How much do you know about the hardness, wear resistance and red hardness of cemented carbide
Time:2023-07-10
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How much do you know about the hardness, wear resistance and red hardness of cemented carbide
(1) High hardness, wear resistance and red hardness
(1) High hardness, wear resistance and red hardness
The hardness of cemented carbide at room temperature can reach 86~93HRA, which is equivalent to 69~81HRC. It can maintain high hardness at 900~1000°C and has excellent wear resistance. Compared with high-speed tool steel, the cutting speed can be 4~7 times higher, the service life is 5~80 times longer, and it can cut hard materials with a hardness up to 50HRC.
(2) High strength and elastic modulus
The compressive strength of cemented carbide is as high as 6000MPa, and the modulus of elasticity is (4~7)×105MPa, both of which are higher than those of high-speed steel. But its bending strength is low, generally 1000~3000MPa.
(3) Good corrosion resistance and oxidation resistance
Generally, it can resist the corrosion of atmosphere, acid, alkali, etc., and is not easy to oxidize.
(4) The coefficient of linear expansion is small
When working, the shape and size are stable.
(5) Shaped products are no longer processed and regrinded
Due to the high hardness and brittleness of cemented carbide, no cutting or regrinding will be carried out after powder metallurgy forming and sintering. When special reprocessing is required, only electrical processing such as electric spark, wire cutting, electrolytic grinding or special grinding wheel grinding can be used. cut. A product of a certain specification usually made of cemented carbide, which is used on the cutter body or mold body by brazing, bonding or mechanical clamping.
Anna Ling
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