "Influence of multiple welding cycles on microstructure and corrosion resistance of a super duplex stainless steel." Licentiate thesis, Högskolan Väst, Avdelningen för svetsteknologi (SV), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-10151.

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Super duplex stainless steel (SDSS) has found a wide use in demanding applications such as offshore, chemical and petrochemical industries thanks to its excellent combination of mechanical properties and corrosion resistance. Welding of SDSS, however, is associated with the risk of precipitation of secondary phases and formation of excessive amounts of ferrite in the weld metal and heat affected zone. The present study was therefore aimed at gaining knowledge about the effect of multiple welding thermal cycles on the microstructure and possible sensitization to corrosion of welds in SDSS.Contr

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27

Oliveira, Junior Carlos Ancelmo 1981. "Torneamento do aço inoxidável super duplex UNS S32750 e influência na resistência à corrosão." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264188.

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Orientador: Anselmo Eduardo Diniz<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica<br>Made available in DSpace on 2018-08-22T09:27:39Z (GMT). No. of bitstreams: 1 OliveiraJunior_CarlosAncelmo_M.pdf: 7354499 bytes, checksum: 05a6c099baa7c4f194f916c8e418d4db (MD5) Previous issue date: 2013<br>Resumo: Os aços inoxidáveis super duplex são ligas extremamente resistentes à corrosão, desenvolvidas para aplicações com altos níveis de exigência, em que as peças terão contato com ambientes corrosivos como a água do mar, por exemplo. Devido à sua composiçã

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28

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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29

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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30

Baxter, David Paul. "Investigation of a brittle cleavage fracture mode during fatigue crack propagation in a duplex stainless steel." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388383.

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31

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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32

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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33

Næss, Monika. "EFFECT OF MICROSTRUCTURE AND SURFACE FINISH ON LOCALIZED CORROSION PERFORMANCE OF SUPER DUPLEX STAINLESS STEEL IN SEAWATER." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for produksjons- og kvalitetsteknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-25741.

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Corrosion resistant alloys (CRAs) used in subsea pressure-retaining components must be compatible with production fluids and resistant to pitting and crevice corrosion in seawater. Whereas materials selection in production environments is governed by well-established international standards such as ISO 15156, much debate still exists as of how to determine the seawater localized corrosion resistance of higher grade CRAs such as duplex super duplex stainless steels (DSS and SDSS, respectively). While most industry specifications rely on the ASTM G48 standard to determine localized corrosion res

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GirÃo, Daniel de Castro. "Influence of sigma phase in the corrosion resistance of super duplex stainless steel ASTM A890 grade 1C after isothermal treatment." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15245.

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The super duplex stainless steels are often used in applications where high mechanical strength is required, combined with corrosion resistance, especially in highly aggressive environments. However, when certain manufacturing processes are involved (hot forming or welding, for example) can occur the precipitation of undesirable phases, causing reduction of both mechanical properties as well as corrosion resistance. Particularly between 700 and 900 ÂC may occur sigma phase formation. This phase is responsible for the reduction of corrosion and mechanical resistance of super duplex steels. Thro

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Westin, Elin M. "Welds in the lean duplex stainless steel LDX 2101 : effect of microstructure and weld oxide on corrosion properties." Licentiate thesis, KTH, Materials Science and Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9299.

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<p>Duplex stainless steels are a very attractive alternative to austenitic grades due to their higher strength and good corrosion performance. The austenitic grades can often be welded autogenously, while the duplex grades normally require addition of filler metal. This is to counteract segregation of important alloying elements and to give sufficient austenite formation to prevent precipitation of chromium nitrides that could have a negative effect on impact toughness and pitting resistance. The corrosion performance of the recently-developed lean duplex stainless steel LDX 2101 is higher tha

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Westin, Elin M. "Welds in the lean duplex stainless steel LDX 2101 : effect of microstructure and weld oxides on corrosion properties." Licentiate thesis, Stockholm : Industriell teknik och management, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9299.

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Nascimento, Alex Maia do. "Mudanças microestruturais e resistencia a corrosão de aços inoxidaveis duplex apos tratamentos superficiais por refusão a laser." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263603.

