油气田异种金属焊接接头硫化物应力腐蚀开裂研究进展
刘久云, 董立谨, 张言, 王勤英, 刘丽

Research Progress on Sulfide Stress Corrosion Cracking of Dissimilar Weld Joints in Oil and Gas Fields
LIU Jiuyun, DONG Lijin, ZHANG Yan, WANG Qinying, LIU Li
图3 X60管线钢和Inconel 625合金异种金属焊接接头SSCC裂纹扩展示意图[32]
Fig.3 Schematic of crack growth of the dissimilar metal welded joint of X60 pipeline steel (base metal) and Inconel 625 alloy (weld metal) in SSCC test using four-point bending with 80% AYS in H2S solution (5% NaCl + 0.5% HAc with 0.1 MPa H2S)[32]: (a) stress concentration and dislocation occurred at the fusion boundary after immersion, (b) micro-crack nucleated when stress concentration was high enough to tear the fusion boundary, (c) crack growth was suspended due to crack blunting, (d) anodic dissolution could keep the crack tip sharp and reactivate the crack growth