Thermal fatigue behaviour of WC-20Co and WC-30(CoNiCrFe) cemented carbide

Emanuelli, Lorena; Pellizzari, M.; Molinari, A.; Castellani, F.; Zinutti, E.

doi:10.1016/j.ijrmhm.2016.06.014

Cited by 23 publications

(9 citation statements)

References 17 publications

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“…However, the raw materials of Co are rare and are thus of high price. Therefore, partly or completely replacing Co is necessary for cost reduction [ 12 , 13 , 14 , 15 ], and Ni is considered to be one of the best alternative choices [ 12 , 13 , 14 , 16 , 17 , 18 , 19 ]. In such a situation, WC-Co-Ni cemented carbides have received extensive attention for replacing WC-Co cemented carbides [ 12 , 13 , 14 , 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

“…As one of the most important thermal properties, thermal conductivity can critically affect the service life of cemented carbides. The higher the thermal conductivity, the more quickly the heat can be released during service, especially in harsh environments [ 18 ]. In such cases, the thermal fatigue behavior does not tend to occur, which can critically improve the service life.…”

Section: Introductionmentioning

confidence: 99%

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Investigations on Thermal Conductivity of Two-Phase WC-Co-Ni Cemented Carbides through a Novel Model and Key Experiments

Wen

Jing

Long³

et al. 2023

Materials

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Excellent thermal conductivity is beneficial for the fast heat release during service of cemented carbides. Thus, thermal conductivity is a significant property of cemented carbides, considerably affecting their service life. Still, there is a lack of systematic investigation into the thermal conductivity of two-phase WC-Co-Ni cemented carbides. To remedy this situation, we integrated experiments and models to study its thermal conductivity varying the phase composition, temperature and WC grain size. To conduct the experiments, WC-Co-Ni samples with two-phase structure were designed via the CALPHAD (Calculation of Phase Diagrams) approach and then prepared via the liquid-phase sintering process. Key thermal conductivity measurements of these prepared samples were then taken via LFA (Laser Flash Analysis). As for modeling, the thermal conductivities of (Co, Ni) binder phase and WC hard phase were firstly evaluated through our previously developed models for single-phase solid solutions. Integrating the present key measurements and models, the values of ITR (Interface Thermal Resistance) between WC hard phase and (Co, Ni) binder phase were evaluated and thus the model to calculate thermal conductivity of two-phase WC-Co-Ni was established. Meanwhile, this model was verified to be reliable through comparing the model-evaluated thermal conductivities with the experimental data. Furthermore, using this developed model, the thermal conductivity of two-phase WC-Co-Ni varying with phase-fraction, temperature and grain size of WC was predicted, which can contribute to its design for obtaining desired thermal conductivities.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigations on Thermal Conductivity of Two-Phase WC-Co-Ni Cemented Carbides through a Novel Model and Key Experiments

Wen

Jing

Long³

et al. 2023

Materials

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“…Both metallic binders and ceramic particles are also damaged in dry environments. The character and the speed of the oxidation in air are closely related to temperature—namely, at about 400 °C, slight oxidation was observed, between 400 and 500 °C selective oxidation of Co binder appeared, and above 500 °C, simultaneous oxidation of the binder and WC phase took place [ 11 , 12 ]. Additionally, temperature can affect the binder properties, so that a temperature dependent fatigue effect takes place at temperatures between 25 and 900 °C, as reported in [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Wear Resistance Improvement of Cemented Tungsten Carbide Deep-Hole Drills after Ion Implantation

et al. 2021

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The paper is dedicated to the life prolongation of the tools designed for deep-hole drilling. Among available methods, an ion implantation process was used to improve the durability of tungsten carbide (WC)-Co guide pads. Nitrogen fluencies of 3 × 1017 cm−2, 4 × 1017 cm−2 and 5 × 1017 cm−2 were applied, and scanning electron microscope (SEM) observations, energy dispersive spectroscopy (EDS) analyses, X-ray photoelectron spectroscopy (XPS) and Secondary Ion Mass Spectrometry (SIMS) measurements were performed for both nonimplanted and implanted tools. The durability tests of nonimplanted and the modified tools were performed in industrial conditions. The durability of implanted guide pads was above 2.5 times greater than nonimplanted ones in the best case, presumably due to the presence of a carbon-rich layer and extremely hard tungsten nitrides. The achieved effect may be attributed to the dissociation of tungsten carbide phase and to the lubrication effect. The latter was due to the presence of pure carbon layer with a thickness of a few dozen nanometers. Notably, this layer was formed at a temperature of 200 °C, much smaller than in previously reported research, which makes the findings even more valuable from economic and environmental perspectives.

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“…High resistance against thermal fatigue and thermal shock are increasingly demanded for WC-Co cemented carbides (Tarragó et al, 2016;Emanuelli et al, 2016;Li et al, 2014;Qi & Zhu, 2015); accordingly, changes of mechanical behavior with temperature is particularly important for their applications. In the literature, the mechanical behavior of WC-Co cemented carbides at high temperatures has been investigated under different loading conditions such as bending (Suzuki et al, 1982;Milman et al, 2002;Mohand et al, 1982;Bolognini et al, 1998;Ö stberg et al, 2006;Acchar et al, 1999), compression (Lay et al, 1987;Teppernegg et al, 2016;Roebuck & Moseley, 2015), tensile tests and internal friction (Buss & Mari, 2004).…”

Section: Introductionmentioning

confidence: 99%

Crystal defects responsible for mechanical behaviors of a WC–Co composite at room and high temperatures – a simulation study

Fang

Liu

et al. 2019

Acta Crystallogr B Struct Sci Cryst Eng Mater

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The microstructure evolution and changes in the structures of crystal defects of the nanocrystalline WC-Co composite in the process of uniaxial compression were studied by simulations at both room and high temperatures. The deformation processes were demonstrated as a function of stress and temperature for the stages prior to and after yielding of the composite. The Peierls stresses were evaluated for Co and WC dislocations with increasing temperature. The deformation mechanisms for each stage of the stress-strain curve were disclosed, in which the effect of temperature was clarified. It was found that with the increase of stress, from elastic deformation to plastic deformation then to yielding of the composite, the dominant mechanisms are grain boundary migration, formation and motion of dislocations in Co, concurrent motion and reaction of dislocations in Co and WC, and then rotation of WC grains in combination with motion of Co and WC dislocations. At the yielding stage, sliding of WC grain boundaries plays an increasingly important role in the contribution to plastic deformation at high temperatures. With strain the proportion of mobile dislocations decreases, and dislocations pile up at triple junctions of WC grains, WC/WC grain boundaries and WC/Co phase boundaries in priority order, leading to the nucleation and propagation of microcracks in these regions.

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Thermal fatigue behaviour of WC-20Co and WC-30(CoNiCrFe) cemented carbide

Cited by 23 publications

References 17 publications

Investigations on Thermal Conductivity of Two-Phase WC-Co-Ni Cemented Carbides through a Novel Model and Key Experiments

Investigations on Thermal Conductivity of Two-Phase WC-Co-Ni Cemented Carbides through a Novel Model and Key Experiments

Wear Resistance Improvement of Cemented Tungsten Carbide Deep-Hole Drills after Ion Implantation

Crystal defects responsible for mechanical behaviors of a WC–Co composite at room and high temperatures – a simulation study

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