滚道下方亚表层范围内存在疲劳影响区，2%硝酸酒精浸蚀条件下，该区域内颜色同周围其他其余并不相同呈现均匀且耐腐蚀的状态。根据 Hertz 接触理论可知， 推力片滚动接触疲劳状态下，被测试样亚表层应力状态最大，即为疲劳影响区。

There is a fatigue-affected zone in the subsurface layer below the raceway. Under the condition of 2% nitric acid and alcohol etching, the color in this zone is not the same as that of the rest of the surrounding areas, showing a uniform and corrosion-resistant state. According to Hertz contact theory, under the rolling contact fatigue state of the thrust pad, the sub-surface stress state of the tested sample is the largest, which is the fatigue influence zone.