研究了应力比、加载频率和外加横向载荷等力学因素对X70管线钢在新疆土壤溶液中穿晶应力腐蚀开裂裂纹萌生的影响,并结合环境扫描电镜对腐蚀样品表面进行观察.结果表明:低应力比增加了载荷的波动,促进了管线钢应力腐蚀开裂裂纹的萌生;当波动载荷作用于样品的循环周次相同时,频率越低越有利于穿晶应力腐蚀开裂(TGSCC)裂纹的萌生;当波动载荷作用于样品的时间相同时,频率越高有利于裂纹的萌生;垂直于拉-拉应力方向的外加横向载荷促进了TGSCC裂纹的萌生.
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