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本文以WC-50%Fe合金为研究对象,采用元素粉末添加方式,研究了Al含量为0%、3.5%、5%、6.5%(文中含量均为质量分数)对WC-Fe合金的组织和性能的影响规律;并对烧结过程中550℃保温处理对合金组织的影响进行了探讨。结果表明:随Al含量的增加,WC平均晶粒尺寸从3.0μm减小到2.4μm,基体相分布更加均匀;出现的Al_2O_3和Fe_3W_3C的含量与合金制备过程中碳含量有关,随Al含量的增加,合金中碳含量增加,Al_2O_3含量增加,Fe_3W_3C含量降低;在550℃进行保温处理后,可以有效避免合金出现变形和膨胀;随Al含量的增加,合金抗弯强度略有提高,从2 100 MPa提高至2 300MPa;而合金的硬度大幅度增加,从51 HRC增加至61 HRC。
In this paper, the WC-50% Fe alloy was studied, and the addition of elemental powder was used to study the microstructure and mechanical properties of WC-Fe alloy with 0%, 3.5%, 5% and 6.5% Al content The effect of 550 ℃ heat treatment on the microstructure of the alloy during sintering was discussed. The results show that with the increase of Al content, the average grain size of WC decreases from 3.0μm to 2.4μm, and the matrix phase distribution is more uniform. The contents of Al_2O_3 and Fe_3W_3C are related to the carbon content during the preparation of the alloy. With the increase of Al content , The content of carbon in the alloy increases, the content of Al 2 O 3 increases and the content of Fe 3 W 3 C decreases. The deformation and expansion of the alloy can be effectively avoided after the heat treatment at 550 ℃. The flexural strength of the alloy increases slightly with the increase of Al content, Increased to 2 300MPa; and the hardness of the alloy increased significantly from 51 HRC to 61 HRC.