Abstract
The in-situ M7C3–TiC carbides reinforced Fe-based hardfacing coating had been produced by prepared high-carbon ferrochromium, ferrotitanium and graphite power on 20g steel through GTAW. The microstructure and hard phases morphology were investigated by means of OP, SEM and XRD. The results showed that the microstructure of hardfacing coating consists of lamellar martensite, TiC particles and M7C3complex carbides. The TiC particles with flower-like shape and M7C3complex carbides with hexagonal shape are observed in the coating. The hardfacing coating reinforced by M7C3–TiC carbides revealed higher wear resistance than that of the substrate due to the presence of a high volume fraction of hard and wear-resistance primary M7C3carbide uniformly distributed in the fine and strong [M+M7C3+TiC] eutectics matrix.
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