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用恒负荷试验研究了18-8Ti和17-12Mo。钢在腾沸42％MgCl_2中的应力腐蚀破裂过程。考察了钢的持久蠕变行为。进行了模拟原电池试验和预蠕变试样的应力腐蚀试验。结果表明:奥氏体不锈钢在沸腾42％MgCl_2溶液中应力腐蚀破裂是形变活化和再钝化协合、相竞作用的结果。很难把破裂过程区分为不同质的阶段。根据不同参量确定的诱导期常不一致。裂纹在扩展初期主要是数量增多,继而沿长度和深度扩展。裂纹扩展期与外加应力大体有指数关系。两种钢的腐蚀断裂均为穿晶-晶间型;18-8Ti钢以穿晶为主,17-12Mo钢以晶间为主。
18-8Ti and 17-12 Mo were studied with a constant load test. Stress Corrosion Cracking of Steel in Boiling 42% MgCl_2. Inspected the steel’s long-term creep behavior. The stress corrosion tests of the prototype primary battery and the pre-creep samples were carried out. The results show that the stress corrosion cracking of austenitic stainless steel in boiling 42% MgCl 2 solution is the result of synergistic and regulative effect of deformation activation and reactivation. Difficult to distinguish the rupture process into different stages of quality. According to different parameters to determine the induction period is often inconsistent. Crack in the early expansion of the main increase in the number, and then along the length and depth of expansion. The crack propagation period has an exponential relationship with the applied stress. The corrosion and fracture of the two kinds of steel are both transcrystalline and intergranular. The main grain of 18-8Ti steel is transgranular and the intergranular is the main material of 17-12Mo steel.