Effect of ultrafine WC contents on the microstructures, mechanical properties and wear resistances of regenerated coarse grained WC-10Co cemented carbides

Lu, Zhenyun; Du, Jinhui; Sun, Yujing; Su, Guosheng; Zhang, Chongyan; Kong, Xiangdong

doi:10.1016/j.ijrmhm.2021.105516

Cited by 39 publications

(18 citation statements)

References 36 publications

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“…At the beginning of wear, the Ni binding phase was removed first, and then the brittle Mo 2 NiB 2 hard phase without sufficient support gradually cracked and peeled off. The Mo 2 NiB 2 fragments that fall off can be used as abrasive particles to further deteriorate the wear resistance of the samples 32 . With increasing SiCw content, as seen in Figure 13C, the wear degree of MW‐0.5 is shallower than that of MW‐0 and the wear surface is narrower.…”

Section: Resultsmentioning

confidence: 99%

“…The Mo 2 NiB 2 fragments that fall off can be used as abrasive particles to further deteriorate the wear resistance of the samples. 32 With increasing SiCw content, as seen in Figure 13C, the wear degree of MW-0.5 is shallower than that of MW-0 and the wear surface is narrower. Figure 13D shows that the worn surface is relatively complete, and only part of the Mo 2 NiB 2 peels off, which indicates mild abrasive wear.…”

Section: Friction and Wearmentioning

confidence: 88%

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Preparation and toughening mechanism of Mo₂NiB₂‐based cermets with SiC whiskers

Zhang

et al. 2021

Int J Applied Ceramic Tech

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Mo2NiB2 is a kind of cermet with excellent mechanical properties, stable chemical properties, and excellent corrosion resistance and is often used in wear‐resistant application fields, such as injection molding machine parts, can making tools and hot copper extruding dies. The brittleness of Mo2NiB2‐based cermets limits their wide application. Mo2NiB2‐based cermets were prepared by the vacuum sintering method, the effect of SiC whiskers (SiCw) on the microstructure and mechanical properties of cermets was investigated, and the toughening mechanism of SiCw on cermets was further discussed. The results indicate that with increasing SiCw content, the indentation fracture toughness (KIC), transverse fracture strength (TRS), and Vickers hardness (HV) of the cermets first increase and then decrease. The HV, TRS, and indentation fracture toughness of Mo2NiB2‐based cermets with 0.5 wt% SiCw are 1 113 HV, 1 620 MPa, and 27.97 MPa·m1/2, respectively, which are 16.8%, 22.7%, and 25% higher than those without SiCw. In the sliding friction tests, Mo2NiB2‐based cermets with 0.5 wt% SiCw have the smallest friction coefficient, low wear rate, and high wear resistance. SEM observation and analysis of the crack path and fracture surface showed that the toughening mechanism is whisker bridging, crack deflection, microcrack toughening, and whisker pull‐out. The results indicate that the addition of 0.5 wt% SiCw can effectively improve the mechanical properties of Mo2NiB2‐based cermets and further expand the application space of Mo2NiB2‐based cermets.

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Section: Resultsmentioning

confidence: 99%

Section: Friction and Wearmentioning

confidence: 88%

Preparation and toughening mechanism of Mo₂NiB₂‐based cermets with SiC whiskers

Zhang

et al. 2021

Int J Applied Ceramic Tech

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“…2–4 The excellent physical properties of ultrafine cemented carbide contribute to its wide application in industry, but also make its processing more difficult. 5 In order to ensure the performance and service life of ultrafine cemented carbide in precision machining, the surface finish of ultrafine cemented carbide must be improved by grinding. 6–9…”

Section: Introductionmentioning

confidence: 99%

Effect of the grinding process on the surface quality of ultrafine cemented carbide with different Co content

Zhao

Zheng

et al. 2022

Advances in Mechanical Engineering

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By using a resin bonded diamond grinding wheel, the influence of grinding conditions on processing quality of the ultrafine cemented carbides with different Co content were investigated. Through grinding experiments, the effects of grinding wheel linear speed, feed speed and grinding depth on the surface morphology, roughness, and residual stress of cemented carbides were studied, and the relationship between grinding conditions and machining quality was established. Then, the evaluation and prediction of surface quality according to the grinding parameters can be realized by using ternary regression analysis. Finally, gray relational analysis was applied to optimize the multi-objective concerning surface quality to find the optimal grinding process parameters. The grinding test results show that with the increase of grinding linear speed as well as the decrease of feed speed and grinding depth, the maximum undeformed abrasive particle thickness decreases, which improves the surface plastic removal ratio and reduces the surface roughness. The multi-objective optimization of the grinding process can be achieved by using gray relational analysis, the resulting optimal process parameters achieve the lowest residual stress and surface roughness, which provides a theoretical basis for the prediction and control of the surface quality of cemented carbide in the grinding process.

