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在慢应变速率条件下，研究了Ｆｅ－Ｓｉ－Ｃ系铁素体－马氏体双相钢焊接接头在人造海水中的应力腐蚀开裂（ＳＣＣ）行为。用单边预裂纹拉伸试样测定了焊接接头各部位的应力强度因子Ｋ１值。结果表明，焊接接头各部位在人造海水中的应力腐蚀开裂敏感性有很大差异，其中热影响区（ＨＡＺ）对ＳＣＣ最敏感，Ｋ１值最低；随着阴极电位朝负方向增加，ＳＣＣ敏感性增大；除氢处理可以改善焊接接头的ＳＣＣ抗力。
At slow strain rate, the stress corrosion cracking (SCC) behavior of Fe-Si-C ferritic-martensitic duplex welded joints in artificial seawater was investigated. The uniaxial pre-crack tensile specimens were used to measure the stress intensity factor K1 of each part of welded joint. The results show that there are great differences in the stress corrosion cracking susceptibility between artificial seawater and artificial seawater. HAZ is the most sensitive to SCC and K1 is the lowest. With the increase of cathodic potential in negative direction, SCC sensitivity Increase; hydrogen treatment can improve the SCC resistance of welded joints.