What is the thermal hardness of cemented carbide?
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Release Time:
2023-01-11
The reason why cemented carbide (cemented carbide) can be widely used in aerospace, aviation, navigation, consumer electronics, national defense, military industry, medical treatment, automobile and other fields is that it has excellent physical and chemical properties, namely, high specific gravity, high hardness, high strength, good thermal hardness, wear resistance, heat resistance, acid and alkali resistance. What is the thermal hardness of cemented carbide?
Carbide tool
Thermal hardness refers to the ability of cemented carbide material to maintain high hardness at high temperature, and its value shall be tested with hardness standard block or hardness tester at high temperature. The hardness of common cemented carbide is 86~93HRA (equivalent to 69~81HRC), while the hardness of the alloy remains basically unchanged at 500 ℃, and still has a high hardness at 1000 ℃, about 60HRC.
Due to its high thermal hardness and fatigue resistance, good wear resistance and oxidation resistance, cemented carbide is often used to manufacture long-life hot working dies, such as hot forging dies, hot extrusion dies, die-casting dies, hot upsetting dies, hot punching dies, hot flat forging dies, etc. For example, the hot upsetting and extruding die for the air valve tappet made of 3Cr2W8V steel has a hardness of about 50HRC after heat treatment and has been used for 5000 times. After that, some parts of the die are replaced with YG20 cemented carbide inserts, and the number of times the die has been used has increased to 150000 times. The service life of the hot trimming die made of YG20 cemented carbide insert is increased to more than 100000 pieces.
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