激光表面合金化是一种局部表面变质处理的新方法。它是在钢件需要合金化的部位涂敷或注入一薄层合金元素,然后用激光作热源,使合金和钢件表面快速熔化,通过冶金结合,生成双层复合材料,可使普通材料表面获得特殊的性能(如耐磨、耐蚀、耐热等)。因此,激光合金化具有显著的经济效益,引起了人们极大的兴趣。本文用扫描电镜、电子探针、X射线衍射仪、电子能谱仪、显微硬度计和电阻应变仪等技术,研究了20号钢表面经等离子喷涂Co基、Ni基和Fe基等合金粉末,并经连续CO_2激光束和脉冲钕玻璃激光束照射后, Laser surface alloying is a new method of local surface modification. It is the need to alloy steel parts coated or injected a thin layer of alloying elements, and then use the laser as a heat source, the alloy and the rapid melting of the steel surface, through metallurgical bonding, generating double composite material, the general material surface Get special properties (such as wear, corrosion, heat, etc.). Therefore, laser alloying has significant economic benefits, has aroused great interest. In this paper, the surface of 20 # steel was plasma sprayed with Co-based, Ni-based and Fe-based alloy powder by scanning electron microscopy, electron probe, X-ray diffraction, electron spectroscopy, microhardness tester and resistance strain gauges , And after continuous CO_2 laser beam and pulsed neodymium glass laser beam irradiation,