Micromechanical Behavior and Failure Mechanism of F/B Multi-phase High Performance Steel

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• 作者：Cun-jiang TANG ^{tangcunjiang@163.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Shi-long LIU ; Cheng-jia SHANG ; ^{cjshang@ustb.edu.en" class="auth_mail" title="E-mail the corresponding author}
• 关键词：ferrite/bainite multi-phase steel ; numerical simulation ; ferrite/bainite interface ; micro-strain ; microvoid ; failure mechanism ; soft phase
• 刊名：Journal of Iron and Steel Research, International
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：23
• 期：5
• 页码：489-494
• 全文大小：1939 K

文摘

The deformation and micro-voids formation mechanisms in ferrite/bainite (F/B) multi-phase steel with the volume fraction of bainite less than 50% were studied by numerical simulation and experimental observation. The results show that the micro-strain concentrates at the soft/hard phase (F/B) interface in the multi-phase steel, which should be correlated with the mechanism of incoordinate deformation. During the necking of the steel, the micro-voids initially form around the F/B interface, which also form in ferrite and bainite with the severe strain. The micro-voids in bainite are more dense and finer than those in ferrite. The failure mechanism of bainite is the coalescence of micro-voids, and the failure mechanism of ferrite is the growth and tearing of micro-voids. Due to the different failure mechanisms of ferrite and bainite, a suitable part of soft phase would be beneficial to the capability of anti-failure of F/B multi-phase steel during the ductile fracture.