Wear resistance of surface metal matrix composite produced by gas tungsten arc melt injection of Cr<inf>3</inf>C<inf>2</inf>-NiCr particles into low carbon steel

Abstract

Cr3C2-NiCr particles were injected into the melted surface of Q235 low carbon steel to make a surface metal matrix composite (MMC) layer by gas tungsten arc melt injection (GTAMI) process. Hardness of the surface MMC layer was tested. Wear resistance of the surface MMC was investigated with a ball-on-disk dry sliding setup. Microstructures of the surface MMC layer and morphology of the worn surfaces were investigated with scanning electron microscopy (SEM). The results showed that the hardness of the MMC was as high as 1960.7 HV. Wear loss of the upper part of the MMC layer is only 0.8% of that of the substrate under the dry sliding condition given. Wear loss of the bottom part is 2.5% of that of the substrate. © 20120Editorial Board of CHINA WELDING.