中文摘要：

研究了原子氢和白点对车轮钢冲击韧性和疲劳性能的影响．结果表明,可扩散氢浓度较低（C0≤0.7×10^-6）时、氢对冲击韧性及疲劳性能没有影响,白点降低冲击韧性并且使冲击韧性值的波动范围增加;当可扩散氢浓度较高（C0≥2．5×10^-6）时,氢能促进疲劳裂纹的形核和扩展,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．

英文摘要：

The effects of hydrogen and flakes on impact toughness and fatigue properties of a wheel steel have been investigated. The results show that when the diffusible hydrogen concentration is low （C0≤0.7×10^-6）, atomic hydrogen has no effects on impact toughness and fatigue properties, the flakes decrease impact toughness and make it fluctuate; When the diffusible hydrogen concentration is high enough （C0≥2.5×10^-6）, atomic hydrogen can promote the initiation and growth of fatigue cracks, the flakes increase the fatigue crack growth rate and make it fluctuate.