Preparation method of high-entropy cladding coating for improving surface strength and toughness of die steel

Abstract

The invention discloses a preparation method of a high-entropy cladding coating for improving the surface strength and toughness of die steel, and belongs to the technical field of die materials. Theproblems that existing die steel is short in service life and limited in use condition due to the fact that the surface hardness and toughness cannot meet the requirements at the same time are solved.Specifically, a material composed of WC, Cr, graphene and die steel powder in a certain mass ratio is adopted, and induction cladding, vacuum heating, surface quenching, low-temperature tempering andnitriding treatment are sequentially carried out to obtain a die steel coating. According to the method, a mode of combining induction cladding and special heat treatment is utilized, the structure of each part of the die steel is idealized in the heat treatment process, a formed cladding layer is tempered martensite, the core of the die steel is a sorbite structure, the surface strength and hardness of the die steel are improved, the overall toughness of the die steel is improved, the service life of the die steel is prolonged, and the use conditions of the die steel are improved.

Description

technical field

[0001] The invention belongs to the technical field of mold materials, in particular to a method for preparing a high-entropy cladding coating for improving the surface strength and toughness of mold steel. Background technique

[0002] As we all know, the quality of the mold directly affects the quality of the pressure processing process, the precision output of the product and the production cost, and the quality and service life of the mold are mainly affected by the mold material and heat treatment in addition to the reasonable structural design and processing accuracy. Among them, the steel used for cold working dies should have high hardness, strength, wear resistance, sufficient toughness, high hardenability, hardenability and other process properties according to the working conditions of the manufactured tools. However, in the actual operation process, mold steel often has defects such as fracture, deformation, and wear, which cause the workpiece and...