【摘要】 采用循环极化曲线测试、慢应变速率拉伸试验,结合扫描电镜观察研究了在钨极氩弧焊的保护气体中加入2%氮气对2205双相不锈钢焊接接头的相比例、点蚀和应力腐蚀开裂敏感性的影响。结果表明,虽然焊接导致材料中γ相含量降低,点蚀和应力腐蚀的敏感性增大,但与100%氩气的保护气体相比,加入2%氮气后促进了γ相转变,使焊接接头两相比例接近于母材,并使焊接对点蚀和应力腐蚀的不利影响受到有效抑制。更多还原

【Abstract】 Effects of addition of 2% nitrogen in shielding gas on microstructure,susceptibility to pitting corrosion and stress corrosion cracking(SCC) of duplex stainless steel 2205 welded joints were studied by cyclic polarization curve testing,slow strain rate testing and SEM.The results show that the content of γ-phase decreases by welding,and at the same time,the susceptibility to pitting corrosion and SCC increases.Compared with 100% argon as shielding gas,the addition of 2% nitrogen in the shielding gas promotes γ-phase formation so as to make γ / α ratio of the welded joints close to that of the base metal.Meanwhile the adverse effects of welding on pitting corrosion and SCC of the steel were inhibited effectively.更多还原