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

摘要

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H2 S介质中的应力腐蚀开裂（ Stress corrosion cracking ，SCC）行为。研究表明：S30403不锈钢和S31608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H2 S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。%At room temperature and -196 ℃,stress corrosion cracking(SCC) behaviors of S30403 stain-less steel and S31608 stainless steel with different predeformations in acid H 2 S solution are investigated by slow strain rate test ( SSRT) and U-bent specimen test .The result shows that both S 30403 stainless steel and S31608 stainless steel are all easy to subject to SCC damage in H 2 S solution,the SCC susceptiv-ities of S30403 stainless steel are higher than these of S 31608 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 ℃.