硼钢热冲压微观组织仿真及力学性能预测
发布时间：2019-03-28 09:59
【摘要】：基于Johnson-Mehl-Avrami相变动力学模型和Koistinen-Marburger方程,建立了硼钢22Mn B5车门防撞梁热冲压过程的热机械-相变耦合有限元模型,得到了车门防撞梁热冲压过程中板料温度、微观组织及维氏硬度的分布特征,研究了保压压力和保压时间对防撞梁热冲压零件的性能影响.仿真结果表明:车门防撞梁顶部冷却速度为137.3℃·s-1,侧壁冷却速度为69.8℃·s-1,冷却速度决定了防撞梁各个部位的微观组织和维氏硬度;随着保压压力的增大,获得95%以上马氏体的防撞梁的保压时间缩短,可加快生产节拍.进行了防撞梁热冲压试验,对微观组织及维氏显微硬度进行了检测.结果表明:车门防撞梁保压10 s后,顶部及侧壁均已转化为板条状马氏体组织,且顶部硬度为508 HV,侧壁硬度为474 HV.
[Abstract]:Based on the dynamic model of Johnson-Mehl-Avrami phase transition and Koistinen-Marburger equation, the thermal mechanical-phase transition coupling finite element model was established for the stamping process of 22Mn B5 door of boron steel, and the sheet temperature in the stamping process of Liang Re was obtained. The distribution characteristics of microstructure and Vickers hardness were studied. The effects of holding pressure and holding time on the properties of impact-proof Liang Re stamping parts were studied. The simulation results show that the cooling rate at the top of the anti-collision beam is 137.3 鈩，
本文编号：2448765
[Abstract]:Based on the dynamic model of Johnson-Mehl-Avrami phase transition and Koistinen-Marburger equation, the thermal mechanical-phase transition coupling finite element model was established for the stamping process of 22Mn B5 door of boron steel, and the sheet temperature in the stamping process of Liang Re was obtained. The distribution characteristics of microstructure and Vickers hardness were studied. The effects of holding pressure and holding time on the properties of impact-proof Liang Re stamping parts were studied. The simulation results show that the cooling rate at the top of the anti-collision beam is 137.3 鈩，
本文编号：2448765
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