焼なましベイナイトラス組織を母相とするAl添加低合金TRIP鋼板の微細組織と成形性に及ぼす冷延率の影響

概要

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The effects of cold-rolling strain on microstructure and formability of 0.2%C–0.5–1.5%Si–1.5%Mn–0.04–1.0%Al, in mass%, TRIP-aided cold-rolled sheet steels with annealed bainitic lath structure matrix (TAB steels) were investigated. Cold rolling straining changed the matrix structure after intercritical annealing from annealed bainitic lath structure to granular structure with a change of retained austenite morphology, if the structure before cold-rolling was changed to bainitic lath structure. Both the largest elongation and the best stretch-flangeability were achieved in 1.0% Al bearing TAB steel subjected to cold-rolling strain of 40%, followed by intercritical annealing and austempering. This was caused by the increased retained austenite stability and the remained bainitic lath structure due to Al addition.
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