8Cr4Mo4V材料钢球滚动接触疲劳试验研究

为了评价当前工艺水平航空主轴承用8Cr4Mo4V材料钢球滚动接触疲劳性能，以9.525 mm直径的8Cr4Mo4V材料钢球为研究载体，采用五球疲劳试验机开展不同应力水平下接触疲劳试验，对试验失效钢球通过失效模式与失效断口演变形式分析，确定试验数据有效性，同时提出简单程序数据处理方法对试验数据进行分析，获得不同失效概率下的钢球疲劳寿命并形成P-N疲劳曲线。结果表明:当前工艺水平航空主轴承用8Cr4Mo4V材料钢球滚动接触疲劳寿命是国外1992年试验国外材料钢球疲劳寿命的3倍以上；通过对9.525 mm直径8Cr4Mo4V材料钢球疲劳试验数据分析，求解出应力寿命函数的待定系数，可预测出不同应力水平下的接触疲劳寿命。

Rolling Contact Fatigue Test Research of 8Cr4Mo4V Material Steel Ball

In order to evaluate the rolling contact fatigue performance of the current technological level 8Cr4Mo4V material steel ball in the aviation main bearing, using a 9.525 mm diameter 8Cr4Mo4V material steel ball as the research carrier, the contact fatigue test under different stress levels are carried out by a five-ball fatigue testing machine. The test data is effective by analysis of steel ball failure modes and failure fracture evolution. At the same time, in order to analyze the test data, a simple program processing method is proposed, and obtain the different failure probability fatigue life and P-N fatigue curve of the steel ball. The results show: The rolling contact fatigue life of steel balls of 8Cr4Mo4V material used in aviation main bearings of current technological level is more than 3 times of the fatigue life of steel balls of foreign materials tested abroad in 1992. Through the analysis of the fatigue test data of the 9.525 mm diameter 8Cr4Mo4V material steel ball, the undetermined coefficient of the stress life function is solved, and the contact fatigue life under different stress levels can be predicted.