The results showed that in different fatigue stages the measured values of microhardness obey normal probability distribution and the variances of microhardness present certain degree dispersivity.

• 研究结果表明，不同疲劳阶段，试样表面显微硬度测试值呈正态分布，显微硬度方差在整个疲劳过程中始终呈现较大的离散性。