在国产 EA4T 车轴钢上截取光滑和缺口疲劳试样，按照 EN13261－2009标准测试了其旋转弯曲疲劳性能，并观察了断口形貌。结果表明：国产 EA4T 车轴钢的光滑和缺口疲劳强度均满足 EN13261－2009的要求，缺口试样的疲劳强度比光滑试样的低30％左右；光滑试样的裂纹萌生于试样表面，呈单源开裂，缺口试样的裂纹萌生于缺口根部，呈多源开裂；未断缺口试样的缺口根部存在非扩展性裂纹。
The rotating bending fatigue property of smooth and notched specimens cut from domestic EA4T axle steel was tested according to the standard of EN13261 -2009 and the fracture morphology was observed.The results show that the fatigue strength of the domestic EA4T axle steel met the requirements of EN13261 -2009, and the fatigue strength of the notched specimen was 30% less than that of the smooth specimen;the rotating bending fatigue cracks initiated from a single source on the surface of the smooth specimen,while the cracks in notched specimen were originated from several points around the notch root;non propagating cracks were also observed at the notch root of the non fractured notched specimen.
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