The hardness of the heat treatment product of reduced iron powder metallurgy
Hardness related factors of powder metallurgy products.
The density, pore, material and heat treatment of iron base powder metallurgical products with reduced iron powder directly affect the hardness.
High density, high porosity, high hardness and high hardness.
The heat treatment method generally has carburizing and quenching, high frequency quenching, low frequency quenching, oil quenching, etc., stable and qualified quenching process keeps the hardness of heat treatment stable.
Heat treatment hardness control of powder metallurgical products:
Ordinary reducing iron powder, density at 6.5~6.7, quenching hardness can be controlled to HRC30.
General atomized powder (including carbon steel and copper alloy steel), density 6.9, quenching hardness can be controlled to HRC30.
General prealloyed powder (AB powder), density 6.95, quenching hardness can be controlled to HRC35.
High prealloyed powder (AE powder), density 6.95, quenching hardness can be controlled to HRC40.
The density and material stability of the powder metallurgy products of the above materials are stable and the heat treatment hardness reaches the corresponding requirements. Therefore, the tensile strength and compressive strength of the products will reach a good peak.
The disadvantage of high hardness of powder metallurgy.
Generally, the products of iron base can not be heated too high, especially in the iron powder metallurgy gear. If the hardness HRC40 is processed, it will be more brittle.
If the force is applied, it will break easily.
This is because the powder metallurgy suppressing a general compact density is about 6.5 ~ 6.7, the density is lower than 7 after heat treatment, when the powder metallurgy mandatory carburizing or high frequency close to 45 steel heat treatment, can make the powder metallurgy products due to high hardening brittleness, leading to low intensity of powder metallurgy products.
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