Influence of the Rate of Gas Pressure Growth during Vacuum Compression Sintering on the Structure and Properties of the VK6M Hard Alloy

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Superhard Materials Pub Date : 2023-05-09 DOI:10.3103/S1063457623020090

M. M. Prokopiv, Yu. P. Ushchapovskyi, O. V. Kharchenko, H. M. Kramar, L. H. Bodrova, H. P. Kysla

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Abstract

Using the technology of vacuum compression sintering, which makes it possible to obtain hard alloys with a high level of mechanical and operational properties, the influence of gas pressure growth rates of 0.08, 0.2, and 0.5 MPa/min to 5 MPa during vacuum compression sintering on the structure and properties of the VK6M fine grained hard alloy is investigated. A positive effect of increasing the rate of gas pressure growth on the ultimate flexural strength and operational stability due to obtaining a structure with finer graines (d_WC = 1.24 μm), reducing the residual microporosity to A1 0.02, increasing the shape factor of carbide grains to 0.84, and decreasing the intensity of gas desorption by a factor of 2.5–7.0 is established. The ultimate flexural strength of the alloy sintered at a gas pressure growth rate of 0.5 MPa/min is 1.35 times higher compared to that of the alloy sintered at a gas pressure growth rate of 0.08 MPa/min and 1.5 times higher compared to that of the alloy sintered in a vacuum, while the relative operational stability against rough milling in the first case is higher by 1.35 and 1.8 times compared to those in the corresponding other two cases, respectively.

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真空压缩烧结过程中气体压力增长速率对VK6M硬质合金组织和性能的影响

利用真空压缩烧结技术，研究了真空压缩烧结过程中0.08、0.2、0.5 MPa/min ~ 5 MPa的气体压力增长速率对VK6M细晶硬质合金组织和性能的影响。真空压缩烧结技术使硬质合金具有较高的力学性能和使用性能。结果表明，提高气体压力增长速度对合金的极限抗折强度和工作稳定性有积极影响，可以获得更细的晶粒结构(dWC = 1.24 μm)，将残余微孔隙率降低到A1 0.02，将碳化物晶粒形状因子提高到0.84，将气体解吸强度降低2.5 ~ 7.0倍。气压增长速度为0.5 MPa/min的合金的极限抗弯强度是气压增长速度为0.08 MPa/min的合金的1.35倍，是真空烧结合金的1.5倍，相对于粗铣的相对运行稳定性分别是其他两种情况下的1.35倍和1.8倍。

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来源期刊

Journal of Superhard Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

1.80

自引率

66.70%

发文量

审稿时长

2 months

期刊介绍： Journal of Superhard Materials presents up-to-date results of basic and applied research on production, properties, and applications of superhard materials and related tools. It publishes the results of fundamental research on physicochemical processes of forming and growth of single-crystal, polycrystalline, and dispersed materials, diamond and diamond-like films; developments of methods for spontaneous and controlled synthesis of superhard materials and methods for static, explosive and epitaxial synthesis. The focus of the journal is large single crystals of synthetic diamonds; elite grinding powders and micron powders of synthetic diamonds and cubic boron nitride; polycrystalline and composite superhard materials based on diamond and cubic boron nitride; diamond and carbide tools for highly efficient metal-working, boring, stone-working, coal mining and geological exploration; articles of ceramic; polishing pastes for high-precision optics; precision lathes for diamond turning; technologies of precise machining of metals, glass, and ceramics. The journal covers all fundamental and technological aspects of synthesis, characterization, properties, devices and applications of these materials. The journal welcomes manuscripts from all countries in the English language.