两种应变强化不锈钢在硫化氢环境下的应力腐蚀开裂行为

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At room temperature and -196 ℃, stress corrosion cracking（SCC） behaviors of S30403 stain- less steel and S31608 stainless steel with different predeformations in acid H2S solution are investigated by slow strain rate test（SSRT） and U -bent specimen test. The result shows that both S30403 stainless steel and S31608 stainless steel are all easy tO＇ subject to SCC damage in H2S solution, the SCC susceptiv- ities of S30403 stainless steel are higher than these of S31608 stainless steel;with the increase of prede- formations, the SCC susceptivities of these two kinds of stainless steel increase ; these two kinds of stainless steel have lower SCC susceptivities and higher strength at - 196 ℃.用U型试样浸泡试验、慢应变速率拉伸试验，结合腐蚀形貌和断口形貌的扫描电子显微镜观察，在常温和-196℃下，分别研究了不同预变形量的S30403不锈钢和S31608不锈钢在H，s介质中的应力腐蚀开裂（Stresscorrosioncracking，SCC）行为。研究表明：S30403不锈钢和$31608不锈钢在实验溶液中均有较强的SCC敏感性，S30403不锈钢的SCC敏感性高于S31608不锈钢；随着预拉应变量的增大，两种材料的SCC敏感性均呈现增大的趋势。在-196℃下应变强化处理的两种材料在H2S环境中的SCC敏感性低于其在室温应变强化处理时的SCC敏感性，同时表现出更好的抗拉性能。