Microstructure and properties of Ni-based alloy powder prepared with plasma cladding
XU Guo-jian
GAO Fei
HANG Zheng-xiang
ZHANG Guo-yu
QIU Xiao-jie
Abstract：In order to improve the performance of valve body in complete nuclear power equipment, the microstructure morphology and composition distribution of cladding layer were analyzed with the optical microscope(OM), scanning electronic microscope(SEM), X ray diffractometer(XRD), electronic probe microanalysis(EPMA) and energy dispersive spectrometer(EDS), the hardness of cladding layer was measured with the microhardness tester,and the wear resistance of cladding layer was analyzed with the wear tester. The results show that the cladding layer is mainly composed of hypereutectic microstructure, and the microstructure of cladding layer includes the plane crystal growth area, hypoeutectic microstructure area,eutectic microstructure area and hypereutectic microstructure area from the fusion line to the cladding surface. The metallic phases in the cladding layer are the γ-Ni, CrB, Cr2B, Cr7C3and Cr23C6phases, the primary phase consists of boride(CrB or Cr2B) and carbide(Cr7C3or Cr23C6), and the eutectic microstructure consists of Ni and Fe-rich austenitic solid solution or Ni-rich austenite solid solution. The average hardness of cladding layer surface is above 50 HV, which is about as 3 to 5 times as that of substrate. Compared with the base metal,the wear resistance of cladding layer increases by about 9 times.
Keywords：plasma claddinghypereutectic mirostructureeutectic microstructurehypoeutectic microstructureprimary phaseaustenite solid solutionhardnesswear resistance
Publication Date：2018-03-02
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 133-138 )