Evaluation of the Corrosion Resistance of WC-Co Coating on AZ91 Applied by Electro Spark Deposition

Tabrizi, Arvin Taghizadeh; Pouzesh, Maryam; Laleh, Farhad Farhang; Aghajani, Hossein

doi:10.2478/pmp-2020-0004

Cited by 8 publications

(3 citation statements)

References 57 publications

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“…It also possesses anti-corrosion properties for almost every kind of medium. [46][47][48][49][50] Many researchers have used this MMC (NiCrSiC -WC) in the past and excellent wear resistance properties against erosion, sliding wear, and abrasive wear were reported. 36,37 However, the clads developed by this technique is never used for cavitation erosion environment, according to best knowledge of authors.…”

Section: Ss-304mentioning

confidence: 99%

Effect of variation of WC reinforcement on metallurgical and cavitation erosion behavior of microwave processed NiCrSiC-WC composites clads

Bansal

Kaushal²,

Mago

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Components operating in fluid handling systems most frequently experience cavitation erosion. The coatings/claddings fabricated by microwave irradiation method can remarkably improve cavitation erosion. In the present work, WC reinforced NiCrSiC based metal matrix composite clads with varying weight percentage of WC particles were developed on SS 316 steel using microwave heating method. The metallurgical and microstructural study of composite clads were analyzed using SEM/EDS, XRD and porosity, microhardness was also investigated. Cavitation erosion behavior of the claddings were evaluated using vibratory cavitation erosion tester. The failure mechanism due to cavitation erosion was explored using SEM study. The relationship of cavitation erosion behavior with variation in weight percentage (10%, 20%, and 30%) of reinforced particles in the composite clad was also explored. It has been observed that with an increase in the weight percentage of WC particles, the cavitation erosion rates decreased drastically initially (37.9%) and, but later significant change was not observed (4.89%, 2.44%). Eroded surface study revealed that with increase in the weight percentage of WC reinforcement the mode of damage changes from ductile to brittle. Further it was studied that the pits, crater, micro-cracks, and plastic deformation were the primary wear mechanisms.

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Section: Ss-304mentioning

confidence: 99%

Effect of variation of WC reinforcement on metallurgical and cavitation erosion behavior of microwave processed NiCrSiC-WC composites clads

Bansal

Kaushal²,

Mago

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The hardness of WC-Co cemented carbides is strongly dependent on the content of the Co binder [26], the grain size of WC, and the eta phase [27]. The eta phase enhances the WC-Co but decreases the toughness.…”

Section: Influence Mechanism Of the Addition Of Momentioning

confidence: 99%

Effect of Mo and C Additions on Eta Phase Evolution of WC-13Co Cemented Carbides

Zhang²,

Zhang³

et al. 2022

Coatings

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The WC-13Co (wt.%) cemented carbide was prepared by simple pressureless sintering, and the influence of Mo and C additions on the eta evolution and mechanical properties was analyzed by XRD, SEM, EDS, XPS, and Vickers hardness tester. The results show that the addition of Mo has an important influence on the composition, size, and distribution of the eta phase and Mo2C phase. When the Mo content increases from 0 to 2.5%, the Mo-enriched eta phase grows abnormally and the area fraction of the eta phase significantly increases to 40%, leading to an obvious increase in hardness from 1232 HV30 to 1321 HV30, and a decrease in fracture toughness from 12.5 MPa·m1/2 to 9.8 MPa·m1/2. The addition of carbon black effectively inhibits the formation of the eta phase in the samples with 2.5% Mo. Moreover, adding Mo can suppress WC coarsening in a high-carbon content, which is different from the obvious growth of WC grains in a high-carbon environment in traditional research. Finally, the mechanism of eta phase evolution during the sintering process of WC-Co cemented carbides containing Mo is discussed systematically.

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“…Метод электроискрового разряда широко используется для нанесения покрытий WC−Co на поверхность стали [1][2][3][4][5], Ni [6], Ti [7], сплавов на основе Mg [8] и других типов материалов [8] для улучшения их устойчивости к коррозии и износу. В частности, нанесение покрытий WC−Co на поверхность режущих, шлифовальных и формообразующих инструментов приводит к значительному повышению их стойкости к коррозии и износу, что делает их работу более эффективной в условиях высоких давлений и температур.…”

Section: Introductionunclassified

Электроискровой Синтез Порошка Α-Wc И Исследование Его Фазовых Превращений При Отжиге

Аганян¹,

Костанян²,

Авагян³

et al. 2022

Proceedings of NAS RA. Physics

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В данной работе предложен способ синтеза порошка α-WC методом электроискрового разряда, где в качестве электродных материалов использованы WC 8% Co (анод) и W (катод), а в качестве диэлектрической жидкости использована деионизированная вода. Синтезированный порошок после высушки был подвергнут термическому отжигу в воздушной атмосфере при температурах 250, 400 и 600С в течение 2 ч с целью анализа его термической стабильности и выявления возможных температурно-зависимых фазовых переходов. Фазовый состав, морфология и размеры частиц синтезированного порошка и порошков, подвергнутых термическому отжигу, были исследованы методами порошковой рентгеновской дифракции и сканирующей электронной микроскопии. Синтезированный порошок содержит две фазы: доминирующую фазу α-WC и фазу α-W2C. При температуре отжига 600°С обе фазы α-WC и α-W2C практически полностью переходят в фазу CoWO4. Обсуждены процессы формирования фазовых компонент синтезированного порошка и перехода этих компонент в фазу CoWO4 в результате термического отжига. In this paper, we propose an approach for the direct synthesis of α-WC powder by the electrospark discharge method. WC–8% Co (anode) and W (cathode) were used as electrode materials, and deionized water was used as a dielectric liquid. After drying, the synthesized powder was subjected to thermal annealing in atmospheric air at temperatures of 250, 400, and 600°C for 2 h in order to analyze its thermal stability and possible temperature-dependent phase transitions. The phase composition, morphology, and particle sizes of the synthesized powder and powders subjected to thermal annealing were studied by powder X-ray diffraction and scanning electron microscopy techniques. The synthesized powder contains two phases: the dominant α-WC phase (≈ 90 vol.%) and the α-W2C phase. At annealing temperature of 600°C, both α-WC and α-W2C phases almost completely transform into the CoWO4 phase. The processes of formation of the phase components of the synthesized powder and the transition of these components to the CoWO4 phase as a result of thermal annealing are discussed.

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Evaluation of the Corrosion Resistance of WC-Co Coating on AZ91 Applied by Electro Spark Deposition

Cited by 8 publications

References 57 publications

Effect of variation of WC reinforcement on metallurgical and cavitation erosion behavior of microwave processed NiCrSiC-WC composites clads

Effect of variation of WC reinforcement on metallurgical and cavitation erosion behavior of microwave processed NiCrSiC-WC composites clads

Effect of Mo and C Additions on Eta Phase Evolution of WC-13Co Cemented Carbides

Электроискровой Синтез Порошка Α-Wc И Исследование Его Фазовых Превращений При Отжиге

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