Cemented carbide and its preparation method

Abstract

The invention discloses a cemented carbide and a preparation method thereof. The alloy structure contains three phases: α phase, β phase and γ phase; the α phase is WC grain; the β phase is (Ti, W, Ta) C phase; the γ phase is Co(Ni, Cr) phase; the average grain size of the α phase is 2.0 to 4.0 μm; the average grain size of the β phase is 0.5 to 1.5 μm, and the number of grains of the β phase accounts for about two kinds of grains of the α phase and the β phase 10% to 40% of the total quantity. A cemented carbide product with excellent comprehensive performance was obtained. The alloy material has the characteristics of high temperature resistance, wear resistance, crack resistance, steel sticking resistance and plastic deformation resistance while ensuring good strength and toughness.

Description

technical field [0001] The invention relates to a cemented carbide, in particular to a novel cemented carbide roller ring material for rolling steel, and the invention also includes a preparation method of the cemented carbide. Background technique [0002] In the field of steel rolling, especially in high-speed wire rolling, cemented carbide roll rings are important consumable spare parts, and have become standard accessories for high-speed wire rolling mills since the 1960s and 1970s. [0003] With the advancement of steel rolling technology, there are more and more types of steel products, the demand for difficult-to-roll steel types is increasing, and the requirements for product quality are also getting higher and higher. Common carbide roll ring materials are increasingly unable to meet the needs Require. Especially when rolling high-strength and high-hardness special steels such as high-carbon steel and alloy steel, the rolling force is large and the roll stickiness ...

AI Technical Summary

Problems solved by technology

[0008] As we all know, in WC-Co cemented carbide, adding TiC, TaC and other high-melting carbides is beneficial to improve the high-temperature performance and chemical stability of the alloy. However, many practices have shown that the addition of TiC and TaC will significantly reduce the strength and toughness of the alloy. , therefore, generally the amount of TiC, TaC, etc. added cannot exceed 0.3wt.%

For cemented carbide roll rings used in special steel rolling, the high-temperature mechanical properties and chemical stability of the material are very important. Adding a small amount of TiC, TaC, etc. will only improve the high-temperature performance of the roll ring to a limited extent and cannot meet the expectations of use. It is still a technical difficulty to significantly improve the high temperature performance and chemical stability of the roller ring without significantly reducing the strength and toughness.

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