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为了改善高速钢的摩擦磨损性能,应用激光熔覆技术在高速钢试件表面制备出Al_2O_3熔覆网格。观察试件的金相组织,并测试显微硬度,分别对高速钢光滑试件和Al_2O_3熔覆网格试件进行了摩擦磨损试验。结果表明:Al_2O_3熔覆网格的硬度提高,Al_2O_3熔覆网格高速钢试件的磨损量降低;激光熔覆Al_2O_3网格以磨粒磨损为主,网格间隔区域高速钢基体的磨损机制包括磨粒磨损和黏着磨损;Al_2O_3熔覆网格硬度的提高、Al_2O_3硬质颗粒的弥散强化作用和Al_2O_3熔覆网格的抗黏着作用,有助于提高Al_2O_3熔覆网格高速钢试件的表面耐磨性。
In order to improve the friction and wear properties of high speed steel, Al 2 O 3 cladding grids were prepared on the surface of high speed steel by laser cladding. The microstructure of the specimens was observed and the microhardness was tested. The friction and wear tests of the high speed steel smooth specimens and the Al 2 O 3 fused mesh specimens were carried out respectively. The results show that the hardness of Al_2O_3 cladding grid increases and the wear amount of Al_2O_3 clad steel HSS decreases. The laser cladding Al_2O_3 grid mainly consists of abrasive wear. The wear mechanism of high speed steel base in grid spacing area includes Abrasive wear and adhesion wear. The increase of hardness of Al_2O_3 cladding grid, the dispersion strengthening of Al_2O_3 hard particles and the anti-adhesion of Al_2O_3 cladding grid can improve the surface of Al_2O_3 clad steel HSS Wear resistance.