Microstructure and wear resistance of laser clad Cr7C3 reinforced Cr-Ni-Si coating
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Engineering Research Center of Ministry of Education on Laser Direct Manufacturing of Large Metal Components, Beihang University, Beijing 100191, China
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Corresponding author:
DIAO Wang-xun, wanphm@buaa.edu.en
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Received Date:
2010-09-13
Accepted Date:
2010-09-29
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Abstract
A wear resistant Cr7C3 reinforced Cr-Ni-Si ternary metal silicide composite coating was fabricated on a substrate of A3 mild steel by means of laser cladding with Cr3C2 and 0.47Cr-0.50Ni-0.03Si alloy powder as the precursor material.The microstructure and composition of the coating were investigated by means of optical microscopy,scanning electron microscopy,Xray diffraction,energy dispersive spectrometer and electron probe micro-analyzer.Then the wear resistance of the coating was tested under dry sliding wear condition at room temperature.Results indicated that,microhardness of the Cr-Ni-Si coating was evidently improved because of the introduction of Cr7C3.The laser clad Cr7C3 reinforced Cr-Ni-Si ternary metal silicide composite coating shows excellent wear resistance under dry sliding wear test conditions.
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