采用慢应变速率法(SSRT)进行了X70管线钢焊接接头在H2S介质中应力腐蚀试验，研究了H2S对X70管线钢焊接接头应力腐蚀开裂(SSCC)的敏感性，分析了激光冲击处理对X70管线钢焊接接头抗H2S应力腐蚀开裂SSCC行为的影响。结果表明，经激光冲击处理后X70管线钢焊接接头表面产生了晶粒细化和残余压应力，提高了管线钢焊接接头在NACE饱和H2S溶液中抗应力腐蚀性能；原始状态试样在NACE饱和H2S溶液中慢拉伸试验平均应力腐蚀敏感性指数>25%，有明显的应力腐蚀倾向；经激光冲击处理后试样在NACE饱和 H2S溶液中平均应力腐蚀敏感性指数为19.05%，应力腐蚀倾向不明显，因此，激光冲击处理有效地提高了X70管线钢焊接接头的抗应力腐蚀性能。
The stress corrosion of X70 pipeline welded joint in H2S medium was tested with slow strain rate testing (SSRT), the effect of H2S on sulfide stress corrosion cracking (SSCC) for X70 pipeline welded joint was investigated, and the effect of laser shock processing on SSCC for X70 pipeline welded joint was analyzed. The experimental results showed that the grain refinement and compressive residual stress are produced in the surface of X70 pipeline steel welded joint by laser shock processing, thus increasing the resistance to stress corrosion for X70 pipeline welded joint in the NACE saturated H2S solutions. The average index of stress corrosion sensitivity for the primitive sample in the saturated NACE H2S solution during SSRT was bigger than 25%, having clear tendency of stress corrosion cracking. The average index of stress corrosion sensitivity for the sample treated laser shock processing in the NACE saturated H2S solution was 19.05%, showing its tendency of stress corrosion is not obvious, as a result, laser shock processing has effectively improved resistance to stress corrosion of X70 pipeline steel welded joint.
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