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本文利用EBSD技术研究了高锰钢压缩形变过程中γ→ε→α′马氏体相变的晶体学特点,分析了奥氏体孪生与奥氏体晶粒取向对相变的影响.结果表明,由于α′马氏体在2个ε变体的交叉处形成,而ε相变区域普遍存在奥氏体形变孪晶并且ε可在孪晶界上形成,因此孪生对相变起着重要的作用;而孪生的难易受奥氏体取向的影响.分析认为,低指数的{100},{111}和{110}奥氏体内因多变体同时孪生而比高指数取向容易促进ε变体间的交叉从而促进α′的形成;形变使ε变体数目或新取向增多,但小尺寸的ε难以促进α′的形成.
In this paper, by using EBSD technique, the crystallographic characteristics of γ → ε → α martensite transformation during compression deformation of high manganese steel were studied and the influence of the grain orientation of austenite twin and austenite on the phase transformation was analyzed. , The twin is important for the phase transition since α ’martensite is formed at the intersection of two ε variants and austenite deformation twins are prevalent in the ε phase change region and ε can form on the twin boundaries , While the twin is hard to be affected by the orientation of austenite.The analysis shows that the low exponential {100}, {111} and {110} austenite twinned more easily than the high exponential orientation, The crossover between bodies promotes the formation of α ’. The deformation increases the number of ε variants or the new orientation, but the small size ε hardly promotes the formation of α’.