采用慢应变速率实验(SSRT)研究了不同温度和电位下X70管线钢在近中性pH溶液中的应力腐蚀破裂(SCC)行为. 结果表明, 不同温度下, X70管线钢在近中性pH溶液中的开裂方式都是穿晶型的, 具有准解理特征, 并且随着外加阴极电位的降低, SCC敏感性增加, 氢致开裂占主导. 随温度的下降, 溶液pH值略有降低, SCC敏感性增加.
The stress corrosion cracking (SCC) behaviors of X70 pipeline steel in near-neutral pH solutions at different temperatures and applied potentials are studied with slow strain rate testing (SSRT). The results show that the cracking mode of X70 pipeline steel in near-neutral pH solutions is transgranular at different temperatures with the feature of quasi-cleavage. The susceptibility to SCC increases as the applied potential moved towards the cathodic direction. Hydrogen induced cracking (HIC) dominates the process. The value of pH decreases slightly with decreasing temperature of the solution, and the susceptibility to SCC increases.
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