高强钢板热冲压工艺中的相变模拟

Phase transformation simulation of high strength steel under hot stamping process

热冲压技术可以有效缓解高强钢板成形件起皱、开裂等缺陷,在汽车行业中得到广泛应用。文章以固态相变原理为依据,将流体动力学引入到热冲压工艺中,建立了热-流-力-相多场耦合平台,分析工艺参数对成形件组织分布的影响。结果表明,空冷后成形件马氏体含量随保压时间、水流速的增加而升高,获得马氏体含量充分的成形件的临界保压时间为13s。成形件组织分布不均,底部马氏体含量最少,法兰马氏体含量最多,试验结果与模拟结果吻合较好。

Hot stamping can virtually avoid the cracking and wrinkling of high strength steel（HSS） sheets,and is widely used in automotive industry.In this work,thermal-fluid-mechanical-phase multi-field coupling platform was established,and the effects of process parameters on microstructure distribution were analyzed.Results showed that martensitic content increased with the increase of holding time and flow speed,and 13s was the critical holding time for obtaining a fully martensitic formed part.The martensitic content of the formed part was highest at the flange,and lowest at the bottom.The simulation results were in good agreement with the experimental results.