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Open AccessArticle

In Situ Determination of Phase Stress States in an Unstable Medium Manganese Duplex Steel Studied by High-Energy X-ray Diffraction

1
Institut Jean Lamour, UMR CNRS UL 7198, Campus Artem, 2 allée André Guinier, 54000 Nancy, France
2
ArcelorMittal Maizières Research SA, Products Research Center, Voie Romaine, 57280 Maizières-lès-Metz, France
*
Author to whom correspondence should be addressed.
Metals 2020, 10(10), 1335; https://doi.org/10.3390/met10101335
Received: 10 September 2020 / Revised: 1 October 2020 / Accepted: 3 October 2020 / Published: 6 October 2020
(This article belongs to the Special Issue Advanced Multiphase Steels)
Duplex medium Mn steels are high-potential advanced high-strength steels (AHSS) for automotive construction. Their excellent forming properties stem from the specific stress partitioning between their constituting phases during deformation, namely the ferritic matrix, unstable retained austenite, and strain-induced fresh martensite. The stability of the retained austenite and the 3D stress tensors of each phase are determined simultaneously in this work by in situ high energy X-ray diffraction on synchrotron beamline during a tensile test. The role of internal stresses inherited from the manufacturing stage are highlighted for the first time as well as new insights to understand the origin of the serrations shown by these alloys. View Full-Text
Keywords: steel; austenite; martensite; internal stresses; synchrotron; TRIP steel; austenite; martensite; internal stresses; synchrotron; TRIP
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Lamari, M.; Allain, S.Y.P.; Geandier, G.; Hell, J.-C.; Perlade, A.; Zhu, K. In Situ Determination of Phase Stress States in an Unstable Medium Manganese Duplex Steel Studied by High-Energy X-ray Diffraction. Metals 2020, 10, 1335.

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