heat-treatment defects 热处理缺陷
First kind refers to hardening heat treatment defects cracks, or quenching cracks.
第一类热处理缺陷指淬火裂纹。
Foundry method, melting process, heat treatment process for nodular iron crankshaft was introduced and the measures to prevent common defects were described.
介绍了球墨铸铁曲轴的铸造方法、熔炼工艺和热处理工艺，同时描述了预防一般缺陷的措施。
These defects can be reduced or elimination by adjusting proportion of the raw material charge or adopting other casting technologies and heat treatment.
但也存在着铸件增碳、夹渣等新问题，需要从调整炉料配比，以及采用其他铸造和热处理的工艺措施来加以解决。
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