恒位移试样测量表明,40CrMo钢在3.5%NaCl水溶液中应力腐蚀(SCC)门槛应力强度因子KISCC随屈服强度σs指数下降.即KISCC=1.38×106exp(-8.26×10-3σs).动态充氢时氢致开裂(HIC)门槛应力强度因子KIH随试样中可扩散氢浓度C0(10-6)的对数而线性下降,即KIH=31.1-9.1 ln C0.SCC时也遵循这个规律发生HIC型SCC的临界氢浓度Cth随σs指数下降,从而可导出KISCC=aκexp(-k2σs),其中a=3RT√πρ/2(1+v)VH,RT是热能,ρ是裂纹止裂时的曲率半径,VH是氢在钢中的偏摩尔体积,v为Poission比,k1和k2则是和成分及组织有关的常数.
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