为了建立超高强度钢BR1500HS热冲压有限元模型,采用Gleeble1500热模拟机对超高强度钢的高温流变行为及其高温下的力学性能进行测定,获得了该材料在500,600,700,800,900℃的真实应力-应变曲线,并测得BR1500HS在不同应变速率(0.1、0.01 s-1)下的高温流动性能数据.数值分析结果表明,板料减薄率最大预测值为22.53％,在允许范围内.在800 ～ 500℃内,板料平均冷却速率约为100℃/s,大干临界冷却速率,奥氏体将进行非扩散转变.通过对板料热冲压成形前后的微观组织的观察,证实了马氏体转变的事实.
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