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本文研究了315℃水中304、304L 型不锈钢,因科镍—600,因科洛依—800和蒙乃尔—400的应力腐蚀开裂,水中含0.6PPM 的铅和0.05PPM 或8.0PPM 的氧;或不含铅而含有0.05PPM 或8.0PPM 的氧。经1600小时试验,其结果表明:在工厂退火,冷加工25%和消除应力(675℃,1小时)条件下,304L 型不锈钢、因科洛依—800和蒙乃尔—400具有抗裂纹性。高应力的因科镍—600,与水中铅和氧的含量无关、发生了晶间破裂。发现因科镍—600在600℃温度下经24小时热处理或接着退火以后,耐应力腐蚀开裂。在600℃的有效热处理过程中晶界上产生了半连续析出物。此外,这种热处理似乎稳定了因科镍—600微观组织,这可以以机械性能、吸氢和电化学行为的变化间接地看出。还讨论了微观组织变化对应力腐蚀开裂的影响。
In this paper, 304,304L stainless steel in 315 ℃ water, Inconel-600, stress corrosion cracking due to Colloidal-800 and Monel-400, 0.6PPM lead and 0.05PPM or 8.0PPM oxygen in the water, or Contains no lead and contains 0.05PPM or 8.0PPM of oxygen. After 1,600 hours of testing, the results showed that the 304L stainless steel was crack-hardened due to the Coroel-800 and Monel-400 at factory annealing, cold working 25% and stress relief (675 ° C, 1 hour). High-stress Inconel-600, has nothing to do with the content of lead and oxygen in water, intergranular rupture occurred. It is found that Inconel-600 is resistant to stress corrosion cracking after being heat-treated at a temperature of 600 ° C for 24 hours or after annealing. Semi-continuous precipitates were produced on the grain boundaries during the effective heat treatment at 600 ° C. In addition, this heat treatment appears to stabilize Inconel-600 microstructure, which can be indirectly seen in terms of changes in mechanical properties, hydrogen absorption and electrochemical behavior. The effects of microstructure changes on stress corrosion cracking are also discussed.