The result reveals that the practical secondary cooling system is not suitable and easy to cause quality defects such as internal crack.

结果表明，目前的二冷制度不甚合理，易产生内裂纹等质量缺陷。

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Bearing parts in the process of hardening cooling by internal stress due to the formation of quenching cracks crack said.

轴承零件在淬火冷却过程中因内应力所形成的裂纹称淬火裂纹。

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Ceramicss are not typically formed from the melt. This is because most ceramics will crack extensively (i. e. form a powder) upon cooling from the liquid state.

陶瓷一般不是由熔化形成的。因为大多数陶瓷在从液态冷却时将会完全破碎(即形成粉末)。

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