通过U弯浸泡实验研究了电渣焊600合金、电渣焊690合金和埋弧焊690合金三种材料的应力腐蚀行为。研究结果表明：模拟压水堆核电站一回路水化学工况，温度为325℃，压力为15.8 MPa，溶液中含1.5×10-3 B、2.3×10-6 Li、2.5×10-6 H2，浸泡1193 h后，电渣焊600合金、电渣焊690合金和埋弧焊690合金样品均未发生应力腐蚀开裂。在温度为330℃，压力为11 MPa，含10 mass% NaOH的高温高压强碱溶液中，电渣焊600合金样品浸泡720 h后发生了应力腐蚀开裂，最大裂纹长度为835 μm；浸泡1440 h后，裂纹进一步扩展，达到1135 μm，具有典型的沿晶应力腐蚀开裂（IGSCC）特征；电渣焊690合金样品经过1440 h浸泡后，表面萌生长度为0.3 μm到1.15 μm不等的微裂纹；埋弧焊690合金样品经过1440 h浸泡后未发生应力腐蚀开裂。
U-bend immersion tests were used for studying the stress corrosion cracking behaviors for electroslag welding (ESW) Alloy 600, electroslag welding (ESW) Alloy 690 and submerged-arc welding (SAW) Alloy 690. Results showed that electroslag welding Alloy 600, electroslag welding Alloy 690 and submerged-arc welding Alloy 690 samples were immune to stress corrosion cracking in simulated primary water of pressurized water reactor (PWR) after being immersed for 1193 h, which contained 1.5×10-3 B, 2.3×10-6 Li, 2.5×10-6 H2 at 325 ℃, 15.8 MPa. However, stress corrosion cracks were observed in electroslag welding Alloy 600 after being immersed in 10 wt.% NaOH alkali solution for 720 h at 330℃, 11 MPa. The maximum crack length was 835 μm after 720 h immersion and further expanded to 1135 μm after 1440 h immersion with a typical intergranular stress corrosion cracking (IGSCC) characteristic. For electroslag welding Alloy 690, microcracks were initiated with the length of 0.3 μm to 1.15 μm and stress corrosion crack was not observed.
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