The metallographic structure of the material can be changed through heat treatment to ensure the necessary strength and hardness, dimensional stability at high temperatures, thermal fatigue resistance and cutting performance of the material. Parts after heat treatment are required to have little deformation, no cracks and minimize the presence of residual internal stress.
The quality of heat treatment plays a very important role in the service life of the die-casting mold. Improper heat treatment will often lead to mold damage, cracking and premature scrapping. Using vacuum or protective atmosphere heat treatment can reduce decarburization, oxidation, deformation and cracking.
After quenching, formed parts should be tempered two or more times. Practice has proved that if the process of only quenching and tempering (without quenching) and then surface nitriding is used, surface cracks and cracks will often appear after thousands of die castings, and the mold life will be short.
Link to this article：Effect of heat treatment on die casting mold life
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