冷轧压下量对汽车轻量化用高锰钢高温退火组织的影响  

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

作　　者：李伟[1] 王凯 Li Wei;Wang Kai(School of Mechanical Engineering,Zhengzhou University of Science and Technology,Zhengzhou 450064,China;Institute of Metals,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]郑州科技学院机械工程学院,河南郑州450064 [2]中国科学院金属研究所,吉林沈阳110016

出　　处：《锻压技术》2019年第11期164-169,共6页Forging & Stamping Technology

基　　金：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)

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 ofα-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 ofγphase grains,and someα-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 ofγphase andα-M phase remains basically stable,and the volume ratio ofα-M phase reaches about 95%.Then,after thermal insulation treatment for 10 min,the proportion ofγphase reaches almost 100%.However,most cold rolling samples have reverse transformation of martensite after annealing treatment.During theα-M reverse transformation period,when the thermal insulation time increases,the reverse transformation occurs faster,and the proportion ofγphase also increases.

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[一般工业技术—材料科学与工程]