The results show that metallurgical defect is the main reason leading to early formation of fatigue crack under normal working stress.
认为，该曲轴材料的冶金缺陷是导致疲劳裂纹在正常工作应力下过早形成的原因。
Pointing out the main reason of crack formation is that casting blank is not up to standard and the strength of parts is not enough.
指出铸造的毛坯件不合格及零件本身强度不高是产生裂纹的主要原因。
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