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Abstract：
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The martensite in the alloy matrix undergoes phase transformation after the deformation treatment of cold rolling. Then, the influence of cold rolling reduction on the microstructure of high temperature annealing for high manganese steel used for car lightweight was analyzed by experiments, and the microstructure characteristics of α-M inverse transformation at different annealing temperatures were also tested. The results show that the structure in the matrix of high manganese steel is mainly composed of γ phase grains, and some α-M phases are also formed. When the reduction is up to 70%, the microstructure of alloy significantly refines, and the microstructure formed in the sample arranges in parallel with the rolling direction. At this time, the proportion of γ phase and α-M phase remains basically stable, and the volume ratio of α-M phase reaches about 95%. Then, after thermal insulation treatment for 10 min, the proportion of γ phase reaches almost 100%. However, most cold rolling samples have reverse transformation of martensite after annealing treatment. During the α-M reverse transformation period, when the thermal insulation time increases, the reverse transformation occurs faster, and the proportion of γ phase also increases.
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Funds：
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河南省科技攻关计划项目（182102210553）；河南省教育厅高等学校重点科研项目（20B460016）
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AuthorIntro：
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李伟（1983－），男，硕士，副教授，E-mail：lizhouchuan691450@126.com
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Reference：
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