Laser heat treatment is a method of using high-power density laser beams for surface treatment of metals. It can achieve phase change hardening (also called surface quenching, surface amorphization, surface remelting and quenching), surface alloying and other surfaces. Modification treatment produces changes in surface composition, structure and performance that cannot be achieved by quenching with its large surface. After laser treatment, the surface hardness of cast iron can reach above 60 degrees HRC, and the surface hardness of medium-carbon and high-carbon carbon steel can reach above HRC70 degrees, thereby improving wear resistance, fatigue resistance, corrosion resistance, oxidation resistance, etc. Its service life. Compared with other traditional heat treatment such as high frequency quenching, carburizing, nitriding, laser heat treatment technology has the following characteristics:
1. No need to use additional materials, only change the structure of the surface of the material to be treated. The modified layer after treatment has enough thickness, and the depth can be adjusted as needed, generally up to 0.1-0.8mm;
2. The treatment layer and the substrate have high bonding strength. The laser surface treatment of the modified layer and the substrate material is a dense metallurgical bond, and the surface of the treatment layer is a dense metallurgical structure with high hardness and wear resistance;
3. The deformation of the processed part is extremely small. Due to the high laser power density and the short interaction time with the part (10-2-10 seconds), the thermal deformation zone and overall change of the part are very small. Therefore, it is suitable for high-precision parts processing as the final processing procedure of materials and parts;
4. Good processing flexibility and wide application range. The flexible light guide system can freely guide the laser to the processing part, so that deep holes, inner holes, blind holes and grooves can be conveniently processed, and selective local processing can be performed.