导致剥落的疲劳裂纹开始于表面缺陷和氮化层与心部交界处。
Cracks leading to spalling were initiated at surface defects and boundaries between nitriding layes and the core.
晶体的靠近表面的区域缺陷较密集，中心部分较少。
The density of crystal defects in the region near the crystal surface is greater than that in the center.
晶体的靠近表面的区域缺陷较密集，中心部分较少。
The density of crystal defects in the region near the crystal surface is greater than that in the center.
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