按照GB/T4337对DZ2车轴钢-40℃下的旋转弯曲疲劳试样断口形貌进行了扫描电镜观察,分析了在施加不同应力作用下断口的裂纹起源区,扩展区瞬断区。
According to GB / t4337, the fracture morphology of rotating bending fatigue specimen of dZ2 axle steel at - 40 ℃ was observed by scanning electron microscope. The crack origin area, propagation area and instantaneous fracture area of the fracture under different stress were analyzed.