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为提高W6Mo5Cr4V2高速钢的耐磨性,探究了进行深冷工艺时,在不同降温速率的影响下,磨损性能的变化规律。首先对W6Mo5Cr4V2高速钢进行传统的淬火处理,之后加入不同降温速率的深冷处理,最后进行回火处理。采用磨损率对其磨损性能进行了测定,探究耐磨性和硬度的关系,观察磨痕的微观形貌,并对微观组织进行SEM测试,从而分析耐磨性提高的原因。结果表明,未深冷处理试样以黏着磨损为主,深冷后的试样以氧化磨损为主;耐磨性随降温速率的增加先增加,在降温速率为2℃/min时耐磨性最好,相比于未深冷处理试样约提高1.5倍,之后随降温速率的进一步增加而降低。分析认为耐磨性提高是由于深冷处理极大地促进了残留奥氏体向马氏体的转变,促进了细小弥散碳化物的析出,从而提高了硬度,并增强了基体的抗磨损性能。
In order to improve the wear resistance of W6Mo5Cr4V2 high-speed steel, the variation regularity of wear properties under the influence of different cooling rates was investigated. First, W6Mo5Cr4V2 high-speed steel for the traditional quenching, followed by adding different cooling rate cryogenic treatment, and finally tempering. The wear rate was measured by wear rate. The relationship between wear resistance and hardness was explored. The microstructure of wear scar was observed. The microstructure was analyzed by SEM, and the reason of wear resistance was analyzed. The results show that the main wear resistance of the samples is not deep cryogenic treatment, the samples after cryogenic oxidation wear mainly; wear resistance increases with the cooling rate increases first, at a cooling rate of 2 ℃ / min, wear resistance Good, compared with non-cryogenic treatment of the sample increased by about 1.5 times, then with a further increase in the cooling rate decreases. The analysis shows that the improvement of wear resistance is due to the cryogenic treatment greatly promoted the transformation of retained austenite to martensite, promoted the precipitation of fine and dispersive carbides, increased the hardness and enhanced the wear resistance of the matrix.