采用Nd…YAG激光对预置有溶胶凝胶法制备的TiO2/C混合粉末的45#钢表面进行激光强化实验,制备TiC增强强化涂层。研究了激光工艺参数以及TiO2/C的成分配比对强化层生成物相的影响,探寻生成TiC的最佳工艺组合和粉末材料的成分配比。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)测试方法对激光强化样品进行物相、显微组织以及元素分析。结果表明,能生成TiC的最佳工艺组合为激光电流250A,脉冲频率18Hz,脉冲宽度2.5ms,扫描速度为50mm/min,TiO2与C的物质的量比为1…5。在上述工艺条件下,可在45#钢表面原位合成TiC增强相,并获得TiC颗粒均匀分布的强化涂层。 The surface of 45 # steel with TiO2 / C mixed powder prepared by sol-gel method was laser strengthened by Nd ... YAG laser to prepare TiC reinforced reinforced coating. The effects of laser process parameters and the composition ratio of TiO2 / C on the phase of the reinforced layer were investigated, and the optimum technological composition of TiC and the composition of the powder materials were explored. The phase, microstructure and elemental analysis of the laser-strengthened samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) The results show that the optimum process combination of TiC is laser current of 250A, pulse frequency of 18Hz, pulse width of 2.5ms, scanning speed of 50mm / min, and TiO2 / C ratio of 1: 5. Under the above process conditions, the TiC reinforcing phase can be synthesized in situ on the surface of 45 # steel and the strengthened coating with even distribution of TiC particles can be obtained.