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本文采用经典硬质合金生产工艺制备粘结相含量15%和20%(质量分数)的WC-Ni-Co-Cr硬质合金,研究了碳量变化对WC-Ni-Co-Cr硬质合金组织与性能的影响。结果表明:WC-Ni-Co-Cr硬质合金组织结构的变化受合金碳含量的控制,渗碳合金,WC相平均晶粒尺寸增大。添加Cr3C2会对Co+Ni复合粘结相硬质合金两相区宽度范围产生影响,使两相区碳含量上限降低。WC-Ni-Co-Cr硬质合金的钴磁随着碳含量的增加,先增大后略微降低,在碳饱和区内出现峰值,与粘结相含量相当的WC-Co合金相比,WC-Ni-Co-Cr合金的钴磁大幅降低。合金的矫顽磁力和硬度均随着碳含量的增加,先增大后减小,其变化规律存在良好的相似性,粘结相含量15%的合金,其硬度和矫顽磁力值较粘结相含量20%的合金高。随着碳含量的升高,合金抗弯强度增加,当合金中出现石墨相后,抗弯强度急剧下降。在本实验条件下,粘结相含量为15%时,BCtot为-0.02%合金的综合力学性能最优;粘结相含量为20%时,BCtot为-0.08%合金的综合力学性能最优。
In this paper, WC-Ni-Co-Cr cemented carbide with 15% binder phase and 20% (mass fraction) binder was prepared by classical cemented carbide process. The effect of carbon content on WC-Ni-Co-Cr cemented carbide The impact of organization and performance. The results show that the microstructure of WC-Ni-Co-Cr cemented carbide is controlled by the carbon content of the alloy, and the average grain size of the carburized alloy and WC phase increases. The addition of Cr3C2 affects the width of the two-phase region of the Co + Ni composite binder phase cemented carbide and reduces the upper limit of carbon content in the two-phase region. WC-Ni-Co-Cr cemented carbide magnetism with the increase of carbon content, first increased slightly decreased after the carbon saturation peak, compared with WC-Co alloy with the same content of binder phase, WC The cobalt magnetism of -Ni-Co-Cr alloy is greatly reduced. The coercive force and hardness of the alloy increase with the increase of carbon content, and then increase and then decrease, and the variation law of the alloy has good similarity. The alloy with 15% binder phase has better coercivity and coercivity value Phase content of 20% of the alloy high. With the increase of carbon content, the flexural strength of the alloy increases. When the graphite phase appears in the alloy, the flexural strength decreases sharply. Under the experimental conditions, the composite with BCtot content of -0.02% has the best mechanical properties when the content of binder phase is 15%. When the content of binder phase is 20%, the mechanical properties of BCtot is -0.08%.