Based on the experimental result, we draw the conclusion that the fatigue of the bar is influenced by the shape of the hardened area. A hardened area that has a small axial dimension and a relatively large radial dimension facilitates the fatigue.

• 通过分析实验结果得到 :棒料的疲劳受硬化区形状影响 ；具有较小轴向尺寸和较大径向尺寸的硬化区会促进疲劳 .