Deformation behaviour of lath martensite in multi-phase steels

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• 作者：F. Maresca^a ; ^b ; ^{f.maresca@tue.nl" class="auth_mail" title="E-mail the corresponding author} ; V.G. Kouznetsova^a ; M.G.D. Geers^a
• 关键词：Lath martensite ; Interlath retained austenite ; High strength steels ; Dual phase steels ; Multi-phase steels
• 刊名：Scripta Materialia
• 出版年：2016
• 出版时间：1 January 2016
• 年：2016
• 卷：110
• 期：Complete
• 页码：74-77
• 全文大小：1087 K

文摘

This paper analyses the role of interlath retained austenite films within the martensite islands on the local strain partitioning and overall mechanical response of dual phase steels. A crystal plasticity-based modelling approach is thereby adopted. It is shown that the presence of a negligible (<2%$2\%$) volume fraction of interlath austenite amplifies the strain heterogeneity in both the martensite islands and the surrounding ferrite matrix. This qualitatively matches experimental observations from literature, showing a highly anisotropic, orientation dependent local mechanical response of martensite. The results emphasise the potential key role played by interlath austenite films in microstructures involving lath martensite.