TaC含量对WC-9Co粗晶硬质合金显微组织和力学性能的影响（英文）

发布时间：2018-06-24 18:36

本文选题：粗晶WC-Co硬质合金 + TaC　；参考：《Transactions of Nonferrous Metals Society of China》2015年04期

【摘要】：采用热等静压烧结和气淬工艺制备6种不同TaC含量的WC-9Co粗晶硬质合金。利用扫描电镜,能谱仪、X射线衍射等方法研究TaC含量对WC-9Co粗晶硬质合金显微组织、Co中Ta和W含量的影响,并对合金的力学性能进行测试和比较。结果表明:当TaC添加量为0.4%时,WC晶粒生长被明显抑制,WC-9Co的硬度和强度达到最大值,分别为HV 1124和2466 MPa。当TaC添加量超过0.6%时,WC晶粒不再进一步减小,合金显微组织中出现(W,Ta)C相;而且随着TaC含量的增加,合金的强度和韧性提高,同时Co中的(Ta+W)含量下降。这表明,对于具有正常WC+γ组织的粗晶WC-TaC-9Co合金,降低Co中的(Ta+W)含量有利于提高其力学性能。
[Abstract]:Six kinds of WC-9Co coarse crystal cemented carbides with different TaC contents were prepared by hot isostatic pressure sintering and gas quenching. The effects of TaC content on Ta and W contents in the microstructure of WC-9Co coarse cemented carbides were studied by means of scanning electron microscopy (SEM) and X-ray diffraction (EDS). The mechanical properties of the alloys were tested and compared. The results showed that the hardness and strength of WC-9Co were significantly inhibited when the content of TaC was 0.4 and the hardness and strength of WC-9Co reached the maximum values of HV 1124 and 2466 MPA, respectively. When the content of TaC is more than 0.6%, the WC grain will not decrease further, and the (WU Ta) C phase will appear in the microstructure of the alloy, and with the increase of TaC content, the strength and toughness of the alloy will increase, while the content of (Ta W) in Co will decrease. It is shown that for the coarse WC-TaC-9Co alloy with normal WC 纬 structure, decreasing the content of (Ta W) in Co can improve the mechanical properties of WC-TaC-9Co alloy.
【作者单位】：中南大学粉末冶金研究院;
【基金】：Project(2013zzts025)supported by the Fundamental Research Funds for the Central Universities of China
【分类号】：TG135.5

【参考文献】