采用慢应变速率拉伸试验(SSRT)研究了不同外加电位下X70管线钢在库尔勒土壤模拟溶液中的应力腐蚀开裂(SCC)行为，并用扫描电镜分析了不同电位下的断面形貌。结果表明，X70管线钢在库尔勒土壤模拟溶液中具有SCC敏感性；在E corr附近施加弱极化时，应力腐蚀开裂敏感性增加；施加强阳极电位时，发生强烈阳极溶解，导致阳极溶解断裂；施加强阴极电位时，析氢过程加强，导致氢致应力腐蚀断裂。
Stress corrosion cracking (SCC) behavior of X70 pipeline steel in simulated Ku$^\prime$erle soil solution at different applied potentials was investigated using slow strain rate testing (SSRT). Morphology of X70 pipeline steel fracture surface at different applied potentials was observed by scanning electron microscope (SEM). The results showed that X70 pipeline steel was susceptible to SCC in simulated solutions. It was found that low potentials applied increased susceptibility to SCC at open circuit potential (OCP). The fracture mechanism followed anodic dissolution mechanism of SCC. The precipitation of hydrogen increased hydrogen diffusion into the metal, hence increased susceptibility to SCC under higher cathode potential in simulated solution. The fracture followed hydrogen induced cracking mechanism.
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