The stress corrosion cracking behavior of alloy 600 was studied in high temperature water at 288°C to 360°C. The effects of dissolved oxygen (DO) and dissolved hydrogen (DH) on crack growth rate (CGR) are discussed. Results show that the CGR of alloy 600 in hydrogenated water (at the Ni/NiO phase boundary) is about 2-200 times higher than in 2 ppm O₂ oxygenated water at 325°C and 360°C, while the opposite behavior was observed at 288°C. Much more severe intergranular oxidation was observed at the crack tips after testing in DH water than in DO water at 325°C and 360°C. The good correlation between CGR and intergranular selective oxidation suggests that the peak CGRs in DH water might be attributed to the combined contribution of instability of the oxides and intergranular selective oxidation at the crack tip during the phase transition.

研究了600合金在288°C至360°C高温水中的应力腐蚀开裂行为。讨论了溶解氧（DO）和溶解氢（DH）对裂纹扩展速率（CGR）的影响。结果表明，合金600在氢化水中（在Ni / NiO相界处）的CGR约为2 ppm O ₂中的CGR的2-200倍分别在325°C和360°C的温度下充氧，而在288°C观察到相反的行为。在DH水中进行测试后，在325°C和360°C的情况下，在裂纹尖端观察到的晶界氧化严重得多。CGR与晶间选择性氧化之间的良好相关性表明，DH水的峰值CGR可能归因于相变期间在裂纹尖端的氧化物的不稳定性和晶间选择性氧化的共同贡献。