高速列车车轴材料的低温高周疲劳性能

The current design standard of high speed axle is based on high cycle fatigue "safe life" methodology, but does not consider the high cycle fatigue behavior of axle materials under low temperature service environment. In this paper, the high cycle fatigue properties of import axle steel EA4T at room temperature and at low temperature and the high cycle fatigue properties of domestic axle steel DZ2 at low temperature were tested by using a low temperature rotating bending fatigue machine, and the fatigue stress-life curves and probabilistic stress life curves were obtained. The results show that the high cycle fatigue property of the axle steel EA4T at low temperature is better than that of at room temperature, and the high cycle fatigue properties of the axle steel DZ2 is similar to that of the axle steel EA4T at low temperature. The fatigue cracks initiate on the surface and the propagating path of cracks are transgranular.