轧制工艺对钢板组织形貌及内应力的影响  

Effect of Rolling Process on Microstructure Morphology and Internal Stress of Steel Plate

作　　者：高朋 卓越 郭艳艳[1] 孙国栋[3] 孙建亮 GAO Peng;ZHUO Yue;GUO Yan-yan;SUN Guo-dong;SUN Jian-liang(School of Mechanical and Intelligent Manufacturing,Jiujiang University,Jiujiang 332005,China;Library,Jiujiang University,Jiujiang 332005,China;School of Materials Science and Engineering,Jiujiang University,Jiujiang 332005,China;National Engineering Research Center for Equipment and Technology of Cold Rolling Strip,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]九江学院机械与智能制造学院,江西九江332005 [2]九江学院图书馆,江西九江332005 [3]九江学院材料科学与工程学院,江西九江332005 [4]燕山大学国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛066004

出　　处：《材料保护》2022年第12期7-13,共7页Materials Protection

基　　金：国家重点研发计划资助项目(2017YFB0306404);江西省教育厅科技项目(GJJ211821)资助。

摘　　要：为了研究不同轧制工艺对管线钢组织形貌及内应力的影响,通过轧制工艺实验、热力耦合数值仿真2种方法研究不同工艺下钢板的温度场及应力场,利用金相显微镜、XRD分析测试钢板的显微组织形貌和内应力。通过对钢板表面温度进行实测,结果表明:模拟值与实测值误差较小,数值仿真计算的温度场合理,可作为应力场分析依据。钢板经过20 s水冷后,钢板芯部与角部最大温差318℃,最小温差211℃;钢板芯部与角部最大应力差417 MPa,最小应力差260 MPa,获得的钢板显微组织由贝氏体、马氏体、铁素体组成。根据实验和数值分析结果得出,终轧温度控制在800~900℃,冷却速率控制在20~25℃/s区间比较合理。在此工艺参数下钢板的相变形核率高,内应力差值较小,并最终形成了马氏体、贝氏体、铁素体的混合组织。For studying the influence of different rolling processes on the microstructure morphology and internal stress of pipeline steel,the temperature field and stress field of steel plate under different processes were studied by rolling process experiment and thermal mechanical coupling numerical simulation.Subsequently,the microstructure morphology and internal stress of steel plate were tested and analyzed by metallographic microscope and XRD.The results of an actual measurement of the surface temperature of steel plate showed that the error between the simulated value and the measured value was small,and the temperature field calculated by numerical simulation was reasonable,which could be the basis for stress field analysis.After the steel plate was water-cooled for 20 s,the maximum and minimum temperature differences between the steel plate core and corner were 318℃and 211℃respectively.The maximum and minimum stress difference between the core and corner of the steel plate was 417 MPa and 260 MPa respectively.In addition,the obtained microstructure was composed of bainite,martensite and ferrite.It could be concluded from the results of experiments and numerical analysis that,it was reasonable to control the final rolling temperature at 800~900℃and the cooling rate at 20~25℃/s.Under these process parameters,the phase transformation nucleation rate of the steel plate was high,the internal stress difference was small,and a mixed microstructure comprising of martensite,bainite and ferrite was finally formed.

关 键 词：热力耦合 轧制工艺 管线钢 显微组织 内应力 

分 类 号：TG335.11[金属学及工艺—金属压力加工]