Crystallographic features of theγ-to-α transformation in a Nb-added transformation-induced plasticity steel |
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| Authors: | Youliang He John J. Jonas Stéphane Godet Pascal J. Jacques |
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| Affiliation: | (1) Present address: Department of Materials Engineering, McGill University, Canada;(2) Sibley School of Mechanical and Aerospace Engineering, Cornell University, 14853 Ithaca, NY;(3) the Department of Materials Engineering, McGill University, H3A 2B2 Montreal, PQ, Canada;(4) Département des Sciences des Matériaux et des Procédés-IMAP, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium |
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| Abstract: | A Nb-bearing transformation-induced plasticity (TRIP) steel was control rolled and a certain amount of austenite was retained through appropriate heat treatment. Electron backscatter diffraction (EBSD) measurements were conducted on specimens deformed to various reductions, and the orientations of theα grains formed within individual prior-austenite grains were compared to those expected from the common correspondence relationships. While most of the bainite orientations cluster around the Bain circles formed by these relations, the polygonal (allotriomorphic) ferrite formed at the austenite grain boundaries does not obey any of these relations with respect to the neighboring austenite orientations. Grain-scale variant selection was observed in both the deformed and undeformed austenite grains. The crystallographic features of the deformation-induced ferrite transformation are also discussed. |
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