(1.天津市硬质合金研究所， 天津 300222 ;2.天津大学材料科学与工程系 ,天津 300072;3.天津理工学院物理系， 天津 300191)
摘 要: 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。
关键字: 硬质合金 激光 淬火
（1.Tianjin Research Institute of Cemented Carbide, Tianjin 300222, P. R. China;
2.Department of Materials Science and Engineering,Tianjin University, Tianjin 300072, P. R. China;
3.Department of Physics, Tianjin College of Science and Technology, T ianjin 300191, P. R.China）
Abstract:The relationship between the energy density of the laser beam used for surface phase transition hardening quenching and bending strength of the cobalt cemented carbide treated by laser was found by analysing physical and mechanical properties of the cemented carbide treated, and the reasonable laser treatment procedure was found too. After laser quenching, the bending strength, Vickers microhardness and wear-tear resistance of YG20 cemented carbide increase 10%, 80% and 160%, respectively.
Key words: cemented carbide laser quenching
