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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。
The critical concentration of diffusible hydrogen in the PD_3 heavy rail steel caused by hydrogen-induced irreversible damage was Co (P) = (2.07 ± 0.49) × 10 ~ (-4)%. The critical value of hydrogen plasticity loss and delayed fracture was about 0.26 × 10 ~ (-4)%. Relative plasticity and C_0 ~ (-1) is proportional to, that δ_H / δ_0 = -0.05 +0.27 / Co. The normalized threshold value of hydrogen induced hysteresis fracture is σ_ (th) σ_f = 0.27ln (C_ (th) / Co) _2C (th) = 9.5 × 10 ~ (-4)% is the critical hydrogen concentration .