Influence of the Martensitic Transformation on the Microscale Plastic Strain Heterogeneities in a Duplex Stainless Steel
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plex stainless steels (DSSs) consist of a two-phase microstructure involving ferrite and austenite in equal proportion (~50 to 50 pct). These alloys are characterized by a good combination of strength and toughness together with excellent corrosion resistance.[1] They have substituted the conventional austenitic stainless steel in various applications, in particular in the construction industry.
AUDREY LECHARTIER, Ph.D. Student, and MARC MANTEL, Engineer R&D, are with Universite´ Grenoble Alpes, SIMAP, 38000 Grenoble, France, and with CNRS, SIMAP, 38000 Grenoble, France, and also with UGITECH, 74403 Ugine Cedex, France. GUILHEM MARTIN, Associate Professor, SOLE`NE COMBY, Ph.D. Student, ALEXIS DESCHAMPS, Professor, MARC VERDIER, Researcher, and MURIEL VERON, Professor, are with Universite´ Grenoble Alpes, SIMAP, 38000 Grenoble, France, and also with CNRS, SIMAP. Contact e-mail: [email protected] FRANCINE ROUSSEL-DHERBEY, Research Engineer, is with Grenoble-INP, CMTC, BP 46, 38402 Saint Martin d H`eres Cedex, France. NICOLAS MEYER, Engineer R&D, is with UGITECH. Manuscript submitted May 18, 2016. METALLURGICAL AND MATERIALS TRANSACTIONS A
New DSS grades have been recently developed by utilizing the transformation-induced plasticity (TRIP) effect, see e.g., References 2 through 7. The alloy design strategy was to achieve the right level of austenite stability to undergo a TRIP effect, and to ensure that it occurs over a large strain range. DSSs exhibiting a TRIP effect open new avenues to higher ultimate strength and total elongation in comparison to commercial lean DSS such as the 1.4362 grade. Quantitative measurements of plastic strain partitioning at the microstructural scale in dual phase steels has received a great interest.[8–14] The strain partitioning was related to martensite that exhibits a much higher hardness compared to ferrite. The effect of the ferrite grain size, martensite fraction, distribution, and morphology on the strain partitioning of dual-phase steels has been recently investigated.[13,15] Strain partitioning has also been measured in a limited number of studies in conventional DSSs at ambient [16,17] and at high temperature.[18–20] However, characterization of strain heterogeneity in DSSs showing a TRIP effect has been so far limited to interpretations based on electron back-scattered diffraction (EBSD), where local misorientation and pattern quality have been used to infer regions of low and high plastic strains.[2,3] However, the understanding of the complex plasticity mechanisms in TRIP DSSs would strongly benefit from a more detailed characterization of the strain partitioning at the microstructural level, together with the knowledge of the phase transformation that occurs during plastic straining. In this work, the influence of the TRIP effect on the partitioning of plastic strain is investigated by coupling microscopic in situ strain mapping with an in situ measurement of phase fractions. The local strain fields are determined at the microscopic scale with an intraphase resolut
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