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对2种不同成分的高锰TRIP钢(15Mn-4Si-2Al和20Mn-4Si-2Al)热轧后进行热处理实验.结果表明,增加固溶处理的保温时间,可以获得不同的显微组织并提高高锰TRIP钢的强塑积.分析了不同的热处理条件下,2种高Mn钢在拉伸变形过程中加工硬化速率随真应变的变化关系.利用TEM技术研究了高锰TRIP钢中马氏体相变的特点,确定相变途径为γ→ε→α′和γ→α′,鉴别出ε-M和α′-M2种马氏体的组织及形貌特点,确定γ与α′马氏体之间存在K-S取向关系;γ和ε马氏体之间存在S-N(Shoji-Nishiyama)取向关系;ε马氏体与α′马氏体之间存在Burgers取向关系.
Two kinds of high manganese TRIP steels (15Mn-4Si-2Al and 20Mn-4Si-2Al) were hot-rolled after hot-rolling, and the results showed that different microstructures could be obtained by increasing the holding time of solution treatment High plasticity product of high manganese TRIP steel.The relationship between work hardening rate and true strain of two kinds of high Mn steel under different heat treatment conditions was analyzed.The TEM The phase transformation was determined by γ → ε → α ’and γ → α’. The microstructure and morphology of ε-M and α’-M2 martensites were identified, and the relationship between γ and α ’ There is a KS orientation relation between the bodies; there is an SN (Shoji-Nishiyama) orientation relationship between γ and ε martensite; and there is a Burgers orientation relationship between ε martensite and α ’martensite.