合理的热处理工艺消除了残余应力，提高了机加工精度。
The rational heat treatment diminishes the residue stress and improves the precision of machining.
另一方面，热处理工艺不当使得铸造应力及机加工的残余应力无法彻底消除，这样加剧了裂纹的产生和扩展。
On the other hand, the improper heat treatment operation can not completely relieve the casting stress and remnant stress, and further enhances generation and expansion of cracks.
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