温轧对DP590钢层状超细晶双相组织与拉伸性能的影响  

Effect of Warm Rolling on Laminated Ultra-fine Grained Dual-phase Microstructure and Tensile Properties of DP590 Steel

作　　者：苏元飞 李慧杰 徐晓宁 叶其斌[1,2] SU Yuan-fei;LI Hui-jie;XU Xiao-ning;YE Qi-bin(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China;Institute of Research of Iron&Steel,Shagang,Jiangsu Province,Zhangjiagang 215625,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819 [2]江苏省(沙钢)钢铁研究院,江苏张家港215625

出　　处：《东北大学学报（自然科学版）》2023年第3期357-362,369,共7页Journal of Northeastern University(Natural Science)

基　　金：辽宁省科技重大专项(2020JH1/10100001).

摘　　要：研究了DP590钢两相区不同温度轧制制备层状超细晶双相组织及其对力学性能的影响.结果表明,分别在两相区720,760和800℃温轧(对应WR720,WR760和WR800)时,钢板均获得层状结构超细晶铁素体和马氏体双相组织.对应马氏体体积分数分别为26.5%,37.2%和30.8%,大角度晶界铁素体平均晶粒尺寸分别为(1.92±1.32),(1.44±2.14)和(1.79±1.54)μm.值得关注的是,组织特征与力学性能和温轧温度并非线性对应关系,而是中间温度即760℃轧制钢板晶粒尺寸最小,马氏体体积分数最高,相应屈服强度和抗拉强度最高.从形变诱导铁素体相变和铁素体动态再结晶两方面讨论了这种温轧温度与组织及力学性能的非线性变化关系.The preparation of laminated ultra-fine grain dual-phase microstructure by rolling DP590 steel at different temperatures in the dual-phase zone and its effect on mechanical properties were investigated.The results showed that the laminated ultra-fine grain ferrite and martensite dual-phase microstructure was obtained when the steel was rolled at 720,760 and 800℃in the dual-phase zone(corresponding to WR720,WR760 and WR800).The corresponding martensite volume fractions are 26.5%,37.2%and 30.8%,respectively,and the average grain sizes of large angle grain boundary ferrite are(1.92±1.32),(1.44±2.14)and(1.79±1.54)μm,respectively.It is worth noting that the microstructure characteristics and mechanical properties do not correspond linearly with the warm rolling temperature,but the intermediate temperature,i.e.,760℃,rolled steel plate grain size is the smallest,martensite volume fraction is the highest,the corresponding yield strength and tensile strength is the highest.This nonlinear relationship between temperature and mechanical properties is discussed in terms of deformation-induced ferrite phase transformation and dynamic recrystallization of ferrite.

关 键 词：温轧 层状超细晶 双相钢 晶粒细化 动态再结晶 

分 类 号：TG335.11[金属学及工艺—金属压力加工]