Abstract
• The cross-sectional of the sample is composed of three parts: alloy layer, heat-affected zone and matrix. • The effect of beam current on the properties of alloy layer was studied. • A surface alloying method combining scanning electron beam and plasma thermal spraying is proposed. Scanning electron beam surface alloying can effectively improve the surface quality. In this paper, plasma thermal spraying technology and scanning electron beam technology are used to treat the surface of 20Cr steel. The effect of beam current on the microstructure, microhardness and wear resistance of alloy layer was studied. The results show that after alloying treatment, the cross-sectional structure of the sample is composed of three parts, the alloy layer, the heat-affected zone and the matrix. The microstructure of the alloy layer is acicular martensite, Fe-Ni solid solution, WC particles and a small amount of retained austenite. The microstructure of the heat-affected zone is mainly acicular martensite and lath martensite, the matrix structure is ferrite and pearlite. When the beam current reaches 12 mA, the surface hardness of the sample reaches the maximum (867HV), and the wear loss reaches the minimum (4.3 mg).
Published Version
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