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。
The stress corrosion cracking(SCC)process of 18-8Ti and 17-12Mo stainless steel in boiling 42％ MgCl_2 solution was studied by using constant load tests. The endurance creep behavior of these steels was examined. Simulated galvanic cell tests and stress corrosion tests using pre-creeping specimens were conducted. The results suggested that SCC of austenitic stainless steels in boiling 42％ MgCl_2 solution results from synergism and competition between deformation-enhanced activation and repassivation of surface films. It is rather difficult to divide the cracking process into essentially different periods, The induction periods obtained with various parameters tend to be inconsistant At the early stage of crack propagation period(tp), it is the number of cracks that increases mainly, after which cracks propagate along the length and depth. The tp-σ(applied stress)relation seems to follow an exponential law. The SCC of both steels is transgranular(TC)-intergranular(IC); TC is predominantly observed in 18-8Ti steel, while IC prevails in 17-12Mo steel.
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