Heat treatment hardness of cemented carbide die is a very important mechanical property index, and unqualified hardness is a very serious defect. The main reasons are as follows:
(1) The cross-section of the die is large, and the hardenability of steel is poor. For example, a steel with low hardenability is selected for large-scale die.
(2) The carbide segregation in the original structure of the die steel is serious or the structure is coarse, and there is segregation and aggregation of graphite carbon and carbide in the steel.
(3) The die forging process is incorrect, and the spheroidizing annealing is not performed well after forging, which makes the spheroidizing structure of the die steel poor.
(4) The surface of the die tools has not been removed from the decarburized layer produced during annealing or quenching heating.
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