Research on Microstructure and Mechanical Performance of NbC and TiC on WC-12Co

IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
X. Q. Xia, M. S. Li, M. F. Gong
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Abstract

Three cemented carbide samples, WC-12Co, WC-12Co-0.5NbC and WC-12Co-0.5NbC-0.5TiC were prepared by vacuum liquid phase sintering. Combining SEM (scanning electron microscope), XRD (X-ray diffraction), and mechanical property testing, the effects of different combinations of grain growth inhibitors on the properties and microstructure of cemented carbide were analyzed and studied. The results show that there are significant differences in the microstructure and mechanical properties of cemented carbide samples with the addition of NbC and TiC. Both NbC and TiC can effectively suppress the abnormal growth of WC grains in the alloy, resulting in a uniformly distributed and fine grained hard alloy. Further comparative analysis shows that adding appropriate amount of NbC can effectively improve the fracture toughness of the sample; adding an appropriate amount of NbC and TiC simultaneously can further improve the surface hardness and wear resistance of the sample. Compared to the alloy sample without any inhibitor, the Vickers hardness value of the sample with NbC and TiC added simultaneously reached 1952.4HV30, increasing by about 10%, and the wear loss decreased by about 30%, compared to the alloy with single addition of NbC, the wear loss of the sample with both NbC and TiC decreased by about 27.5%. In general, when NbC and TiC are added simultaneously, the comprehensive properties of the sample alloy are more excellent.

Abstract Image

WC-12Co 上 NbC 和 TiC 的微观结构和机械性能研究
通过真空液相烧结制备了三种硬质合金样品:WC-12Co、WC-12Co-0.5NbC 和 WC-12Co-0.5NbC-0.5TiC。结合 SEM(扫描电子显微镜)、XRD(X 射线衍射)和力学性能测试,分析研究了不同晶粒生长抑制剂组合对硬质合金性能和微观结构的影响。结果表明,添加 NbC 和 TiC 后,硬质合金样品的微观结构和机械性能存在显著差异。NbC 和 TiC 都能有效抑制合金中 WC 晶粒的异常生长,从而获得均匀分布的细晶粒硬质合金。进一步的对比分析表明,添加适量的 NbC 可以有效提高试样的断裂韧性;同时添加适量的 NbC 和 TiC 可以进一步提高试样的表面硬度和耐磨性。与不添加任何抑制剂的合金试样相比,同时添加 NbC 和 TiC 的试样的维氏硬度值达到 1952.4HV30,提高了约 10%,磨损失效降低了约 30%;与单一添加 NbC 的合金相比,同时添加 NbC 和 TiC 的试样的磨损失效降低了约 27.5%。总的来说,同时添加 NbC 和 TiC 时,合金样品的综合性能更为优异。
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来源期刊
Strength of Materials
Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-
CiteScore
1.20
自引率
14.30%
发文量
89
审稿时长
6-12 weeks
期刊介绍: Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.
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