用改进的WOL型试样研究了Cr-Mo-V系高强度钢在3.5%NaCl水溶液中的应力腐蚀断裂行为,并与常用的42CrMo钢进行了对比.结果表明,回火温度对实验钢的应力腐蚀开裂行为有显著影响.当回火温度较低时,Cr-Mo-V钢的KISCC较低,且随回火温度的升高缓慢提高,断裂方式主要为沿晶断裂;当回火温度超过约873 K后,KISCC显著提高,断口中穿晶断裂所占的比例明显增加,断裂方式逐渐转变为穿晶型断裂为主.在相同的强度水平下,Cr-Mo-V钢的KISCC高于42CrMo钢,且在低强度水平下二者差别较大.对42CrMo钢,KISCC随屈服强度升高呈指数下降.但对Cr-Mo-V钢,则并非如此,即在强度保持不变(RP0.2=1410～1440MPa)的条件下,KISCC随回火温度升高而明显提高.Cr-Mo-V钢和42CrMo钢的KISCC均随回火温度的升高呈指数关系增加.
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