利用3 000 kN电子万能试验机和ZWICK HTM5020高速拉伸试验装置研究了双相钢(DP钢)在不同应变速率(10-4 ～600 s-1)下的拉伸变形行为,并结合XRD分析对双相钢组织中的位错密度进行了计算.结果表明,在准静态拉伸过程中,双相钢组织中的位错密度基本不变,其抗拉强度、断裂延伸率随应变速率变化也不明显;而在动态拉伸条件下,随着应变速率的增加,双相钢组织中的位错密度不断增加,抗拉强度也相应增加,塑性降低,最终导致能量吸收下降.
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