压圈原材料中心疏松及锭型偏析是导致裂纹形成的主要原因。
The results showed that central porosity and ingot shape segregate were the major causes of the cracking.
裂纹形成的断裂为穿晶解理机制，预应变可导致更多的二次裂纹。
The fractography of the fatigue crack initiation displayed cleavage facet and more second cracks after pre-training.
结果表明，失效形貌呈典型的接触疲劳特征，两种疲劳裂纹形成模式同时存在。
The results showed that failure morphology was of typical contact fatigue characteristics, and two modes of fatigue crack formation worked.
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