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采用Nd∶YAG激光器在H13钢表面制备Co基合金涂层,分析扫描速度和电流强度对涂层成形质量的影响,确定最优参数。借助扫描电镜和X射线衍射仪分析了涂层组织形貌及物相组成。使用显微硬度计和摩擦磨损试验机测试了涂层截面硬度及耐磨性能。结果表明:激光熔覆扫描速度增加和电流强度降低,均可使Co基合金涂层熔高和熔宽降低,孔洞和裂纹数量减少。优化工艺参数为:扫描速度120 mm/min,电流200 A。该工艺制备涂层组织主要由细小的枝晶和共晶组成,包括γ-Co和M_(23)C_6相,涂层硬度达到610 HV0.2;耐磨性是淬火回火态H13钢的1.32倍。
The Co-based alloy coating was prepared on the surface of H13 steel by using Nd:YAG laser, and the influence of scanning speed and current intensity on the quality of the coating was analyzed to determine the optimal parameters. The microstructure and phase composition of the coating were analyzed by scanning electron microscopy and X-ray diffraction. The hardness and wear resistance of the coating were tested using a microhardness tester and a friction and wear tester. The results show that the increase of laser cladding scanning speed and the decrease of current intensity can decrease the melting height and melting width of Co-based alloy coatings and reduce the number of holes and cracks. Optimization of process parameters: scanning speed of 120 mm / min, current 200 A. The microstructure of the coating was composed of fine dendrites and eutectics, including γ-Co and M_ (23) C_6 phases and the coating hardness reached 610 HV0.2. The wear resistance was 1.32 for quenched and tempered H13 steel Times