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为了进一步提高硬质合金的使用性能和探讨激光工艺对硬质合金的表面作用，叙述了高钴硬质合金激光表面相变硬化淬火工艺参数，如激光功率、扫描速度和光斑直径的选择，再通过处理后合金硬度、矫顽磁力、抗弯强度等物理力学性能分析，发现激光能量密度和合金抗弯强度有一定的关系，进而找到了合理的激光工艺。通过激光表面相变硬化淬火处理后，ＹＧ２０硬质合金的抗弯强度提高１０％以上，维氏显微硬度提高８０％，耐磨性提高１．６倍，使用寿命也有所提高。
In order to further improve the serviceability of the cemented carbide and to investigate the effect of the laser process on the cemented carbide surface, the process parameters of quenching, such as laser power, scanning speed and spot diameter, are described. Through the analysis of physical and mechanical properties of alloy after treatment, such as hardness, coercivity and flexural strength, it is found that there is a certain relationship between the laser energy density and the flexural strength of the alloy, and then a reasonable laser process is found. After quenching by laser surface transformation hardening, the flexural strength of YG20 cemented carbide increases more than 10%, the Vickers microhardness increases by 80%, the wear resistance increases by 1.6 times and the service life also improves.