典型汽车用钢板应变速率敏感性实验

为研究应变速率对汽车钢板冲压成形性能的影响,采用单向拉伸实验,对3种不同强度级别的典型汽车用钢板进行应变速率敏感性研究。结果显示,电镀锌BSUFD+Z钢板的屈强比对应变速率的敏感性最大,其次是烘烤硬化BH220钢板,敏感性最小的是双相DP600钢板;双相DP600钢板的硬化指数具有较大的应变速率敏感性,而电镀锌BSUFD+Z钢板和烘烤硬化BH220钢板的硬化指数对应变速率的敏感性较低;3种钢板的应变速率敏感指数,电镀锌BSUFD+Z钢板最大,烘烤硬化BH220钢板次之,双相DP600钢板最小。研究结果为汽车钢板快速冲压生产工艺设计提供了参考。

Experimental research on strain rate sensitivity of automotive steel sheet

To investigate the effect of strain rate on stamping automotive steel sheets,uniaxial tensile tests have been carried out to study the strain rate sensitivity of three kinds of automotive steel sheets under different strength levels.The results showed that: 1)the electrolytic zinc BSUFD+Z steel sheet had the highest effect of strain rate on yield-stress ratio,the second highest was the baked hardening BH220 steel and the lowest was the dual phase DP600 steel.2)the strain rate had stronger effect on the strain hardening exponent of the dual phase DP600 steel than those of the electrolytic zinc BSUFD+Z steel and the baked hardening BH220 steel.3)the coefficient of strain rate sensitivity of the electrolytic zinc BSUFD+Z steel plate was the highest,followed by the baked hardening BH220 steel and the lowest was the dual phase DP600 steel.The results provided the reference for the technical design of rapid stamping process of auto steel.