Mechanical-property relationships of Co/WC and CoNiFe/WC hard metal alloys

Guilemany, J.M.; Sanchiz, I.; Mellor, B.G.; Llorca, N.; Miguel, J.R.

doi:10.1016/0263-4368(93)90049-l

Cited by 23 publications

(6 citation statements)

References 4 publications

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“…When Al was added to the combination it facilitated the formation of precipitates which raised the strength and conferred creep resistance on the expense of fracture toughness. Another early study by Guilemany et al [50] was performed on Co/WC and Co-Ni-Fe/WC alloys to investigate the developed microstructure and mechanical properties. As for the microstructure, it was observed that hardmetals with pure cobalt is present in its two allotropic forms, FCC and hexagonal close packed while alloys had a face centered cubic structure when Co-Ni-Fe were added to the mixture.…”

Section: The Use Of Other Bindersmentioning

confidence: 99%

The Synthesis of Nanostructured WC‐Based Hardmetals Using Mechanical Alloying and Their Direct Consolidation

Al-Aqeeli

Saheb

Laoui

et al. 2014

Journal of Nanomaterials

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Tungsten carbide- (WC-) based hardmetals or cemented carbides represent an important class of materials used in a wide range of industrial applications which primarily include cutting/drilling tools and wear resistant components. The introduction and processing of nanostructured WC-based cemented carbides and their subsequent consolidation to produce dense components have been the subject of several investigations. One of the attractive means of producing this class of materials is by mechanical alloying technique. However, one of the challenging issues in obtaining the right end-product is the possible loss of the nanocrystallite sizes due to the undesirable grain growth during powder sintering step. Many research groups have engaged in multiple projects aiming at exploring the right path of consolidating the nanostructured WC-based powders without substantially loosing the attained nanostructure. The present paper highlights some key issues related to powder synthesis and sintering of WC-based nanostructured materials using mechanical alloying. The path of directly consolidating the powders using nonconventional consolidation techniques will be addressed and some light will be shed on the advantageous use of such techniques. Cobalt-bonded hardmetals will be principally covered in this work along with an additional exposure of the use of other binders in the WC-based hardmetals.

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Section: The Use Of Other Bindersmentioning

confidence: 99%

The Synthesis of Nanostructured WC‐Based Hardmetals Using Mechanical Alloying and Their Direct Consolidation

Al-Aqeeli

Saheb

Laoui

et al. 2014

Journal of Nanomaterials

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“…An efficient way to control the flame temperature and the velocity of the particles is by decreasing the fuel/oxygen ratio of the gases, and by increasing the flow rate inside the chamber through the injection of inert components (such as N 2 ). The control of these two variables is important, because at higher temperatures and lower particle velocities (which is the case of the HVOF process), the powder particles are more susceptible to undergo decarburization, resulting in undesired phases such as W 2 C and W [6]. In the case of HVAF, the powders do not suffer significant decarburization or oxidation, as they are subjected to lower temperatures and exit the equipment at higher velocities [21].…”

Section: Introductionmentioning

confidence: 99%

Understanding the Influence of High Velocity Thermal Spray Techniques on the Properties of Different Anti-Wear WC-Based Coatings

et al. 2020

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This work analyzes the differences found in hard metal coatings produced by two high velocity thermal spray techniques, namely high velocity oxy-fuel (HVOF) and high velocity air-fuel (HVAF). Additionally, the effect of the metallic matrix and ceramic composition and the original carbide grain size on coating properties is compared to the most studied standard reference material sprayed by HVOF, WC-Co. For this evaluation, the physical properties of the coatings, including feedstock characteristics, porosity, thickness, roughness, hardness, and phase composition were investigated. Several characterization methods were used for this purpose: optical microscopy (OM), scanning electronic microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDS), and X-ray Diffraction (XRD), among others. The final performance (abrasive wear and corrosion resistance) shown by the coatings obtained by these two methodologies was also analyzed. Thus, the abrasive wear resistance was analyzed by the rubber-wheel test, while the corrosion resistance was characterized with electrochemical methods. The characterization results obtained clearly showed that the coatings exhibit different microstructures according to feedstock powder characteristics (carbide grain size and/or composition) and the thermal spray process used for its deposition. Thus, the incorporation of WB to the cermet composition led to a high hardness coating, and the complementary hardness and toughness of the WC-Co coatings justify its better abrasion resistance. The presence of Ni on the metal matrix increases the free corrosion potential of the coating to more noble region. However, the WC-Co coatings show a lower corrosion rate and hence a higher protective performance than the rest of the coatings.

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“…Partial or full substitution of Co with Ni binder phase increases the fracture toughness of Ti(C,N)-based cermets (Ettmayer, Kolaska, Lengauer, & Dreyert, 1995). Substitution of the Co-binder phase by the mixtures like Fe-Co-Ni, Ni-Cr-Mo, Ni-Al, Ni-Cr-Mo-Al, or other combination usually decreases or in some cases produce comparable fracture toughness of WC-based cemented carbides Bolton & Keely, 1983;Guilemany, Sanchiz, Mellor, Llorca, & Miguel, 1994;Prakash, 1993;Tracey, 1992). Partial or complete substitution of Co binder with nanograined ceramics ZrO 2 decreases the fracture toughness in comparison to WC-Co (Mukhopadhyay & Basu, 2011;Mukhopadhyay, Chakravarty, & Basu, 2010).…”

Section: Dependencies On Chemistry Defects and Residual Stressesmentioning

confidence: 95%