Microstructures, properties and in situ preparation of novel VC and Al2O3 co-doped WC-Ni3Al-composites by reactive microwave sintering

Zhang, Jianjun; Wei, Xuelong; Yang, Xiao; Nie, Wuyang; Ai, Yongfeng; He, Wen

doi:10.1016/j.msea.2021.141273

Cited by 10 publications

(2 citation statements)

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“…The fracture toughness of composites is the ability of alloy to prevent crack expansion. 16 Toughening phenomena such as crack deflection, crack bridging, and crack branching can be seen by observing the crack extension graphics (Figure 8). A change in the direction of crack extension is called crack deflection.…”

Section: Mechanical Performances Of the Sintered Bulkmentioning

confidence: 99%

“…10,11 Nonetheless, the sintering of binderless tungsten carbide is challenging. The high sintering temperature needs to be combined with advanced sintering methods such as spark plasma sintering (SPS), 12,13 hot pressing sintering (HPS) 14,15 or microwave sintering (MS) 16 to achieve full densification. The SPS and MS methods have the advantage of higher heating rates and shorter dwelling time, which can effectively inhibit the growth of grains, thus improving the properties of the sintered alloy.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication and performances of WC‐Co cemented carbide with a low cobalt content

Yang

Wang

Zhang

et al. 2021

Int J Applied Ceramic Tech

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WC-Co cemented carbides with a low cobalt content (≤3 wt.%) were successfully manufactured by the powder metallurgy method. The cobalt content is lower than conventional cemented carbide (3-30 wt.%), which makes the prepared alloys possess excellent hardness. The effects of cobalt content on the densification behavior, phase composition, micromorphology, and mechanical performances of cemented carbides were investigated in detail. The results revealed that all the sintered alloys were almost completely consolidated with a relative density of greater than 98.0%. Moreover, abnormal grain growth was observed, and the inhomogeneity of WC grains decreased with the increment in cobalt content. In order to obtain cemented carbides with homogeneous microstructure and outstanding performances, VC was added to inhibit grain growth. Microstructure and performances were significantly affected by the addition of VC. The maximum Vickers hardness of cemented carbides without the addition of vanadium was 2234 HV30, while the fracture toughness was 7.96 MPa⋅m 1/2 after sintering WC-2 wt.%Co. After adding VC, the ultimate hardness and fracture toughness of WC-3 wt.%Co-0.5 wt.%VC alloy could reach 2200 HV30 and 8.61 MPa⋅m 1/2 , respectively. In addition, the obvious crack deflexion and transgranular behavior can be noticed, which can prevent the extension of crack and achieve an increase in fracture toughness of cemented carbides.

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Section: Mechanical Performances Of the Sintered Bulkmentioning

confidence: 99%