Electric-spark deposition (ESD),which is a micro-welding process,was adopted for depositing a TiN reinforced Fe-based metal matrix composite coating with the thickness of 60～80 μm on 45# steel substrate using a laboratory-developed special gas-filled-closed electric-spark deposition device and elctric-spark deposition machine modeled DZ-1400,where the industry pure titanium (TA2) is used for electrode and the industry pure nitrogen gas as shielding and reacting atmosphere.The microstructures,interfacial behavior and phase of the coatings were investigated by scanning electronic microscope and X-ray diffractometer.The microhardness profile of coatings was tested and its wear-resisting property was compared with that of W18Cr4V rapid steel quenched by the home-made abrasion machine as well.The results show that an excellent bonding between the coatings and carbon steel substrate is ensured by the strong metallurgical interface and phase of the coatings are mainly composed of TiN and FeTi.The highest microhardness HV of coating reaches 15.88 GPa,which is about five times more than that of the substrates.The anti-abrasive test results show the coating has better anti-abrasive performance than W18Cr4V rapid steel treated by quenching.
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