HB400/HG70双金属工程机械钢热轧结合行为模拟研究  

Simulation Research on Hot Rolling Behavior of HB400/HG70 Bimetallic Machinery Steel

作　　者：饶永鹏 蒋际循 秦芳诚 齐会萍[3] 张连明[2] RAO Yongpeng;JIANG Jixun;QIN Fangcheng;QI Huiping;ZHANG Lianming(College of Materials Science and Engineering,Guilin University of Tech-nology,Guangxi Guilin 541004,China;College of Chemistry and Bioengineering,Guilin University of Tech-nology,Guangxi Guilin 541004,China;College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030034,China)

机构地区：[1]桂林理工大学材料科学与工程学院,广西桂林541004 [2]桂林理工大学化学与生物工程学院,广西桂林541004 [3]太原科技大学材料科学与工程学院,太原030034

出　　处：《精密成形工程》2024年第11期91-99,共9页Journal of Netshape Forming Engineering

基　　金：广西科技重大专项(AA22067081-2);国家自然科学基金(52265045)。

摘　　要：目的研究HB400/HG70双金属热轧过程中轧制温度、压下率和轧辊转速对应力、应变及温度分布的影响规律。方法利用ABAQUS有限元数值模拟软件,建立了HB400耐磨钢/HG70焊接钢双金属热轧有限元模型。结果当压下率从50%增加至60%时,HB400与HG70两侧等效应变差值增大,已结合的部位由于变形量加大和应力集中导致结合失效。当压下率为50%时,结合区域等效应变为0.77~0.87,两侧的平均等效应变差值为0.0047且最大值为0.01。轧制速度过快导致双金属未完全结合就离开了轧制区域,降低轧制速度可以使垂直轧制方向的应力分布更均匀,当轧制速度为0.6 rad/s时,HB400与HG70两侧等效应变没有明显差别。温度升高可以提高HB400与HG70两侧的变形均匀性。随着压下率的增加,复合板与轧辊的传热效率增强。复合板的温度下降更加明显。结论HB400与HG70双金属复合板的轧制协调性较好,无明显翘曲。热轧后双金属外侧应力大于结合区域应力;提高轧制温度、压下率和降低轧辊转速,能使垂直轧制方向的应力分布更均匀。最佳的热轧条件为温度1200℃、压下率50%、轧制速度0.6rad/s。The work aims to investigate the effects of rolling temperature,rolling ratio,and rolling speed on the stress,strain and temperature distribution during the hot rolling process of HB400/HG70 bimetal.The HB400/HG70 bimetallic hot-rolled fi-nite element model was established based on ABAQUS simulation software.The equivalent strain difference between HB400 and HG70 increased on both sides with the increase of the rolling ratio from 50%to 60%.The failure of bonded areas was caused by the increased rolling ratio and stress concentration.When the rolling ratio was 50%,the equivalent variance of bond-ing areas was between 0.77 and 0.87,with a difference in equivalent variance of 0.0047 and a maximum value of 0.01 on both sides.The insufficient bonding due to the excessive rolling speed and reduce the rolling speed were beneficial to the uniformity of the stress distribution in the vertical rolling direction.There was no significant difference between the equivalent strain on both sides of HB400 and HG70 at rolling speed of 0.6 rad/s.The high temperature was conducive to improving the deformation uniformity between HB400 and HG70 sides.The heat transfer efficiency between the composite plate and the rollers was en-hanced with the increase of the rolling ratio.In conclusion,HB400 and HG70 bimetal composite plates have good rolling coor-dination without obvious warping.The external stress of the bimetal after hot rolling is greater than that in the bonding area.The increase in rolling temperature,rolling ratio and the decrease in rolling speed are conducive the uniformity of stress distribution in the vertical rolling direction.The optimum rolling condition is 1200℃,rolling ratio of 50%,and rolling speed of 0.6 rad/s.

关 键 词：双金属材料 热轧工艺 结合行为 压下率 等效应变 

分 类 号：TG331[金属学及工艺—金属压力加工] TG142[一般工业技术—材料科学与工程]