A method for surface modification of metal materials with high strength and toughness

Abstract

The invention discloses a method for modifying the high-toughness surfaces of metal materials, relating to a surface modification technique for materials. The method comprises the following main steps: 1) pretreating the surface of a metal material; 2) carrying out laser shot blasting treatment on the pretreated surface of the material; 3) carrying out magnetic field nitriding on the surface subjected to laser shot blasting treatment; 4) carrying out magnetic field quenching on the surface subjected to nitriding; 5) carrying out low-energy laser shot blasting treatment on the surface subjected to magnetic field quenching; 6) carrying out magnetic field quenching again on the surface subjected to low-energy laser shot blasting treatment, so that a flat high-toughness surface is obtained. According to the invention, the grain structure of a surface can be effectively refined, the thickness of a nitriding layer can be increased, the nitriding time can be shortened, the brittleness of the nitriding layer can be reduced, and the toughness of the surface can be improved. The method disclosed by the invention is simple in technological process, easy in operation, high in efficiency, and suitable for mass production in a large scale.

Description

technical field

[0001] The invention relates to the technical field of surface modification of metal materials, in particular to a method for surface modification of metal materials with high strength and toughness. Background technique

[0002] The failure of metal parts often originates from its surface, such as corrosion, wear, fatigue and other damages all start or occur on the surface. Therefore, improving surface properties has become an important method to prevent component failure and prolong its service life. Surface modification technology is an effective means to improve the surface properties of materials. It achieves the purpose of improving the surface properties of materials by improving the composition and microstructure of the material surface. At present, the most widely used surface modification technologies include laser surface modification, nitriding, carburizing, spraying, vapor deposition and other methods, but these methods usually make the surface ...