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本文通过对回火试样的硬度、电阻率的测定和碳化物聚集、长大过程的光学和电子显微镜观察研究铝对高速钢回火转变过程的影响。获得的初步试验结果是:由于固溶强化,铝的加入使高碳W_6Mo_5Cr_4V_2钢的淬火硬度有所提高。因为铝不增加在加热时奥氏体中的固溶碳含量,因此它对回火时的二次硬化的峰值硬度及其所出现的回火温度没有明显地影响。然而铝对高碳W_6Mo_5Cr_4V_2钢在回火时碳化物的聚集和长大有抑制作用,因而提高淬火钢的抗回火能力,改善了性能。
In this paper, the effects of aluminum on the tempering process of high-speed steel were investigated by optical and electron microscopy observations of the hardness and resistivity of the samples and the aggregation and growth of carbides. The preliminary test results obtained are: The quenching hardness of high-carbon W_6Mo_5Cr_4V_2 steel increased due to the addition of aluminum due to solid solution strengthening. Because aluminum does not increase the amount of dissolved carbon in the austenite during heating, it does not have a significant effect on the peak hardness of the secondary hardening during tempering and the tempering temperature at which it appears. However, the high carbon content of W6Mo_5Cr_4V_2 steel in the tempering of the carbide aggregation and growth inhibition, thereby enhancing the anti-tempering quenched steel ability to improve performance.