美国心脏协会用一个“心部裂纹”的标记装饰某种产品。
The American heart Association adorns certain products with a "heart check" mark.
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.
这种方法不仅容易在锻件心部产生层状裂纹，而且浪费了大量原材料和加工工时。
This method frequently caused the layer-shaped cracks in the center of the forgings, and also wasted a large number of the raw materials and working hours.
应用推荐