热冲压工艺参数对B400VK钢U型件相变组织影响的模拟分析  

Simulation analysis of the effect of hot stamping process parameters on transformation microstructure of U-shaped B400VK steel part

作　　者：张辉[1] 潘爱琼 李世云 Zhang Hui;Pan Aiqiong;Li Shiyun(School of Mechanical Engineering,Zhengzhou College of Science and Technology,Zhengzhou Henan 450064,China;BYD Co.,Ltd.,Shenzhen Guangdong 518118,China)

机构地区：[1]郑州科技学院机械工程学院,河南郑州450064 [2]比亚迪股份有限公司,广东深圳518118

出　　处：《金属热处理》2019年第12期248-251,共4页Heat Treatment of Metals

基　　金：河南省科技厅计划项目(182102210553)

摘　　要：通过对B400VK钢制U型件热冲压成型过程的有限元数值模拟,分别分析了板料成型初始温度、保压时间和冷却水速对相变组织含量的影响规律。结果表明,为获得含量较多的马氏体组织,优化选取成型初始温度为950℃,保压时间为7 s,冷却水速为4 m/s进行生产试制,试制产品各部分均发现大量板条状马氏体,其含量顶部较高,侧面和法兰依次递减,强度和硬度满足要求,与模拟结果吻合较好。The influence of initial temperature,holding time and cooling water speed on transformation microconstituent content were analyzed with finite element numerical simulation of hot stamping process for U-shaped part made of B400VK steel.The results show that in order to obtain more martensite,the initial forming temperature is optimized for trial production as 950℃,holding time as 7 s and cooling water rate as 4 m/s.Large amount of lath martensite is found in all parts of the trial products,its content is higher at the top,and decreases gradually at the side and flange,and the strength and hardness meet the requirements,which are in good agreement with the simulation results.

关 键 词：B400VK钢 U型件 热冲压 工艺分析 相变组织 

分 类 号：TG156[金属学及工艺—热处理]