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“…The most common approach is based on finding the relationship between the grain size of the carbide phase and the characteristics of the alloys. This takes into account both the influence of the initial particle size distribution of the mixture [7] and the influence of sintering condi tions on the change in particle size distribution [8,9].…”

Section: Introductionmentioning

confidence: 99%

Development of quality control and structure parameters determination methods for large size products from sintered hard alloys WC-(Co+Ni+Cr) based on analysis of the ultrasonic oscillations spreading parameters

Pashynskyi¹,

Boyko²

2021

TAPR

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The object of research is hard alloys with a morphology of the carbide phase skeleton structure, in which particles contact with each other, and the gaps between them are filled with a binder phase. The mechanical and service characteristics of such materials depend on the degree of development of the skeleton structure. One of the most problematic areas is the lack of non-destructive methods for determining the parameters of the structure. The introduction of such techniques will allow obtaining objective information on the structure of the material and using it to evaluate the quality of products. In the course of the study, the parameters of the scattering of elastic vibrations in inhomogeneous media were determined. The main hypothesis of the study is the assumption that the processes of energy dissipation occur both in the structural elements themselves (carbide grains and bond areas) and at their boundaries. Therefore, the evaluation of dissipation processes will allow obtaining a quantitative estimation of the alloys structure parameters, and will allow assessing the quality of the material. The following characteristics were chosen as the parameters characterizing the propagation of ultrasonic oscillations: the speed of the oscillations propagation, the scattering background level in relation to the amplitude of the bottom reflection, the oscillations attenuation coefficient. The parameters were determined and compared with the characteristics of the quality of the products and the parameters of the microstructure, which were determined by the methods of quantitative metallography and the statistical characteristics of the relationship between the parameters, were determined. As a result, new quality control procedures for carbide products have been developed. The contiguity characteristics of the carbide skeleton of the sintered cemented carbide were determined by measuring the propagation speed of ultrasonic oscillations. The assessment of the level of porosity with a pore size of less than 1 mm was carried out according to the results of measuring the relative amplitude of the background scattering of ultrasonic oscillations. The proposed methods are non-destructive and are carried out in one cycle with ultrasonic flaw detection, to which 100% of the products are subjected. These techniques have been introduced in the production of carbide rolls by the method of controlled hot vacuum pressing. They have become an integral part of the quality control system for carbide rolls.

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Effect of ultrafine WC contents on the microstructures, mechanical properties and wear resistances of regenerated coarse grained WC-10Co cemented carbides

Cited by 39 publications

References 36 publications

Preparation and toughening mechanism of Mo₂NiB₂‐based cermets with SiC whiskers

Preparation and toughening mechanism of Mo₂NiB₂‐based cermets with SiC whiskers

Effect of the grinding process on the surface quality of ultrafine cemented carbide with different Co content

Development of quality control and structure parameters determination methods for large size products from sintered hard alloys WC-(Co+Ni+Cr) based on analysis of the ultrasonic oscillations spreading parameters

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Effect of ultrafine WC contents on the microstructures, mechanical properties and wear resistances of regenerated coarse grained WC-10Co cemented carbides

Cited by 39 publications

References 36 publications

Preparation and toughening mechanism of Mo2NiB2‐based cermets with SiC whiskers

Preparation and toughening mechanism of Mo2NiB2‐based cermets with SiC whiskers

Effect of the grinding process on the surface quality of ultrafine cemented carbide with different Co content

Development of quality control and structure parameters determination methods for large size products from sintered hard alloys WC-(Co+Ni+Cr) based on analysis of the ultrasonic oscillations spreading parameters

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Preparation and toughening mechanism of Mo₂NiB₂‐based cermets with SiC whiskers

Preparation and toughening mechanism of Mo₂NiB₂‐based cermets with SiC whiskers