心部缺陷
Heart defect
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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.
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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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