研究不同等温处理工艺对电渣重熔冶炼得到的辙叉用新型贝氏体钢滚动接触疲劳性能的影响。结果表明,经等温处理后,试样接触疲劳性能有不同程度的提高,且随着等温温度的降低,接触疲劳性能呈现出先增大后减小的趋势;在400℃下等温时,试样的滚动接触疲劳性能最好。通过对失效断口形貌分析,发现辙叉用新型贝氏体钢主要失效形式为麻点剥落和浅层剥落,且同一试样可能同时出现两种剥落形式。 The effect of different isothermal treatment processes on the rolling contact fatigue properties of frog with new bainitic steels obtained by ESR was studied. The results show that after the isothermal treatment, the contact fatigue performance of the sample increases to some extent, and with the decrease of the isothermal temperature, the contact fatigue performance first increases and then decreases; at 400 ℃ under isothermal, the sample’s Rolling contact fatigue performance best. Through the analysis of failure fracture morphology, it is found that the main failure modes of new bainitic steels for frog are pitting and shallow spalling, and the same sample may have two types of spalling at the same time.