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Crystallographic features of the gamma-to-alpha transformation in a Nb-added transformation-induced plasticity steel

par He, Yan;Godet, Stéphane ;Jacques, Patrice;Jonas, J.J.
Référence Metallurgical and materials transactions. A, Physical metallurgy and materials science, 37A, 9, page (2641-2653)
Publication Publié, 2006

Article révisé par les pairs

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Résumé :

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 the a 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