激光熔覆Ni基SiC合金涂层组织与性能的研究

Microstructure performance of laser clad Ni-based alloy coating with SiC ceramics particles

摘要: 利用5kWCO2连续波激光器在16Mn钢基材表面对含20%(体积比)SiC陶瓷粉末的镍基自熔性合金粉末进行激光熔覆得到Ni基SiC合金涂层(NiSiC)。研究了合金涂层的组织形貌及相结构,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,NiSiC合金涂层由γ枝晶及其间的共晶组织组成,主要组成相为γ-Ni,γ-(Ni,Fe)固溶体和(Cr,Fe)7C3,Cr23C6及(Cr,Si)3Ni3Si等化合物。添加SiC的镍基合金涂层NiSiC比单纯的镍基合金涂层Ni60具有较高的硬度和耐磨性。

Abstract: Laser clad Ni based alloy coating with 20%(vol%)SiC(NiSiC) on 16Mn steel substrate has been obtained by 5kW CO2 continuous wave laser implement. Microstructure morphology and phase structure of the laser clad alloy coating have been studied,and microhardness and the performance of sliding wear test of the coating have been discussed in contrast to laser clad Ni-based alloy coating(Ni60). The result shows that the microstructure of laser clad alloy coating is consisted of γ dendrite solid solution and the eutectic structure between the dendrites. Constituent phases of the coating mainly have γ-Ni,γ-(Fe,Ni),(Cr,Fe)7C33,Cr23C6 and (Cr,Si)3Ni3Si. Microhardness and sliding wear resistance of the NiSiC coating are higher than that of the Ni60 coating.