PD_3重轨钢产生氢致不可逆损伤的临界可扩散氢浓度为Co(P)=(2.07±0.49)×10~(-4)％;而产生氢致塑性损失和滞后断裂的临界值约为0.26×10~(-4)％。相对塑性和C_0~(-1)成正比,即δ_H/δ_0=-0.05+0.27/Co。氢致滞后断裂归一化门槛值为σ_(th)σ_f=0.27ln(C_(th)/Co)_2C(th)=9.5×10~(-4)％是氢致断裂的临界氢富集浓度。
Critical concentrations of diffusible hydrogen and total hydrogen for hydrogen-induced irreversible damage were C0(P)=(2.07±0.49)×10-4% and C(P)=(3.13±0.59)×10-4%,respectively. The critical concentration of diffusible hydrogen for hydrogen-induced ductility loss and delayed failure, however, was about 0.26×10-4%. The elongation ratio of the charged specimen to uncharged one was directly proportional to C0-1, i.e., δH/δ0=-0.05±0.27/C0. The normalized threshold stress for hydrogen-induced delayed failure σth/σf was σth/σf = 0.27ln(Cth/C0) where σf is the ultimate tensile strength, Cth = 9.5 × 10-4% being the critical concentration of accumulated hydrogen necessary to hydrogen-induced cracking.
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