利用粉末冶金技术,原位烧结合成了(Ti,V)C钢结硬质合金,并用扫描电镜、X射线衍射仪等研究了热处理对原位烧结(Ti,V)C钢结硬质合金组织和耐磨性的影响.结果表明:烧结态(Ti,V)C钢结硬质合金基体组织为细珠光体组织;100O℃淬火后的组织转变为片状马氏体+(Ti,V)C硬质相颗粒+少量未溶碳化物;回火过程中合金具有较高的抗回火稳定性,在500℃左右回火时存在二次硬化现象;该合金在1000℃淬火、经250,500℃回火后具有较好的耐磨性.
(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 ℃.
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