冷轧压下率对IF钢微结构、织构及深冲性能的影响  

Effect of cold rolling reduction rate on microstructure, texture and deep drawing properties of IF steel

作　　者：许峰 肖颖 陈前 邓长春 孙晓寒 Xu Feng;Xiao Ying;Chen Qian;Deng Changchun;Sun Xiaohan(School of Automotive Engineering,Changshu Institute of Technology,Changshu Jiangsu 215500,China;Yieh Phui(China)Technomaterial Co.,Ltd.,Changshu Jiangsu 215500,China)

机构地区：[1]常熟理工学院汽车工程学院,江苏常熟215500 [2]烨辉(中国)科技有限公司,江苏常熟215500

出　　处：《金属热处理》2022年第1期250-255,共6页Heat Treatment of Metals

基　　金：江苏省高等学校自然科学研究重大项目(18KJA460001)。

摘　　要：对不同冷轧压下率IF钢进行模拟连续退火试验,研究在冷轧-退火过程中冷轧压下率对微结构和织构演变及深冲性能的影响。结果表明:冷轧变形后原始晶粒拉长变形,样品具有强α取向线织构和γ取向线织构,α取向线织构的极密度最大值随压下率(65%、72%、80%)的增加从7.7逐渐增加至13.1。模拟连续退火后发生完全再结晶,在65%、72%、80%冷轧压下率下分别生成15.6、18.8和17.6μm的均匀等轴晶。模拟连续退火后,α取向线织构被消除,γ取向线织构变化不大,极密度最大值转移到γ取向线,且随着压下率的增加从7.8略微增大到8.6。不同压下率样品模拟连续退火后,深冲性能良好,随着压下率的增加,r从1.77逐渐增大至2.17,|△r|从0.54降低至0.02,n从0.284减小到0.272。Simulated continuous annealing test of the IF steel with different cold rolling reduction rates was carried out to study the effect of cold rolling reduction rate on the microstructure, texture evolution and deep drawing properties during the cold rolling-annealing process. The results show that initial grains are elongated after cold rolling, and the specimen has strong α-orientation line texture and γ-orientation line texture. The maximum value of polar density of α-orientation line texture increases from 7.7 to 13.1 with the increase of the reduction rate(65%, 72%, 80%). Complete recrystallization occurs after simulated continuous annealing, and uniform equiaxed crystals of 15.6, 18.8, and 17.6 μm are generated at 65%, 72% and 80% cold rolling reduction rates, respectively. After simulated continuous annealing, the α-orientation line texture is eliminated, and the γ-orientation line texture does not change much. The maximum value of polar density transfers to γ-orientation line, which slightly increases from 7.8 to 8.6 as the reduction rate increases. The deep drawing properties of the specimen with different reduction rates is good after simulated continuous annealing. As the reduction rate increases, |△r|decreases from 0.54 to 0.02 n decreases from 0284 to 0.272.

关 键 词：IF钢 微结构 织构 深冲性能 

分 类 号：TG161[金属学及工艺—热处理]