Effect of electro spark deposition process parameters on WC-Co coating on H13 steel

Salmaliyan, M.; Ghaeni, F. Malek; Ebrahimnia, Mohamad

doi:10.1016/j.surfcoat.2017.04.040

Cited by 51 publications

(23 citation statements)

References 5 publications

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“…Изображения поперечного сечения покрытий WC2 и WC6 показаны на Рис. разрядов [20]. Осажденные покрытия не имели четкой границы с подложкой и продольных трещин, что может свидетельствовать о хорошей адгезии осажденного слоя с подложкой.…”

Section: результаты и обсуждениеunclassified

Electrospark deposition of tungsten carbide powder on titanium alloy Ti6Al4V

2021

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Titanium alloys are attracting the attention of researchers and engineers because of their unique combination of high specific strength, corrosion resistance and biocompatibility, but they are characterized by high wear. Therefore, the study of new methods for making protective coatings on titanium alloys is relevant. A mixture of titanium granules with tungsten carbide powder was used to prepare coatings on the titanium alloy Ti6Al4V by the method of electrospark granules deposition. Three mixtures of granules with a tungsten carbide content of 2.1, 4.1 and 6.0 vol.% were prepared. According to the data of X-ray analysis, it was found that the following phases were observed in the composition of the coatings: WC, W 2 C, W, αTi and β-(W, Ti)C 1−x . Carbides W 2 C, (W, Ti)C 1−x and metallic tungsten were formed as a result of the decarburization of WC upon its interaction with molten titanium under the conditions of an electric discharge. Large inclusions of tungsten carbide surrounded by a metallic Ti-W-C binder were observed in the microstructure of the coatings. According to the data of energy dispersive analysis, the concentrations of tungsten and carbon decreased when scanning from the surface layers of the coating to the substrate. The average values of the microhardness of the coatings increased from 7.9 to 9.2 GPa with an increase in the concentration of WC powder in the mixture of granules. The average values of the friction coefficients of the coatings were in the range of 0.33 -0.48, which is 35 ± 3 % lower than that of the Ti6Al4V alloy. Tests for wear in the dry friction mode at loads of 25 and 70 N showed that the wear rate of the coatings ranged from 0.38 ×10 −5 to 1.68 ×10 −5 mm 3 / Nm. The best wear resistance under both loads was demonstrated by the coatings deposited with the addition of 4.1 vol.% WC, which make it possible to increase the wear resistance of the Ti6Al4V alloy up to 18 times. Thus, the prospect of electrospark deposition of cermet coatings with enhanced mechanical properties on a titanium alloy using tungsten carbide powder mixed with titanium granules is shown.

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Section: результаты и обсуждениеunclassified

Electrospark deposition of tungsten carbide powder on titanium alloy Ti6Al4V

2021

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“…Изображение поперечного сечения покрытия Ti-C-Cr 7.4 показано на Рис. 2 а. В структуре покрытия наблюдаются немногочисленные поры и поперечные трещины, возникновение которых, принято объяснять выделением газов и различием в коэффициентах теплового расширения покрытия и подложки в процессе ЭИЛ, соответственно [17]. Электроискровое покрытие не имеет четкой границы с подложкой и продольных трещин, что может свидетельствовать о хорошей адгезии осажденного слоя с подложкой.…”

Section: результаты и обсуждениеunclassified

Electrospark deposition of coatings using Cr3C2 powder and their characterization

Бурков¹,

Kulik²

2019

Lett. Mater.

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A mixture of titanium granules with chromium carbide powder Cr 3 C 2 was employed to prepare TiC -Cr coatings on Ti6Al4V titanium alloy using electrospark treatment in granules. Three mixtures of granules with a chromium carbide content of 2.7; 5.1 and 7.4 vol.% were prepared. According to X-ray analysis, it was found that titanium carbide, αTi, chromium and carbide Cr 7 C 3 were observed in the composition of coatings. Titanium carbide was formed as a result of decarburization of Cr 3 C 2 when interacting with molten titanium under the action of electric discharges. The average thickness of the coatings increased from 18 to 34 μm with an increase in the content of Cr 3 C 2 powder in the mixture of granules. Grains of titanium carbide with a dendritic structure, surrounded by a Ti-Cr binder, were observed in the microstructure of the coatings. According to the EDS data, the concentrations of chromium and carbon decreased when scanning from the surface layers of the coating to the substrate. With an increase in the concentration of Cr 3 C 2 powder in the mixture of granules from 2.7 to 5.1 vol.% hardness of coatings increased from 5.2 to 10.6 GPa. This is 1.7-3.5 times higher than that of the Ti6Al4V alloy. Dry sliding wear tests showed that the TiC -Cr coatings had a wear rate ranging from 0.41 to 2.38 ×10 −6 mm 3 / Nm. Thus, these can improve the wear resistance of the Ti6Al4V alloy from 18 to 107 times. Testing of the samples for resistance to high-temperature gas corrosion at 900°C for 100 hours showed that the technology of electric spark treatment in a mixture of titanium granules with 7.4 vol.% of chromium carbide powder allows increasing the oxidation resistance of the alloy Ti6Al4V three times.

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“…With the increase of TiC fraction, the laser alloying zone's microstructure was refined and the microhardness was increased. Salmaliyan et al [18] studied the effect of ESD process parameters on WC-Co coating with substrate of H13 steel. The results indicate that the crack propagation properties of the coating at low spark energy are different from those at high spark energy.…”

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confidence: 99%

Preparation and Properties of Mo Coating on H13 Steel by Electro Spark Deposition Process

Wang

Zhang

et al. 2021

Materials

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H13 steel is often damaged by wear, erosion, and thermal fatigue. It is one of the essential methods to improve the service life of H13 steel by preparing a coating on it. Due to the advantages of high melting point, good wear, and corrosion resistance of Mo, Mo coating was fabricated on H13 steel by electro spark deposition (ESD) process in this study. The influences of the depositing parameters (deposition power, discharge frequency, and specific deposition time) on the roughness of the coating, thickness, and properties were investigated in detail. The optimized depositing parameters were obtained by comparing roughness, thickness, and crack performance of the coating. The results show that the cross-section of the coating mainly consisted of strengthening zone and transition zone. Metallurgical bonding was formed between the coating and substrate. The Mo coating mainly consisted of Fe9.7Mo0.3, Fe-Cr, FeMo, and Fe2Mo cemented carbide phases, and an amorphous phase. The Mo coating had better microhardness, wear, and corrosion resistance than substrate, which could significantly improve the service life of the H13 steel.

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Effect of electro spark deposition process parameters on WC-Co coating on H13 steel

Cited by 51 publications

References 5 publications

Electrospark deposition of tungsten carbide powder on titanium alloy Ti6Al4V

Electrospark deposition of tungsten carbide powder on titanium alloy Ti6Al4V

Electrospark deposition of coatings using Cr3C2 powder and their characterization

Preparation and Properties of Mo Coating on H13 Steel by Electro Spark Deposition Process

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