摘要
用光学显微镜和扫描电镜观察了不同充氢电流下恒载荷拉伸试样、慢应变速率拉伸试样的显微组织和断口形貌。结果表明:随氢浓度增加、应力减小或应变速率降低,试样断口逐渐从韧性断口向脆性断口过渡;氢致开裂微裂纹通常在杂质处形成并呈不连续扩展,形成穿晶断裂。
Microstructure and fractography for the specimens of X80 pipeline steel chargied with hydrogen in constant load tests and in slow strain rate tests(SSRT)were studied by optical microscopy and SEM. Experimental results showed that the ratio of cleavage fracture to ductile fracture on fracture surface increased gradually with increasing hydrogen concentration and decreasing stress or strain rate. The microcracks of HIC were initiated generally at the inclusion and grew discontinuously. Finally, transgranular fracture was observed.
出处
《机械工程材料》
CAS
CSCD
北大核心
2004年第3期13-15,共3页
Materials For Mechanical Engineering
基金
北京科技大学环境断裂开放实验室基金资助项目(G19990650)
关键词
管线钢
氢致开裂
显微组织
pipeline steel
hydrogen induced cracking
microstructure
