Surface metallurgy technique for cobalt-containing super-hard high-speed steel

Abstract

The invention relates to a surface metallurgy process of cobalt containing super-hard high-speed steel, which pertains to the surface metallurgical field. The invention is characterized in that: first, a double-layer glow discharging ion metallic cementation technique is used for filtering an alloying element on the surface of Fe-based material with lower cost so as to form a surface alloying layer; then, a carburizing treatment is carried out to form a surface high-speed steel alloying layer; thereafter, a thermal treatment is carried out to lead the surface high-speed steel alloying layer to have the excellent properties of the super-hard high-speed steel. The hardening characteristics of the super-hard high-speed steel is that fine and dispersed alloy carbide and intermetallic compound are precipitated to generate hardening, the surface hardness of the filtered workpiece reaches at 1000-1150HV after quenching and tempering treatment. The invention has the advantages that: since coarse primary carbide is not formed during the crystallizing process, formidable inhomogeneous carbide in the traditional production of smelting, forging-rolling high-speed steel is solved. Fine and dispersed carbide on the surface metallurgical high-speed greatly improves the hardening effect, saves a great deal of alloying elements, reduces the cost and is capable of being widely used for manufacturing cutting tools of various machine tools.

Description

1. Technical field [0001] The surface metallurgy process of the cobalt-containing superhard high-speed steel of the present invention belongs to the category of surface metallurgy. Specifically, it is a solid surface metallurgical process for cobalt-containing superhard high-speed steel. 2. Background technology [0002] The currently used cobalt-containing superhard high-speed steel is formed by smelting from liquid to solid crystallization and undergoing certain heat treatment. Due to its high hardness, red hardness and wear resistance, superhard high-speed steel has attracted more and more attention from people. This kind of high-performance ultra-hard high-speed steel has accounted for 20%-25% of the total high-speed steel in Europe and the United States, but in my country, due to the lack of cobalt resources and high prices, the production of cobalt-containing high-speed steel is very small, less than 1%. Therefore, the needs of the tool industry to manufacture high-pe...

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Problems solved by technology

The published Chinese patent CN87104358.0 utilizes double-layer glow ion metallization technology to form a high-alloy layer and then carries out carburizing and quenching treatment. However, the infiltrated alloy does not contain cobalt and cannot reach ultra-high hardness.