Die heat treatment hardness is a very important mechanical property index, because it can comprehensively reflect the strength, plasticity, elasticity, wear resistance and other mechanical properties of materials. The insufficient or uneven hardness of the die after heat treatment will reduce the wear resistance and fatigue strength of the die, lead to the early failure of the die, seriously reduce the service life of the die, thus reducing the production efficiency and increasing the cost burden. Therefore, the unqualified hardness of die is a very serious defect.

模具硬度不足或不匀的产生原因是什么?该如何?相信这些问题也曾困扰过我们模材学院的朋友们。今天，51模材学院为您整理了这方面的信息，一起来了解一下吧。

What is the cause of insufficient or uneven hardness of the mold? How to solve it? I believe these problems have troubled our friends in the school of mold materials. Today, 51 mold material college has sorted out this information for you. Let's have a look.

模具硬度不足的产生原因及方法：

Causes and solutions of insufficient hardness of die:

1.模具截面大，钢材淬透性差，如大型模具选用了淬透性低的钢种。

1. The cross section of the die is large, and the hardenability of the steel is poor. For example, the steel with low hardenability is selected for the large die.

方法：正确选用模具钢种，大型模具应选用淬透性高的高合金模具钢。

Solution: the correct choice of mold steel, large mold should choose high hardenability of high alloy mold steel.

2.模具钢原始组织中碳化物偏析严重或组织粗大，钢中存在石墨碳和碳化物偏析。

2. Carbide segregation is serious or coarse in the original structure of die steel, graphite carbon and carbide segregation exist in the steel.

方法：加强原材料检查，确保原材料符合标准。对不好原材料钢材进行合理的锻造并进行球化退火处理，确保获得良好的组织。碳素工具钢不易多次退火，以防石墨化。

Solution: strengthen the inspection of raw materials to ensure that the raw materials meet the standards. Reasonable forging and spheroidizing annealing are carried out for the steel with poor raw materials to ensure good microstructure. Carbon tool steel is not easy to be annealed many times to prevent graphitization.

3.模具锻造工艺不正确，锻造后未进行很好的球化退火，使模具钢球化组织不好。

3. The forging process of the die is not correct, and the spheroidizing annealing is not carried out well after forging, so that the spheroidizing structure of the die steel is not good.

方法：严格执行锻造工艺和球化退火工艺，保证有良好的预备热处理组织。

Solution: strictly implement forging process and spheroidizing annealing process to ensure good preparation heat treatment structure.

4.模具表面未除净退火或淬火加热时产生的脱碳层。

4. The decarburization layer produced during annealing or quenching heating is not removed from the die surface.

方法：热处理前应彻 底清 除模具表面的锈斑和氧化皮，并注意加热时的保护，尽量采用真空加热淬火或保护气氛加热淬火，盐浴加热时应进行良好的脱氧处理。

Solution: before heat treatment, the rust and oxide scale on the mold surface should be completely removed, and the protection during heating should be paid attention to. Vacuum heating quenching or protective atmosphere heating quenching should be adopted as far as possible, and good deoxidation treatment should be carried out during salt bath heating.