Deformation behavior and microstructure/texture evolution of an annealed 304 AISI stainless steel sheet. Experimental and micromechanical modeling |
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Authors: | B Petit N Gey M Cherkaoui B Bolle M Humbert |
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Institution: | 1. LETAM CNRS, University of Metz, Ile du Saulcy, F-5704 Metz Cedex, France;2. LPMM CNRS, University of Metz, Ile du Saulcy, F-5704 Metz Cedex, France;3. Georgia Institute of Technology, George W. Woodruff School of Mechanical Engineering, Atlanta, GA 30332-0405, USA |
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Abstract: | Different tensile tests are performed at −60 °C, on a 304 AISI stainless steel, to produce strain induced α′ martensite. Using EBSD analysis and X-ray diffraction methods, the corresponding texture and microstructure evolutions is studied, as well as the γ → α′ transformation mechanism. It is shown that α′ martensite is associated with {1 1 1}γ faulted bands, partially ε bands, as often reported in the literature for low SFE stainless steels. As a consequence, these deformation bands play a key role in the nucleation and growth of α′ martensite. A micromechanical model is applied to simulate the deformation behavior of the stainless steel as well as the corresponding transformation kinetic and γ texture evolution. Different simulations are proposed, using various assumptions for the γ → α′ transformation mechanism. The simulation data are in better agreement with the experimental ones, when the γ → α′ transformation strain is derived from the Bowles–MacKenzie theory using the (1 1 1)γ−1 2 −1]γ stacking fault shear system as lattice invariant shear. |
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Keywords: | 304 Stainless steel EBSD Transformation induced plasticity Micromechanical modeling |
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