Treatment method for improving mold steel surface frictional wear resistance

Abstract

The invention belongs to the field of advanced material surface modification treatment, in particular to a treatment method for improving mold steel surface frictional wear resistance. The treatment method is characterized in that a boriding layer is formed on the surface of mold steel; and then, the laser quenching is performed on the boriding layer to eliminate defects of the boriding layer so as to improve the frictional wear resistance of the boriding layer. Hole and piece structures on the surface of the boriding layer are reduced after the laser quenching treatment, so that the stress concentration can be effectively prevented, the strength and the toughness of the boriding layer are improved, the defects of easy wear and stripping of the boriding layer are solved, and the mold service life is prolonged.

Description

technical field [0001] The patent of the present invention is a method for improving the wear resistance of boronizing layer by laser quenching. Boronizing treatment is widely used in industrial production, because after boriding treatment, a boronizing layer containing borides is formed on the surface of the material, which has high hardness and is resistant to wear. Corrosion and other advantages, but the boronizing layer usually has defects such as pores, which is prone to shedding during the wear process. Laser quenching is used to compound the boriding layer to form an optimized boronizing layer, which can reduce cracks and cracks caused by boronizing. Pores further improve the friction and wear resistance, which is conducive to prolonging its service life. This patent proposes to use laser quenching to improve the wear resistance of the boronizing layer, which belongs to the field of surface modification of advanced materials. Background technique [0002] In the mecha...

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Problems solved by technology

[0002] In the mechanical and electrical industry, more than 70% of the parts are processed by molds, and the failure rate of cold-work die steel is as high as 50%-80% due to wear. Therefore, it is necessary to modify the surface of the die steel to improve its service life; boronizing treatment is widely used in In the industry, after boronizing the steel, a certain thickness of FeB+Fe can be obtained on the surface of the part. 2 B The iron-boron compound layer composed of two-phase or single-phase makes the boronizing layer have high hardness and wear resistance; but the boronizing treatment has the following defects: (1) The boronizing layer has high hardness, and at the same time It also has high brittleness, and it is prone to peeling and wear during use; (2) The boronizing layer generally contains FeB and Fe 2 B dual-phase borides, the expansion coefficients of the two are different, which may lead to bonding failure; (3) Pores and other defects will be formed during the boronizing process, which will easily cause stress concentration, lead to the formation and expansion of cracks, and easily cause surface shedding or even fracture. Problems limit application of boriding process

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