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Micromechanics and microstructure evolution during in situ uniaxial tensile loading of TRIP-assisted duplex stainless steels
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
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2018 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 734, p. 281-290Article in journal (Refereed) Published
Abstract [en]

Transformation-induced plasticity (TRIP) assisted duplex stainless steels, with three different stabilities of the austenite phase, were investigated by synchrotron x-ray diffraction characterization during in situ uniaxial tensile loading. The micromechanics and the deformation-induced martensitic transformation (DIMT) in the bulk of the steels were investigated in situ. Furthermore, scanning electron microscopy supplemented the in situ analysis by providing information about the microstructure of annealed and deformed specimens. The dependence of deformation structure on austenite stability is similar to that of single-phase austenitic steels with shear bands and bcc-martensite (α′) generally observed, and blocky α′ is only frequent when the austenite stability is low. These microstructural features, i.e. defect structure and deformation-induced martensite, are correlated with the micro- and macro-mechanics of the steels with elastoplastic load transfer from the weaker phases to the stronger α′, in particular this occurs close to the point of maximum rate of α′ formation. A clear strain-hardening effect from α′ is seen in the most unstable austenite leading to a pronounced TRIP effect. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2018. Vol. 734, p. 281-290
Keywords [en]
Duplex stainless steel, in situ tensile loading, Load partitioning, Micromechanics, Synchrotron x-ray diffraction, TRIP-assisted steel, Austenite, Austenitic transformations, Crystal structure, Deformation, High strength steel, Martensite, Martensitic transformations, Microstructural evolution, Plasticity, Scanning electron microscopy, Strain hardening, Synchrotron radiation, Tensile stress, X ray diffraction, Deformation-induced martensite, In-situ tensile, Micro-structure evolutions, Microstructural features, Synchrotron x ray diffraction, Transformation induced plasticity, TRIP-assisted steels, Loading
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-236692DOI: 10.1016/j.msea.2018.07.040ISI: 000445993900032Scopus ID: 2-s2.0-85050988500OAI: oai:DiVA.org:kth-236692DiVA, id: diva2:1262467
Funder
VINNOVA
Note

Export Date: 22 October 2018; Article; Correspondence Address: Tian, Y.; Department of Materials Science and Engineering, KTH Royal Institute of TechnologySweden; email: yti@kth.se; Funding details: CSC, China Scholarship Council; Funding details: 2i; Funding details: Axelrod Family Foundation; Funding details: VINNOVA; Funding details: Jernkontoret; Funding details: DMR-1332208, BSF, United States-Israel Binational Science Foundation; Funding text: This work was performed within the VINN Excellence Centre Hero-m 2i, financed by VINNOVA , the Swedish Government Agency of Innovation Systems , Swedish Industry and KTH . This work is based upon research conducted at the Cornell High Energy Synchrotron Source (CHESS) which is supported by the United States National Science Foundation under award DMR-1332208 . The authors are grateful to Darren Dale, Margaret Koker, Prasath Babu R, Yan Ma, Fei Huyan, Sven Gutschmidt and Basil Blank for technical assistance, and Jan Y. Jonsson from Outokumpu for providing the materials. Y. Tian would like to express his gratitude to the support from CSC (China Scholarship Council) and Axel Hultgrens foundation. P. Hedström acknowledges the support from Jernkontoret (Swedish Steel Producers’ association). QC 20181112

Available from: 2018-11-12 Created: 2018-11-12 Last updated: 2018-11-12Bibliographically approved

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Tian, YeForsberg, AnnikaHedström, Peter

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