关键词: B1500HS超高强钢, 热成形, 车门防撞梁, 数值模拟

Abstract: Based on the hot stamping module of DYNAFORM software, the hot forming process of one vehicle door anti-collision beam made of B1500HS steel was studied. By introducing the thermal physical parameters of H13 die steel, the variation formula of temperature field element was obtained by the method of multi-step difference, taking the latent heat of phase transformation into account. The structural characteristics of the door anti-collision beams were analyzed, two kinds of thermal-mechanical-metallurgical coupling models were established. After comparing and analyzing the stress fields, temperature fields and thickness distributions of the overall and typical M-shaped-section of the schemes, it is found that the scheme with pad is more suitable for hot stamping, because of their uniform distribution after hot forming and quenching. Finally, the hot stamping experiments were carried out, referring to relevant parameters of the scheme with pad, and the experimental results show that microstructures of the door anti-collision beam are all martensite. In addition, the martensites lath at the bottom and top is finer, and the Vickers hardness reaches above 450HV, which meets the performance standard of hot stamping parts.

Key words: B1500HS ultra-high strength steel, hot forming, door anti-collision beam, numerical simulation