汽车前立柱下角撑热成形热-力-相变耦合仿真分析  

Thermal-mechanical-metallurgical coupling simulation snalysis of automotive front pillar lower gussets hot forming

作　　者：谢晖[1] 王晨磊 徐伟力 蒋浩民 吴磊 

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,长沙650093 [2]汽车用钢开发与应用技术国家重点实验室(宝钢集团),上海201900

出　　处：《塑性工程学报》2014年第3期73-77,共5页Journal of Plasticity Engineering

基　　金：国家科技支撑计划资助项目(2012BAF12B20)"大型工程装备制造企业全球集成管控技术研究与应用示范";汽车用钢开发与应用技术国家重点实验室开放课题(2012)

摘　　要：依据相变动力学理论,对高强度钢板热成形微观组织转变与力学性能预测模型进行研究。基于该模型建立汽车前立柱下角撑的热成形有限元模型,采用热-力-相变耦合分析方法对热成形过程进行仿真分析,得到制件的温度、组织和硬度的分布及变化。以高强度硼钢USIBOR1500为试验材料对汽车前立柱下角撑进行试制,并从成形件上取样进行微观组织分析和力学性能测试。结果表明,成形件的微观组织为均匀板条状马氏体,抗拉强度达到1 400MPa以上,3个典型位置的硬度均大于450HV,且力学性能分布与模拟结果一致,验证了所建立模型的可靠性。According to the phase transformation kinetics theory , the model of microstructure transformation and mechanical properties prediction for high strength steel hot forming was analyzed . And based on this model , a hot forming FE model of auto-motive front pillar lower gussets was established , the hot forming process was simulated using thermal-mechanical-metallurgical coupling method ,and the temperature ,microstructure and hardness distribution and changes of the part were obtained . Then some trials of the automotive front pillar lower gussets were accomplished with high strength boron steel USIBOR 1500 as experi-ment material ,and the microstructure and the mechanical properties of the samples on the formed parts were analyzed and tested . The experimental results show that the microstructure of the formed parts is uniform lath martensite , the tensile strength is grea-ter than 1400MPa ,the hardness of three typical positions are above 450HV and the distribution of the mechanical properties a-grees well with the numerical simulation results ,which verify the reliability of the established model .

关 键 词：前立柱下角撑 热成形 热-力-相变耦合 

分 类 号：TG306[金属学及工艺—金属压力加工]