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Orientador: Maria Clara Filippini Ierardi<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-08-05T03:30:54Z (GMT). No. of bitstreams: 1 Nascimento_AlexMaiado_M.pdf: 9829466 bytes, checksum: 78b8c487039e438993230c1c4d52544c (MD5) Previous issue date: 2005<br>Resumo: Neste trabalho procurou-se observar as mudanças microestruturais e os efeitos na resistência à corrosão dos aços inoxidáveis duplex UNS S32304 e S32205, bastante utilizados pela indústria petrolífera, após realização de tratamentos superficiais por r

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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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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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40

Lasebikan, B. A. "Mechanical behaviour and stress corrosion cracking of super duplex stainless steel pipes in high pressure and high temperature environment." Thesis, University of Aberdeen, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540314.

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The oil and gas industry is constantly looking at ways to keep costs down in high temperature and high pressure (HPHT) well completions. The use of duplex or super duplex stainless steel (DSS or SDSS) for production tubing rather than high alloy (austenitics or nickel based) steels is one way to achieve this. An effective use of DSS or SDSS requires an understanding of the effects of environmental and metallurgical variables on the general and localised corrosion behaviour and resistance to environment assisted cracking (EAC) in HPHT well conditions. This research investigates the behaviour of

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Gideon, Abdullah Mohammed Abdul Fatah, and barrygideon@hotmail com. "Structural Characterisation, Residual Stress Determination and Degree of Sensitisation of Duplex Stainless Steel Welds." RMIT University. Civil, Environmental and Chemical Engineering, 2009. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20091110.101453.

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Welding of duplex stainless steel pipeline material for the oil and gas industry is now common practice. To date, research has been conducted primarily on the parent material and heat affected zones in terms of its susceptibility to various forms of corrosion. However, there has been little research conducted on the degree of sensitisation of the various successive weld layers, namely the root, fill and cap layers. The focus of this research study was to: (i) provide an in-depth microstructural analysis of the various weld passes, (ii) study the mechanical properties of the weld regions; (ii

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Ruel, Fiona. "Contribution électrochimique à l’étude de la corrosion sous contrainte des aciers inoxydables lean duplex en milieu purement chloruré et sous présence de sulfure d’hydrogène." Thesis, Saint-Etienne, EMSE, 2014. http://www.theses.fr/2014EMSE0743/document.

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Les aciers inoxydables lean duplex, à faible teneur en nickel et sans molybdène, représentent une alternative économique pour les usines de dessalement et l’industrie pétrolière. Celles-ci ont la particularité d’être exposées à des milieux très agressifs dont la présence de chlorure, de sulfure d’hydrogène, de hautes températures ou encore d’acides peut provoquer des phénomènes de fissuration sous contrainte.Cette étude est divisée en deux parties, la première se consacre aux milieux purement chlorurés et la seconde aux milieux contenant du sulfure d’hydrogène. Dans les deux parties, la compré

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Leite, Antonio Marcos dos Santos. "Investigação da resistência à corrosão por pites do aço inoxidável duplex tipo 2404 (UNS S82441) submetido à soldagem por atrito com pino não-consumível (FSW)." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-06092017-095305/.

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Os aços inoxidáveis duplex são largamente utilizados na fabricação de equipamentos para a indústria de óleo e gás, utilizados tanto no ambiente onshore quanto offshore. Sua grande limitação é que, com o aumento de temperatura, ocorre precipitação de fases indesejáveis, que reduzem drasticamente a resistência à corrosão e as propriedades mecânicas desses materiais. Considerando o efeito deletério da soldagem a fusão nos aços inoxidáveis duplex, a soldagem por atrito com pino não-consumível (FSW) é amplamente considerada como alternativa aos processos convencionais. Como no FSW a união dos mater

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Oliveira, Caroliny Gomes de. "Assessment of susceptibility corrosion of stainless steel super duplex UNS S32750 (SAF 2507) AND UNS S32760 (ZERON100) using a EPR portable cell." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13348.

