本文系统地研究了AISI4340,HY100,WELTEN60,AISIA537和A131低合金钢在开路和阴极保护电位下海水中的应力腐蚀开裂(SCC)和腐蚀疲劳(CF)行为.试验结果表明,阴极保护可以使合金钢在海水中不发生SCC的界限强度降低;而对低合金钢在海水中CF裂纹扩展速率的影响则不是单一的,与其强度及SCC的行为密切相关.指出在海洋工程结构中,应尽可能把阴极保护电位控制在规定区域的上限,同时可把海洋平台用钢的强度提高200—300MPa
Fracture behaviour of low-all oysteels AISI4340, HY100, WELTEN60, AISIA537 and A131 in artificial seawater under static, cyclic loading and cath-odic protection potential has been investigated by using fracture mechanics, elec-trochemistry and electronfractography. The results reveal that under hydrogen evo-lution potential (cathodic protection potential) the critical yield strength requiredfor the occurrence of SCC decreases from 985 to 872MPa comparing with corrosionpotential (E_c). The effect of cathodic protection on crack propagation of CF is notsimple, it is closely related to the yield strength of steels and their SCC behaviour.For the steels with high yield strength, cathodic protection promotes da/dN
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