Research on Microstructure and Properties of TaC/FeCoCrNiTiMo Cladding Layer Prepared by Laser Cladding
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摘要: 采用激光熔覆技术在45#钢表面制备添加碳化钽(TaC)纳米颗粒的FeCoCrNiTiMo高熵合金熔覆层，利用X线衍射（XRD）、扫描电镜（SEM）、能谱仪（EDS）及显微硬度计分析测试熔覆层相结构、组织形貌及截面硬度. 研究表明，在FeCoCrNiTiMo高熵合金熔覆层中添加TaC纳米颗粒后，其相结构以体心立方结构的FeCrNi固溶体和面心立方结构的NiCrCoMo固溶体为主，并含有极少量的金属间化合物，熔覆层维氏硬度（HV）达到1058.89 ，是基材硬度的两倍.Abstract: The cladding layer of FeCoCrNiTiMo high entropy alloy with TaC nanoparticle was prepared on the surface of 45# steel by laser cladding. The phase composition, microstructure and the cross-section hardness of the cladding layer were analyzed and tested by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and microhardness tester. Studies show that by adding TaC nanoparticles to FeCoCrNiTiMo high entropy alloy cladding layer, the phase structure of the alloy is mainly composed of body-centered cubic FeCrNi solid solution and face-centered cubic NiCrCoMo solid solution, and contains a very small amount of intermetallic compounds. The Vickers hardness (HV) of cladding layer reaches 1058.89, which is twice the hardness of the base material.
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图 1 TaC/FeCoCrNiTiMo复合熔覆层XRD谱图
Figure 1. XRD pattern of TaC / FeCoCrNiTiMo composite cladding layer
表 1 45#钢化学成分含量
Table 1. Chemical composition of 45# steel
% C Si Mn P S Fe 0.45 0.18 0.37 ≤0.02 ≤0.02 其余 
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