Critical role of strain partitioning and deformation twinning on cracking phenomenon occurring during cold rolling of two duplex medium manganese steels

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• 作者：Binhan Sun^a ; ^{binhan.sun@mail.mcgill.ca} ; Fateh Fazeli^b ; Colin Scott^b ; Xiaojun Yan^c ; Zhiwei Liu^c ; Xiaoyu Qin^c ; Stephen Yue^a
• 关键词：Rolling ; Medium Mn steels ; Twinning ; Martensitic phase transformation ; Strain partitioning
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：130
• 期：Complete
• 页码：49-53
• 全文大小：1046 K
• 卷排序：130

文摘

Two ferrite-austenite duplex medium manganese steels with very similar phase fractions and grain sizes were subjected to cold rolling. The 10Mn steel presented a much better cold rollability compared with the 7Mn steel, which is believed to stem from two critical factors. Firstly, the larger strain partitioning in the 10Mn steel resulted in a less deformation accommodated by the brittle δ-ferrite, which delayed or even inhibited micro-crack formation inside the ferrite phase. Secondly, the deformation twinning activated in the austenite of the 10Mn steel during rolling effectively enhanced the ductility of the austenite-martensite (γ-α′) mixed phase.