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利用5kW连续波CO2激光器对16Mn钢基材表面预置的含20 vol%B4CP的Ni基合金复合粉末进行激光熔覆得到Ni基B4C合金涂层(NiB4c),研究了NiB4c涂层的组织形貌与相组成,并用单纯的镍基合金涂层(Ni60)进行了显微硬度及滑动磨损性能的对比试验。结果表明,NiB4C涂层由涂层下部的胞状晶和涂层中上部的树状枝晶及其间的共晶组织所组成,其组成相为γ-Ni,γ-(Ni,Fe)固溶体和(Cr,Fe)7C3,CrB,Ni3B,Fe2B,Fe23(C,B)6等化合物,涂层中存在未熔的B4C颗粒。激光熔覆NiB4c涂层比Ni60涂层具有较高的硬度和耐磨性,并分析了NiB4C涂层的强化机理。
The NiB4c alloy coating (NiB4c) was obtained by laser cladding a 20 vol% B4CP Ni-based alloy composite powder pretreated on the surface of 16Mn steel substrate with a 5kW CW CO2 laser. The microstructure of NiB4c coating And the phase composition, and with a simple nickel-based alloy coating (Ni60) for microhardness and sliding wear performance comparison test. The results show that the NiB4C coating consists of the cell-like crystals in the lower part of the coating and the dendritic dendrites in the upper part and the eutectic structure in the coating. The NiB4C coating has a composition of γ-Ni, γ- (Ni, Fe) Cr, Fe) 7C3, CrB, Ni3B, Fe2B, Fe23 (C, B) 6 and other compounds, the coating contains unmelted B4C particles. Laser cladding NiB4c coating has higher hardness and wear resistance than Ni60 coating, and the strengthening mechanism of NiB4C coating is analyzed.