Effect of Heat Treatment on Microstructure and Wear Resistance of (Ti,V)C Steel Bonded Carbide Produced by In-situ Sintering

(Ti,V)C steel bonded carbides were fabricated via powder metallurgy and in situ reactive synthesis technology.The microstructure and wear resistance of (Ti,V)C steel bonded carbide after quenching and tempering were studied by scanning electron microscopy and X-ray diffraction.The results show that the matrix microstructure of as sintered (Ti,V)C steel bonded carbide was fine pearlite structure.The quenched structure was made up of flake martensite,(Ti,V)C hard phase particles and undissolved carbides.(Ti,V)C steel bonded carbide had excellent tempering resistance.The secondary hardening could be obtained when it was tempered at 500 ℃.It had the better wear resistance when quenched at 1 000 ℃ and tempered at 250 ℃ or 500 ℃.