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CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel Superior<br>The great demand for techniques that can detect and determine the degree of susceptibility to corrosion motivated thedevelopment of a research project that resulted in the construction of a portable electrochemical cell that has been validated according to ASTM A262. The success of this technique for nondestructive evaluation has motivated the expansion of this technique to other materials and phenomena of precipitation. In this work it was evaluated the use of this EPR-DL portable cell used applied for assessing the susceptibility

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Nejedlý, Zdeněk. "Mechanické a technologické vlastnosti duplexních ocelí v závislosti na hodnotě PREN." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231634.

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This thesis deals with stainless austenitic-ferritic (duplex) steels and their mechanical and technological properties. The first part focuses on introducing these high-alloy materials. The second part describes the influence of chemical composition on the mechanical properties, technological properties and steel structure. There was also observed the effect of heat treatment and steel melting under reduced pressure.

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Sawczen, Tiago. "Caracterização eletroquímica e proposta de metodologia para a determinação da temperatura crítica de pite de aços inoxidáveis super duplex UNS S32760." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/46/46136/tde-30092014-113605/.

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O Aço Inoxidável Super Duplex UNS S32760 é um aço de alta liga com estrutura composta por uma matriz ferrítica com ilhas austeníticas, em proporções aproximadamente iguais. Esta estrutura lhe confere boas propriedades como: resistência à corrosão, em particular à corrosão por pite e por fresta, excelentes propriedades mecânicas, boa soldabilidade, alta condutividade térmica, baixo coeficiente de expansão térmica e excelente tenacidade. Suas principais aplicações geralmente ocorrem em ambientes com alta concentração de cloreto, como por exemplo, em tubos para transporte de óleo e gás, equipamen

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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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Jafari, Khadijeh. "A comparative study on twostandardised electrochemicalmethods with emphasis the effectof microstructure and inclusionson pitting corrosion on duplexstainless steel." Thesis, KTH, Materialvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-191170.

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Duplex stainless steel (DSS) that developed in the 1930’s is a type of steel that consists of bothaustenite and ferrite phases in an almost equal proportion. It inherits properties of both ferriticand austenitic stainless steel and so it has good mechanical and corrosion resistance propertiesthat makes it suitable material in different industries with aggressive environment. There aredifferent approaches that used to evaluate the susceptibility of stainless steels to pitting corrosionlike Pitting Resistance Equivalent Number (PREN) and electrochemical methodologies. In thisstudy, focus is on t

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Silva, Samuel Deoteronio da. "Efeito do tratamento térmico pós-soldagem no comportamento em corrosão e nas propriedades mecânicas do aço inoxidável duplex UNS S32304." Universidade Federal do Espírito Santo, 2010. http://repositorio.ufes.br/handle/10/6247.

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Made available in DSpace on 2016-12-23T14:08:13Z (GMT). No. of bitstreams: 1 Samuel Deoteronio da Silva - parte 1.pdf: 1190958 bytes, checksum: 08460415eb12294aa05f2834b78651da (MD5) Previous issue date: 2010-08-31<br>Foram avaliadas a microestrutura, propriedades mecânicas e a resistência a corrosão de juntas soldadas de aço inoxidável duplex UNS S32304, submetidas a diferentes Tratamentos Térmicos Pós-Soldagem (TTPS). Fitas de aço inoxidável duplex UNS S32304, com 72 mm de largura e 1,8 mm de espessura, foram soldados pelo processo GTAW Gas Tungsten Arc Welding com corrente pulsada e sem

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Gogola, Eliane Engel. "Estudo da corrosão dos aços AISI 1020, 304L, 316L e duplex SAF 2205 em planta do tratamento de efluentes em indústria de celulose e papel." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2014. http://tede2.uepg.br/jspui/handle/prefix/1457.

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Made available in DSpace on 2017-07-21T20:42:46Z (GMT). No. of bitstreams: 1 Eliane Engel Gogola.pdf: 5376053 bytes, checksum: d9613bf1e372ef92965596e2136c6891 (MD5) Previous issue date: 2014-08-28<br>In this work were studied of the chemical product’s influence once used through the membrane’s cleaning process of the ultrafiltration plant in the effluent treatment station, in a pulp and paper company, located in Paraná State – Brazil on the corrosive process presented in the plant. It was determined the electrochemical parameters through electrochemical methods, according to the norm ASTM G

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