Electron beam cladding surface modification process and high temperature wear resistance of Ni-based alloy

doi:10.13251/j.issn.0254-6051.2021.04.029

Abstract

Abstract: WC-CoCr composite coating was cladded on the surface of Inconel 617 superalloy by electron beam. Orthogonal experiment was designed to analyze the influence of process parameters on the clad layer, and the microstructure and properties of the optimized coating were studied. The results show that the beam current is the most significant influence on the quality characteristics of the coating. The clad layer obtained a good metallurgical bond, which undergoes ion exchange under the optimized process. The modified surface exists the WC, CoCr, (Fe, Ni) C₆, Fe₃W₃C phases and the α-Co solid solution, and the decomposition of WC is effectively inhibited by electron beam treatment, the microhardness reaches 1200 HV0.3. The microstructure of the coating is mainly the distribution of dendrites and a variety of eutectic on the CoCr matrix, which high temperature sliding wear behavior has lower wear rate and friction coefficient than Inconel 617 matrix at 200 ℃, 600 ℃ and 1000 ℃, wear resistance has been enhanced.

Key words: Inconel 617 alloy, electron beam cladding, high temperature wear resistance, process optimization

CLC Number:

TG44
TG456.3

Liu Hailang, Lu Ruxue, Chen Jian, Xu Guangtao, Zhang Qian. Electron beam cladding surface modification process and high temperature wear resistance of Ni-based alloy[J]. Heat Treatment of Metals, 2021, 46(4): 161-166.

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