Laser fusion is a surface modification technology that irradiates the surface of a material with a laser pointer with appropriate parameters to quickly melt and condense the surface to obtain a more refined and homogeneous structure and required properties. It has the following advantages:
1. Generally, no metal elements are added when the surface is melted, and the fused layer forms a metallurgical bond with the material matrix.
2. In the laser melting process, impurities and gases can be eliminated, and the impurities obtained by quenching recrystallization have higher hardness, wear resistance and corrosion resistance.
3. The melting layer is thin and the heat action zone is small, which has little effect on the surface roughness and workpiece size. Sometimes it can be used directly without subsequent polishing.
4. Improve the solid solubility limit of the solute atoms in the matrix, the crystal grains and the second phase particles are ultra-fine, and the metastable phase can be formed to obtain a single crystal structure without diffusion or even an amorphous state, so that the new alloy produced cannot be obtained by traditional methods. Excellent performance.
The light beam can be guided by the light path, so it can handle the surface of the parts with special positions and complex shapes.
Combining the advantages of laser technology and the disadvantages of widely used technologies, applying green laser pointer technology to the surface strengthening treatment of tool materials will be one of the important ways to improve tool wear resistance and service life, especially for ceramics and cemented carbide The advantages of high hardness and good heat resistance of the tool help to improve the processing efficiency and processing accuracy.
And it can cut difficult-to-machine materials such as hardened steel under unfavorable processing conditions. Because of their relatively low strength and poor toughness, which severely limits their scope of application, the application of laser surface strengthening technology to ceramic and cemented carbide tools has profound research significance and broad application prospects.