锻压技术

冷轧压下量对汽车轻量化用高锰钢高温退火组织的影响

英文标题：Influence of cold rolling reduction on microstructure of high temperature annealing for high manganese steel used for car lightweight

作者：李伟王凯

单位：郑州科技学院中国科学院金属研究所

关键词：高锰钢冷轧 α-M 逆转变压下量退火处理

分类号：TG142.33

出版年,卷(期):页码：2019,44(11):164-169

摘要：

经过冷轧变形处理后合金基体中的马氏体发生相变，实验测试分析了冷轧压下量对汽车轻量化用高锰钢高温退火组织的影响，同时测试了不同退火温度下α-M发生逆转变的组织特征。研究结果表明：在高锰钢试样基体内的组织基本都是由γ相晶粒构成，还生成部分α-M相；当压下量增大至70%时，合金组织发生了显著细化，试样内形成了与轧制方向保持平行排布状态的组织，此时γ相和α-M相所占的比例保持基本稳定，α-M相的体积比达到了95%左右；经过10 min保温处理后，γ相的比例几乎达到100%。大部分冷轧样品经过退火处理后都存在马氏体逆转变现象，α-M逆转变期间，当保温时间增加后，可以更快地发生逆转变，γ相比例也随之增大。

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.

基金项目：

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）

李伟（1983－），男，硕士，副教授，E-mail：lizhouchuan691450@126.com

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