利用Hopkinson压杆加载装置对圆柱状热处理态X70管线钢试样进行了动态冲击压缩实验,研究了损伤微结构演化与宏观力学行为之间的对应关系.结果表明:在ε≤2.5×103s-1条件下,以马氏体组织为主的淬火X70管线钢变形抗力及变形能力较差,当其内部损伤引起的材料软化起主导作用时,材料表现出反向应变率效应;在应变率高达2.5×103s-1变形条件下,淬火态X70管线钢产生了剪切形变带,并且带内及周围都出现了孔洞,带内硬度明显增加.
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