Effects of gradient structure on the microstructures and properties of coated cemented carbides

Chen, Li; Wu, Enxi; Yin, Fei; Li, Jia

doi:10.1016/s1005-8850(06)60075-3

Cited by 22 publications

(7 citation statements)

References 16 publications

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“…Because of the difference in thermal expansion between the coating and substrate, cracks are formed in the coating during cooling after the CVD. These cracks might easily propagate into the substrate and cause failure during machining 3 . Some studies show that the gradient cemented carbide with enriched in binder phase can prevent the crack propagation due to its high surface toughness.…”

Section: Introductionmentioning

confidence: 99%

Effect of high‐energy ball milling on the microstructure and properties of ultrafine gradient cemented carbides

Zhou

Wang

et al. 2020

Int J Applied Ceramic Tech

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Planetary low‐temperature high‐energy ball mill was used for preparing the mixed powders with different particle sizes by adjusting the milling time. The ultrafine grain gradient cemented carbides were prepared by sinter‐HIP treatment. The effects of milling time on the gradient formation, grain growth, and mechanical properties of ultrafine grain gradient cemented carbides were investigated. The results show that the high‐energy ball milling cannot effectively reduce the particle size of mixed powder with short milling time. In addition, the particle size of the mixed powder is significantly reduced, while the specific surface area is significantly increased when the ball milling time exceeds 25 hours. The gradient layer thickness and the grain size increase at the beginning and then decrease when the mixed powder particle size was decreased. Simultaneously, the density, hardness, and fracture toughness of the alloy increase gradually. On the contrary, the number of WC with abnormal grain growth is significantly increased. The thickness of the gradient layer reached 32 μm, and the mean WC grain size is 314 nm. Based on the analyzed results, an optimized gradient layer thickness, grain size, density, and hardness can be obtained when the ball milling time is 35 hours.

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Section: Introductionmentioning

confidence: 99%

Effect of high‐energy ball milling on the microstructure and properties of ultrafine gradient cemented carbides

Zhou

Wang

et al. 2020

Int J Applied Ceramic Tech

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“…And the formed cracks might easily propagate into the substrate to cause failure when coating tools are employed in metal machining. [5] When gradient cemented carbides are used as the substrate of coated inserts, the surface gradient layer, which is free of cubic phases and enriched in binder phase, can prevent the crack formed in the coating from propagating into the bulk and causing failure, and hence extend the service lifetime of inserts. [6] Many investigators have studied the gradient zone formation in the cemented carbides.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Computer Simulation of Gradient Zone Formation in WC-Ti(C,N)-TaC-NbC-Co Cemented Carbides

Zhang

Peng

Zhou

et al. 2013

J. Phase Equilib. Diffus.

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The thermodynamic and diffusion databases for multi-component W-C-Co-Ti-Ta-Nb-N cemented carbides have been developed through a combination of experimental, theoretical and assessment work. Using the CALPHAD approach, the thermodynamic database has been established based on the literature information and experimental investigations. The diffusion database contains the atomic mobility parameters for different diffusing elements in liquid, which were calculated by a modified Sutherland equation. According to the present thermodynamic and diffusion databases, a gradiently sintered WC-Ti(C,N)-(Ta,Nb)C-Co cemented carbides has been designed and prepared. Scanning electron microscopy was employed to investigate the microstructure of the gradient zone, and electron probe microanalysis was used to determine the concentration profiles and distributions of the elements. The gradient zone formation of the cemented carbides was then simulated by DICTRA, and the simulation results show a good agreement with the experimental results.

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“…Lately, the appearance of cemented carbides tools with single or multilayer wear resistance coatings, such as TiC, TiN, or Al 2 O 3 , provides an improved combination property compared to the uncoated alloy [4][5][6]. However, because the coating is often obtained by the high-temperature chemical vapor deposition technique (CVD) [7], cracks would be introduced into the coating unavoidably due to the high deposition temperature and large difference in thermal expansion coefficient between the coating and bulk materials, and the cracks might easily propagate into the substrate metal to cause failure when coating tools are employed in metal machining [8].…”

Section: Introductionmentioning

confidence: 99%

Growth kinetics of cubic carbide free layers in graded cemented carbides

Shi

Liu

Huang

et al. 2012

Int J Miner Metall Mater

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In order to reveal the formation mechanism of cubic carbide free layers (CCFL), graded cemented carbides with CCFL in the surface zone were fabricated by a one-step sintering procedure in vacuum, and the analysis on microstructure and element distribution were performed by scanning electron microscopy (SEM) and electron probe micro-analyzer (EPMA), respectively. A new physical model and kinetic equation were established based on experimental results. Being different from previous models, this model suggests that nitrogen diffusion outward is only considered as an induction factor, and the diffusion of titanium through liquid phase plays a dominative role. The driving force of diffusion is expressed as the differential value between nitrogen partial pressure and nitrogen equilibrium pressure essentially. Simulation results by the kinetic equation are in good agreement with experimental values, and the effect of process parameters on the growth kinetics of CCFL can also be explained reasonably by the current model.

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Effects of gradient structure on the microstructures and properties of coated cemented carbides

Cited by 22 publications

References 16 publications

Effect of high‐energy ball milling on the microstructure and properties of ultrafine gradient cemented carbides

Effect of high‐energy ball milling on the microstructure and properties of ultrafine gradient cemented carbides

Experimental Investigation and Computer Simulation of Gradient Zone Formation in WC-Ti(C,N)-TaC-NbC-Co Cemented Carbides

Growth kinetics of cubic carbide free layers in graded cemented carbides

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