制备了3种不同氢含量的高强弹簧钢50CrV4样品 (淬火、回火样品，0.6×10 -6；真空 退火样品，0.2×10 -6；高温 高压热充氢样品，2.5×10 -6). SEM观察表明，疲劳断口内部起裂 源为小夹杂团簇; 疲劳强度测试表明，随氢含量(c)的增加，疲劳强度基本上按 σ0-αexp(c)规 律降低, Basquin方程中的Basquin指数随氢含量的增加有明显变化.
The influence of hydrogen on ultra-high cycle fatigue (UHCF) properties of high strength spring steel was discussed in this study. Three groups of specimens with different hydrogen content (CH) were obtained from three different heat treatment procedures: quenched and tempered (specimen QT), annealed at 380℃ in a vacuum after QT (specimen VA) and treated by High-pressure Thermal Hydrogen Charging (HPTHC) after QT (specimen HPTHC). It was observed by SEM that the crack initiation site was internal inclusion clusters for a high cycle fatigued specimen . The fatigue strength (σw) decreased according to σ0-аexp(CH)law with the increase of CH. Basquin exponent--b in Basquin Eq. decreased gradually with the increase of CH.
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