Improvement of the Microstructure and Properties of Iron-based Material Directly Synthesized from Vanadium-bearing Titanomagnetite Concentrate by Heat Treatment
CHEN Sitan, FENG Keqin*, ZHANG Yanyan, CAI Yuchen
School of Mechanical Engineering, Sichuan University, Chengdu 610065,China
Abstract: An iron-based friction material was directly prepared from vanadium-bearing titanomagnetite concentrate by selective carbothermal in-situ reaction and vacuum sintering technology. This study focuses on the effects of quenching and tempering on the material. The results show that the material's microstructure and properties are improved by appropriate quenching and tempering. The microstructure of the material changes from pearlite to martensite by quenching at 900—1 000 ℃. With the increase of quenching temperature, the hardness and tribological properties are enhanced and reach the best by quenching at 950 ℃. Meanwhile, the tribological behavior is ameliorated from severe abrasive and adhesive wear to abrasive wear. Then, 950 ℃ quenched materials were tempered at 250 ℃, 500 ℃ and 650 ℃ respectively. The microstructure changes from martensite to lower-hardness troostite by tempering at 500 ℃, and lowest-hardness sorbate is generated by tempering at 650 ℃. Particularly, secondary hardening in tempering and dissolution of carbides occur by tempering at 500 ℃〗. Therefore, the hardness and tribological properties only get improved when tempering temperature is 500 ℃, and the tribological behavior changes to mild abrasive wear. Consequently, by quenching at 950 ℃ and then tempering at 500 ℃, the microstructure and properties of iron-based friction materials reach the maximum value. The hardness increases by 32%, wear rate decreases by 61% and the friction coefficient decreases by 18%.
陈思潭, 冯可芹, 张燕燕, 蔡雨晨. 利用热处理改善钒钛磁铁矿直接制备的铁基摩擦材料组织与性能[J]. 材料导报, 2021, 35(14): 14120-14124.
CHEN Sitan, FENG Keqin, ZHANG Yanyan, CAI Yuchen. Improvement of the Microstructure and Properties of Iron-based Material Directly Synthesized from Vanadium-bearing Titanomagnetite Concentrate by Heat Treatment. Materials Reports, 2021, 35(14): 14120-14124.
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2021, Vol. 35 
