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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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18MnTRIP钢温变形过程中马氏体逆相变行为
DOI: 10.3724/SP.J.1037.2010.00283, PP. 1153-1160
Keywords: 18Mn钢,温变形,TRIP效应,马氏体逆相变
Abstract:
通过相变点测定、相图计算、组织观察、XRD分析及EBSD取向成像技术研究了室温下含两种马氏体及奥氏体的18Mn钢在100-500℃间进行温变形时的组织、相结构变化及马氏体逆相变行为.结果表明,在300℃以上压缩变形时,TRIP效应消失,马氏体减少,出现逆相变;形变加速了扩散型逆相变,bcc马氏体或铁素体以扩散方式转变成奥氏体,奥氏体不需要重新形核;形变使奥氏体出现机械稳定化并出现大尺寸的形变孪晶,抑制了随后冷却过程中的马氏体相变;压缩形变时,最后残留的马氏体多出现在{110}和{100}取向的奥氏体晶粒中.bcc马氏体周围难以观察到hcp马氏体.分析认为,hcp马氏体以切变方式逆相变.
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