Near-A_c3 austenitized ultra-fine-grained quenching and partitioning (Q&P) steel

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• 作者：Lawrence Cho ; Eun Jung Seo ; Bruno C. De Cooman ; ^{decooman@postech.ac.kr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Quenching and partitioning ; Medium Mn steel ; Ultra-fine grain
• 刊名：Scripta Materialia
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：123
• 期：Complete
• 页码：69-72
• 全文大小：1365 K

文摘

The influence of an intercritical anneal and a full austenitizing close to the A_c3 temperature on the mechanical properties of a quenching and partitioning (Q&P) processed medium Mn steel is reported. This approach to Q&P processing is shown to result in significantly improved mechanical properties mainly due to a refinement of the prior austenite grain size and, in consequence, the refinement of the lath martensite packet size after Q&P processing. Deformation twinning and strain-induced martensitic transformation were activated during tensile deformation. This resulted in a clear plasticity enhancement in the ultra-fine grained austenite islands after Q&P processing combined with austenitizing near the A_c3 temperature.