研究了车轮钢中白点和原子氢对冲击韧性和疲劳性能的影响。结果表明，可扩散氢浓度较低时（C0≤0.7×10-6），氢对冲击韧性没有影响。白点降低冲击韧性并且使冲击韧性值的波动范围增加。当试样中氢浓度较低（C0≤0.7×10-6）时，原子氢对车轮钢的疲劳性能没有影响。当氢浓度较高（C0≥2.5×10-6）时，氢能促进疲劳裂纹的形核和扩展。试样中的白点能增加疲劳裂纹扩展速率，并且使疲劳裂纹扩展速率发生明显的波动。
The effects of hydrogen and flakes on impact toughness and fatigue properties of a wheel steel have been investigated. The results show that atomic hydrogen has no effect on impact toughness when the diffusible hydrogen concentration is low (C0≤0.7×10-6). The flakes decrease and fluctuate impact toughness. Atomic hydrogen has no effect on fatigue properties when the diffusible hydrogen concentration is low (C0≤0.7×10-6). But atomic hydrogen can promote the initiation of fatigue cracks and increase the fatigue crack growth rate when the hydrogen concentration is high enough (C0≥2.5×10-6). The flakes increase and undulate the fatigue crack growth rate.
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