The　work　aims　to　improve　the　tribological　properties　of　nickel-based　alloy　coatings.　Two　kinds　of　nickel-based　alloy　coatings　were　prepared　on　the　surface　of　GCr15　steel　by　induction　remelting　and　its　isothermal　quenching　respectively.　The　friction　and　wear　properties,　microstructures　and　surface　hardness　of　the　two　kinds　of　nickel-based　alloy　coatings　were　investigated　comparatively　by　pin-disc　friction　and　wear　tests,　scanning　electron　microscopy,　X-ray　diffractometer　and　microhardness　tests.　The　effects　of　isothermal　quenching　treatment　on　the　tribological　properties,　microstructure　and　surface　hardness　of　nickel-based　alloy　coatings　prepared　by　induction　remelting　were　investigated,　and　the　strengthening　mechanism　was　revealed.　The　friction　coefficient　and　wear　loss　of　the　remelting　coatings　after　isothermal　quenching　were　lower　than　that　of　the　induction　remelting　coatings.　The　friction　coefficient　during　the　friction　stabilization　stage　of　the　remelting　coatings　after　isothermal　quenching　was　0.301,　23.8%　lower　than　that　of　the　latter,　and　the　relative　wear　resistance　was　1.71　times　as　much　as　that　of　the　latter.　There　were　two　mechanisms　of　abrasive　wear　and　adhesive　wear　in　induction　remelting　coatings,　while　the　remelting　coatings　after　isothermal　quenching　were　dominated　by　abrasive　wear　and　had　better　resistance　to　abrasive　wear　and　adhesive　wear　than　the　former.　The　average　microhardness　of　the　induction　remelting　coating　and　the　coating　after　isothermal　quenching　was　818.0HV0.5　and　873.6HV0.5　respectively,　the　extreme　hardness　difference　was　170.9HV0.5　and　132.6HV0.5　respectively,　and　the　shape　parameters　were　18.5057　and　22.6189　respectively,　thus　the　latter　had　higher　average　hardness,　smaller　extreme　hardness　difference　and　more　stable　coating　properties　than　the　former.　Microstructure　analysis　showed　that　the　synergistic　effect　of　grain　refinement,　relative　homogeneity　and　dispersion　of　hard　phase,　reduction　of　eutectic　phase,　abundant　wear-resistant　ceramic　phase　and　directional　grain　structure　of　rapid　solidification　was　the　root　cause　of　the　excellent　Weibull　distribution　of　microhardness　and　the　further　improvement　of　the　wear　resistance.　Therefore,　the　appropriate　isothermal　quenching　heat　treatment　process　can　improve　the　microstructure　of　nickel-based　alloy　coating,　thus　effectively　reducing　the　friction　coefficient　of　the　coating　and　improving　its　wear　resistance.　©　2020,　Chongqing　Wujiu　Periodicals　Press.　All　rights　reserved.