Microstructure, grain size distribution and grain shape in WC–Co alloys sintered at different carbon activities

Borgh, Ida; Hedström, Peter; Persson, Tomas; Norgren, Susanne; Borgenstam, Annika; Ågren, John; Odqvist, Joakim

doi:10.1016/j.ijrmhm.2013.12.007

Cited by 35 publications

(9 citation statements)

References 16 publications

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“…Furthermore, C variation has shown to affect the dissolution of carbide elements during LPS of hardmetals and cermets [90][91][92]. Its addition has also proven to influence carbide growth phenomena in hardmetals [36,[93][94][95][96][97] and other hard materials [98]. As stated in the investigation of Borgh et al [96,97], high C activity resulted in particle coarsening and a more uniform distribution of their size.…”

Section: • Alternative Metallic Phasementioning

confidence: 99%

“…Its addition has also proven to influence carbide growth phenomena in hardmetals [36,[93][94][95][96][97] and other hard materials [98]. As stated in the investigation of Borgh et al [96,97], high C activity resulted in particle coarsening and a more uniform distribution of their size. These features are attributed to the lowering of interfacial energy and the promotion of nucleation of new atomic layers when C content is increased.…”

Section: • Alternative Metallic Phasementioning

confidence: 99%

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Phase diagrams in alternative hard materials: Validation of thermodynamic simulation through high temperature x-ray diffraction, differential thermal analysis and microstructural characterization

Nicolás

Pereira

Penoy

et al. 2021

International Journal of Refractory Metals and Hard Materials

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Estos cuatro años han sido todo un aprendizaje, tanto en el plano profesional como en el personal. Y durante esta trayectoria me han acompañado personas sin las cuales no habría logrado esta ansiada meta y a las que me gustaría dar las gracias.En primer lugar, a mis directores de tesis, Elena y Luis. Gracias por vuestro tiempo y guía durante esta carrera de fondo. He aprendido de vosotros en muchísimos aspectos, me habéis enseñado a volar sola sin dejar de estar cuando lo he necesitado. Gracias por vuestro apoyo y por los muchos congresos a los que hemos ido juntos. Guardo con especial cariño en mi memoria el de Tailandia, con celebración de cumpleaños incluida.A Irene Fernández Villegas y José Manuel Torralba, porque con vosotros empezó la locura de la investigación. Irene, te agradeceré siempre el enseñarme a valorarme tanto a mí misma como a mi trabajo.A mi grupo de investigación en Madrid -GTP -por el buen trato, ambiente y apoyo. En especial a Toñi,

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Section: • Alternative Metallic Phasementioning

confidence: 99%

Section: • Alternative Metallic Phasementioning

confidence: 99%

Phase diagrams in alternative hard materials: Validation of thermodynamic simulation through high temperature x-ray diffraction, differential thermal analysis and microstructural characterization

Nicolás

Pereira

Penoy

et al. 2021

International Journal of Refractory Metals and Hard Materials

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“…Coalescence is a process where small neighboring particles (or grains) merge to form larger particles; this process occurs if high enough contiguous areas are in contact between two or more existing WC grains, leading to the elimination of contiguous grain boundaries if sufficient activation energy is provided [30][31][32]. This contiguity may be favored due to different conditions, including incomplete wetting of WC particles in the liquid phase, low binder phase content, inhomogeneous dispersion of WC particles in the liquid phase, similar preferred orientation between WC grains, faced shaped WC particles, and even grain rotation [26,[32][33][34][35][36]. Coalescence is a process where small neighboring particles (or grains) merge to form larger particles; this process occurs if high enough contiguous areas are in contact between two or more existing WC grains, leading to the elimination of contiguous grain boundaries if sufficient activation energy is provided [30][31][32].…”

Section: Effect Of the Averange Energymentioning

confidence: 99%

Effect of the Average Energy on WC Grain Growth of WC-10Co-4Cr Composite by Laser Cladding

López-Baltazar

Ruiz-Luna

Hernández

et al. 2019

Metals

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In the present study, the microstructure evolution of WC-10Co-4Cr powder deposited on AISI-SAE 1020 steel substrate by laser cladding was evaluated, considering the effect of average energy per unit area. Single tracks were obtained by employing a Yb: YAG laser system with selected processing parameters. All samples were sectioned in the transverse direction for further characterization of the cladding. Results showed that dilution lay within 15% and 25%, whereas porosity was measured below 12%. According to microstructural analyses, considerable grain growth is developed within the central area of the cladding (namely, the inner region); additionally, the development of a triangular and/or polygonal morphology for WC particles along with a clear reduction in hardness was observed when employing a high average energy. It is worth noting that, in spite of the rapid thermal cycles developed during laser cladding of WC-10Co-4Cr, grain growth is attributed to a coalescence mechanism due to complete merging of WC into larger particles. Finally, the presence of small round or ellipsoidal particles within the inner region of the cladding suggested that non-merged particles occurred due to both an inhomogeneous dispersion and the lack of faced-shaped WC particles.

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“…Neither the brittle eta nor the soft graphite phase is desired in the sintered structure. Borgh et al [20] found that carbon activity affected the microstructure, grain size distribution and grain shape of cemented carbides. Sugiyama et al [21] reported that the grain growth mechanism and grain growth inhibition mechanism in VC-doped WC-Co cemented carbides mainly depend on the carbon content.…”

Section: Introductionmentioning

confidence: 99%

Investigation of WC–Co alloy properties based on thermodynamic calculation and Weibull distribution

Tian

Chen

Zhu

et al. 2019

Materials Science and Technology

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The influence of alloy composition and sintering temperature on the mechanical properties and reliability of WC–Co cemented carbides was studied theoretically and experimentally. For the first time, through a hybrid approach of thermodynamic calculations and Weibull distribution, the comprehensive performance of ultrafine WC–Co cemented carbides with different C contents and inhibitor type was investigated in detail. The carbon content of WC–10 wt-% Co–0.5 wt-% Cr cemented carbides was carefully controlled within the range of 5.38−5.52 wt-%. The contents of Cr and V are chosen to be in the range of 0–1 wt-%. It is found that WC–10 wt-% Co–0.5 wt-% Cr alloys with 5.46 wt-% C or 5.5 wt-% C show excellent mechanical properties and high reliability. WC–10 wt-% Co alloys with 0.5 wt-% Cr and 0.4 wt-% Cr–0.2 wt-% V demonstrate high mechanical property and reliability. The results of this study can be used to design process parameters during the manufacture of WC–Co cemented carbides.

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Microstructure, grain size distribution and grain shape in WC–Co alloys sintered at different carbon activities

Cited by 35 publications

References 16 publications

Phase diagrams in alternative hard materials: Validation of thermodynamic simulation through high temperature x-ray diffraction, differential thermal analysis and microstructural characterization

Phase diagrams in alternative hard materials: Validation of thermodynamic simulation through high temperature x-ray diffraction, differential thermal analysis and microstructural characterization

Effect of the Average Energy on WC Grain Growth of WC-10Co-4Cr Composite by Laser Cladding

Investigation of WC–Co alloy properties based on thermodynamic calculation and Weibull distribution

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