The piston rod of family sedan's rear snubber fractured duringearlier stage of rotary bending fatigue test.
家轿后减振器活塞杆在进行旋转弯曲疲劳试验时出现早期断裂。
Results showed that ferrite net and lower hardness due to low cooling rate, coarser finish machining resulted in the fracture during earlier stage of rotary bending fatigue test.
结果表明，冷却不足使组织中出现网状及小块状铁素体，导致硬度偏低，加之磨削加工痕迹较粗是引起前轮毂早期断裂的原因。
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