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采用慢应变速率实验(SSRT)研究了S355钢在3.5%Na Cl溶液中应力腐蚀破裂(SCC)行为,通过σ-ε曲线分析了不同温度下S355钢应力腐蚀开裂敏感性指数。采用SEM观察了断口及其孕育期、扩展区、瞬断区和腐蚀物形貌,并分析了腐蚀物化学成分。结果表明,随溶液温度升高,内积功应力腐蚀敏感性指数ISCC下降,在20~50℃范围内ISCC均小于25%,断口为韧性断口,S355钢在3.5%Na Cl溶液中没有明显的应力腐蚀倾向;随溶液温度升高,开裂源变小,而韧窝尺寸和氧化物体积变大,抗氢致开裂能力增强,说明S355钢具有较高的抗应力腐蚀性能。
The stress corrosion cracking (SCC) behavior of S355 steel in 3.5% NaCl solution was studied by slow strain rate test (SSRT). The stress corrosion cracking susceptibility index of S355 steel at different temperatures was analyzed by σ-ε curve. SEM was used to observe the fracture surface, the growth period, the extension area, the instantaneous area and the morphology of the corrosion products. The chemical compositions of the corrosion products were also analyzed. The results show that with the increase of solution temperature, the ISCC of inner product work stress decreases, and ISCC is less than 25% in the range of 20-50 ℃. The fracture of the S355 steel is 3.5% Na Cl Stress corrosion tendency. With the increase of solution temperature, the cracking source becomes smaller and the dimple size and oxide volume become larger, and the hydrogen cracking resistance is enhanced, which shows that S355 steel has higher stress corrosion resistance.