高强钢激光拼焊板热冲压材料模型的构建及实验验证

Finite Element Model of Hot Stamping of Tailor Welded High Strength Steel and Its Experimental Verification

为了能够采用数值方法准确模拟高强钢激光拼焊板热冲压过程,研究了热冲压过程的相变转化模型、传热模型及激光拼焊板的热力学模型,包括2种母材及焊缝区域热力学模型的建立,并建立了完整的数值仿真模型.选取1.6 mm的硼钢B1500HS和1.2 mm的低合金高强钢B340LA进行激光拼焊,对其进行热冲压成形实验,并对热冲压件B柱加强件进行厚度分布分析及微观组织测试,通过与数值模拟结果的比对验证了材料模型的可靠性.

The modeling and simulation of hot stamping tailor welded high strength steels, including phase transformation modeling, thermal modeling and thermal-mechanical modeling were conducted to precisely simulate the hot stamping process. The parent materials and welding zone of tailor welded blanks should be sufficiently accurate to describe thermal, mechanical parameters. An finite element （FE） model using tailor welded blanks （TWBs） with the thickness combination of 1.6 mm boron steel B1500HS and 1.2 mm low alloy steel B340LA was established. In order to validate the material model, the thickness distribution and microstructure distribution of the hot stamped mini b-pillar reinforcement component were investigated.