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以自主成分设计的高钒高速钢(HVHSS)为研究对象,在1100~1220℃温度区间进行淬火热处理,研究淬火温度(T_q)对钢摩擦磨损性能的影响。结果表明:当T_q=1100℃时,碳化物偏聚得不到改善,基体韧性差,摩擦磨损过程中裂纹一旦萌生即迅速扩展,造成碳化物整体磨损剥落,耐磨性差;T_q超过1140℃时,大量碳化物分解,合金元素熔入马氏体中,导致Mf降低,残留奥氏体增加,基体硬度低,碳化物硬质点得不到保护,过早暴露,导致其耐磨性差。经1140℃淬火-回火处理试样组织中针状马氏体含量较多,且保留适量韧性较好的残留奥氏体相,细小粒状碳化物分布均匀,摩擦因数最小,平均摩擦因数仅为0.3254,与Si C砂轮对磨10 h后,其磨损量仅为9.9 mg,约为1100℃淬火-回火试样的48%,耐磨性最好。
High-vanadium high-speed steel (HVHSS) designed by independent component was taken as the research object. The quenching heat treatment was carried out at 1100-1220 ℃ to study the influence of quenching temperature (T_q) on the friction and wear properties of steel. The results show that when T_q = 1100 ℃, the segregation of carbides does not improve, the toughness of the matrix is poor and the cracks rapidly expand once the cracks occur in the process of friction and wear, resulting in the overall wear and tear of carbides being poor and the wear resistance is poor. When Tq exceeds 1140 ℃ , A large number of carbide decomposition, alloying elements melted into the martensite, resulting in reduced Mf, retained austenite increases, the matrix hardness is low, carbide hard points can not be protected, premature exposure, resulting in poor wear resistance. After 1140 ℃ quenching-tempering treatment, the microstructure of the sample is characterized by a large amount of acicular martensite and a retained austenite phase with good toughness. The fine and granular carbides distribute evenly and the friction coefficient is the smallest. The average friction coefficient is only 0.3254. After abrasion with Si C grinding wheel for 10 h, the wear amount is only 9.9 mg, which is about 48% of that of the quenched and tempered sample at 1100 ℃. The wear resistance is the best.