【摘 要】
：
汽车用钢需求高速增长,同时也向着高强度化方向发展。钢在高应变速率条件下的力学性能及变形行为与静态条件下的相比具有显著区别;通过高速拉伸实验,分别研究了DP780双相钢和DC53D+ZF钢两种材料的高应变速率行为,分析了应变速率对钢的力学性能、组织形变的影响,并建立了相应的本构方程。根据获得的本构方程,对DC53D+ZF钢板的矩形梁碰撞进行了模拟计算。结果表明,碰撞过程中应变速率的影响较大,采用所推
【机 构】
：
北京科技大学材料科学与工程学院,北京 100083;材料先进制备技术教育部重点实验室,北京 100083
【出 处】
：
第十届中国钢铁年会暨第六届宝钢学术年会
论文部分内容阅读
汽车用钢需求高速增长,同时也向着高强度化方向发展。钢在高应变速率条件下的力学性能及变形行为与静态条件下的相比具有显著区别;通过高速拉伸实验,分别研究了DP780双相钢和DC53D+ZF钢两种材料的高应变速率行为,分析了应变速率对钢的力学性能、组织形变的影响,并建立了相应的本构方程。根据获得的本构方程,对DC53D+ZF钢板的矩形梁碰撞进行了模拟计算。结果表明,碰撞过程中应变速率的影响较大,采用所推导J-C模型的仿真结果与试验获得的材料真应力-应变曲线的计算结果最为接近。以980MPa级Nb微合金化(C-Si-Mn-Cr-Nb)冷轧超高强双相钢为例,分析了Nb析出历程及相应粒子形貌,可以通过在不同冶金工艺阶段的析出特征进行相应的工艺控制,以得到目标组织及纳米析出粒子的分布。
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