Mechanical properties and microstructure of spark plasma sintered WC-8 wt. %Co-VC-cBN ultrafine grained cemented carbide
Mechanical properties and microstructure of spark plasma sintered WC-8 wt. %Co-VC-cBN ultrafine grained cemented carbide
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机械%20性能%20和%20显微组织%20of%20spark%20等离子%20烧结%20WC-8%20wt.%20%Co-VC-cBN%20超细%20晶粒%20烧结%20硬质合金
DOI：
10.1016/j.ceramint.2019.08.078
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发表时间：
2019
影响因子：
5.2
通讯作者：
Wang Boxiang
中科院分区：
文献类型：
--
作者：
Wang Zhenhua;Liu Yaowen;Liu Kui;Wang Boxiang
WC-Co硬质合金刀具在切削难加工材料（如高温合金、钛合金和高强度钢）时可提供更好的切削性能。本文采用放电等离子烧结法制备了cBN和VC的高性能WC-8wt.%Co硬质合金材料。研究了cBN和VC含量对WC-8 wt.% Co-VC-cBN硬质合金材料力学性能和显微组织的影响。结果表明，随着cBN和VC含量的增加，WC基硬质合金材料的相对密度、维氏硬度和断裂韧性显着降低。 WC-8 wt.% Co-0.2wt%VC-1 wt.% cBN（命名为YG8V2B10）硬质合金材料在1250℃烧结时具有最佳性能。其维氏硬度为20.81GPa，断裂韧性为13.01MPam1/2，弯曲强度为1630MPa。还研究了 YG8V2B10 的高温弯曲强度。 YG8V2B10硬质合金材料的抗弯强度随着温度的升高而降低。当YG8V2B10硬质合金材料在空气中温度超过400℃时，YG8V2B10表面基体发生氧化，导致抗弯强度显着下降。
WC-Co cemented carbide tools offer better cutting performance when cutting difficult-to-machine materials, such as high-temperature alloys, titanium alloys, and high-strength steels. In this paper, high performance WC-8 wt.% Co cemented carbide materials with cBN and VC were prepared by spark plasma sintering. The effects of cBN and VC content on mechanical properties and microstructure of WC-8 wt.% Co-VC-cBN cemented carbide materials were studied. The results show that the relative density, Vickers hardness, and fracture toughness of WC-based cemented carbide materials decreased significantly as the content of cBN and VC increased. WC-8 wt.% Co-0.2 wt%VC-1 wt.% cBN (named as YG8V2B10) cemented carbide material had the optimal properties when sintered at 1250 °C. Its Vickers hardness, fracture toughness, and flexural strength are 20.81 GPa, 13.01 MPa m1/2, and 1630 MPa, respectively. High-temperature flexural strength of YG8V2B10 was also investigated. The flexural strength of YG8V2B10 cemented carbide materials decreased as the temperature increased. When the temperature of YG8V2B10 cemented carbide material exceeded 400 °C in air, matrix at the surface of YG8V2B10 was oxidized, which leads to a significant decrease in the flexural strength.