结果表明：该曲轴硫化物夹杂偏多、组织偏析导致曲轴强度和硬度偏低，引起曲轴疲劳断裂。
The results indicate that the low strength and hardness, resulting from the Sulfide inclusions and organizational segregation, led to the crankshaft fatigue fracture.
内燃机曲轴在设备运行过程中的疲劳断裂是造成事故的重要原因。
Fatigue fracture of internal combustion engine crank is important reason of accident in the process of equipment operation.
球墨铸铁曲轴未经过氮化处理，表面疲劳强度低是导致曲轴断裂的原因；
Nodular cast iron crank shaft which has not been processed by adding nitrogen, its surface fatigue strength is lower, this is the reason that results in the fracture.
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