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Effects of composite binder phase on microstructure and mechanical properties of ultrafine‐grained cemented carbides
Author(s) -
Yu Bin,
Wang Zhenhua,
Sun Ning,
Zheng Kan,
Wang Boxiang,
Yin Zengbin,
Yuan Juntang
Publication year - 2020
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13643
Subject(s) - materials science , flexural strength , microstructure , carbide , sintering , fracture toughness , phase (matter) , composite number , composite material , cemented carbide , grain size , metallurgy , bending , chemistry , organic chemistry
In order to develop a new high‐performance binder phase, four different alloys Co‐Ni‐Fe, Co‐Ni‐Cr, Co‐Ni‐Nb, and AlCoCrNiNb 0.5 were used as a binder in cemented carbides. The room‐temperature mechanical properties and high‐temperature flexural strength of cemented carbides were studied. The results show that the optimal mechanical properties for the WC‐8(Co‐Ni‐Fe, Co‐Ni‐Cr, Co‐Ni‐Nb, and AlCoCrNiNb 0.5 ) can be obtained at the sintering temperatures of 1200°C, 1350°C, 1350°C, and 1300°C, respectively. Compared with cemented carbides with Co as binder phase, the hardness of the four kinds of alloys is increased, the WC grain size becomes finer, but the fracture toughness is slightly decreased. When the temperature is under 600°C, there is no visible oxidation of the four kinds of cemented carbides, and their bending strengths are basically not reduced. When the temperature increased from 600°C to 900°C, the WC‐8(Co‐Ni‐Nb) and WC‐8(Co‐Ni‐Fe) samples present the better high‐temperature bending resistance compared with the WC‐8(Co‐Ni‐Cr) and WC‐8AlCoCrNiNb 0.5 samples, with respective decrease in bending strength of 11.7% and 7.3%.