Investigation of WC decarburization effect on the microstructure and wear behavior of WC-Ni hardfacing under dry and alkaline wet conditions

Cheniti, Billel; Miroud, Djamel; Hvizdoš, Pavol; Balko, Ján; Sedlák, Richard; Csanádi, Tamás; Belkessa, Brahim; Fides, Martin

doi:10.1016/j.matchemphys.2018.01.052

Cited by 29 publications

(4 citation statements)

References 35 publications

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“…Using the Voigt-Reuss-Hill approximation, the three-dimensional distribution of WC and W 2 C elasticity performance was evaluated by ElasticPOST code [28]. Figure 2 shows the mechanical properties derived from the elastic constants in different directions, the 3D modulus surfaces of WC and W 2 C deviate from the sphere, indicating that the Young's modulus is anisotropic, further predicting the microcracking [29]. Figures 2(a which is more favorable for interfacial bonding and stable interfacial phase formation due to the cluster dragging effect and the ability of W 2 C to maintain good wettability with WC.…”

Section: Thermodynamic Analysis Of Interfacial Reactionsmentioning

confidence: 99%

Preparation of high wear resistance nickel based WC coating by carefully adjusting interface structure

Fan

Ou²,

Rong³

et al. 2022

Mater. Res. Express

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In recent years, many scholars have paid attention to wear-resistant coatings for shield machine cutterheads due to their very high consumption rates. Among these coatings, nickel-based tungsten carbide (Ni-based WC) is one of the best, showing both corrosion resistance and wear resistance. However, to further improve the wear resistance of such coatings, there are still numerous issues that need to be resolved. Herein, a new method, distinct from conventional methods, is presented. Specifically, the brittle phase W2C is not widely regarded as the main wear-resistant phase, but we were surprised to find that careful adjustment of its rigid structure can yield satisfactory results. Experimental results and first-principles simulations have indicated that the friction coefficient and weight loss of a coating with a suitable distribution of W2C are only half of those of a traditional Ni-based WC coating (about five times higher than those of the substrate), which can mainly be attributed to the excellent thermal expansion coefficient and hardness of the W2C phase. As we expected, the surface morphology of the material after wear revealed that the suitable W2C layer has a well-defined friction morphology. We hope to provide new ideas for the study of Ni-based WC coatings in shield machine cutterheads.

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Section: Thermodynamic Analysis Of Interfacial Reactionsmentioning

confidence: 99%

Preparation of high wear resistance nickel based WC coating by carefully adjusting interface structure

Fan

Ou²,

Rong³

et al. 2022

Mater. Res. Express

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show abstract

“…Jindal et al noted that 59% of the publications they evaluated used steel as a base with varying alloying elements [21]. Cheniti et al recognized the significance of giving a protective treatment to the component surface in effort to expand the lifespan of operating components that are susceptible to severe erosion damage during operations [22]. In earlier investigations, erosion-resistant coatings were created using coatings made of a range of materials [23].…”

Section: Literature Reviewmentioning

confidence: 99%

Solid particle erosion behavior of nichrome coated duplex stainless steel

2022

IJATEE

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One of the most serious concerns for the industry is material degradation, which leads to premature failure. Solid particle erosion (SPE) is a significant material degradation phenomenon. To be more specific, the erosion problem is made worse by the fluid inclusion of gravel and other contaminants. Despite being well studied and predicted, the process of solid particle erosion is still not properly known. Therefore, additional experimental research is still required to properly understand the erosion process and offer novel erosion resistance strategies. Employing coatings is the most effective technique to reduce/prevent solid particle erosion. The most commonly used methods to improve erosion resistance are proper material selection and the application of coatings. The erosion behaviour of atmospheric plasma-coated Nichrome (NiCr) on coated and uncoated duplex stainless steel (DSS2205) substrates were investigated. The erosion test is performed using an air-jet erosion tester with alumina as the erodent at velocities of 150, 175 and 200 m/s, impact angles of 30°,45° and 90°, and discharge rates of 2.5, 3.75 and 5 gm/min. This study discovered that the most influential factors of erosion are impact angle. When the impact angle is 90°, the velocity is 150 m/s, and the discharge rate is 5 gm/min, the erosion was minimal. Analysis of the surface microstructure reveals many erosion mechanisms linked to various incidence angles. The erosion mechanism changes from micro-ploughing to plastic deformation for low to high impactangles. Furthermore, metallographic examinations are used in conjunction with the experimental results. As per the experimental findings, coating bare substrates with NiCr can substantially increase erosion resistance. Moreover, NiCr coatings on bare substrates showed a 47% reduction in erosion wear, primarily as a result of their better toughness, higher density, improved micro-hardness, and lower porosity.

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“…According to studies of solid superalloys (Ref 69,70), it can also be assumed that the increased corrosion resistance of the Ni-Cr matrix also lessened the cavitation damage of the coating, but this should be the subject of further research.…”

Section: Cross-sectional Sem Micrographs Of the Eroded Coatingsmentioning

confidence: 99%

Cavitation Resistance of WC-10Co4Cr and WC-20CrC-7Ni HVAF Coatings

et al. 2021

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Machines operating in aqueous environments may be subjected to cavitation damage during operation. This study aims to evaluate the cavitation resistance of WC-10Co4Cr and WC-20CrC-7Ni coatings under cavitation erosion conditions with additional electrochemical effects. The coatings were deposited on AISI 1040 steel substrates using a high velocity air fuel thermal spray process. The microstructure of the coatings was observed by a scanning electron microscope, while their phase composition was analyzed using an energy-dispersive microanalysis system. In addition, the microhardness of the coatings and substrate was measured, and the surface topography of the eroded surface layers was observed using a 3D optical profilometer. The results revealed that the cavitation resistance of the WC-20CrC-7Ni coatings was better than that of the WC-10Co4Cr coatings. The observation of the structure and surface topography made it possible to identity the reasons for the differences between the cavitation resistance of both coatings: The WC-20CrC-7Ni coatings had a finer grain structure, lower pore density, and lower as-sprayed surface roughness. These differences, along with the presence of a high Cr and Ni content in the feedstock powder, that increased the coating corrosion resistance, contributed to improving the cavitation resistance and reducing the material loss of the WC-20CrC-7Ni coatings.Keywords cavitation erosion resistance Á HVAF coatings Á microstructure Á surface topography Á ultrasonic vibration method Á WC-10Co4Cr Á WC-20CrC-7NiThis article is an invited paper selected from presentations at the 2021 International Thermal Spray Conference, ITSC2021, that was held virtually May 25-28, 2021 due to travel restrictions related to the coronavirus (COVID-19) pandemic. It has been expanded from the original presentation.

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Investigation of WC decarburization effect on the microstructure and wear behavior of WC-Ni hardfacing under dry and alkaline wet conditions

Cited by 29 publications

References 35 publications

Preparation of high wear resistance nickel based WC coating by carefully adjusting interface structure

Preparation of high wear resistance nickel based WC coating by carefully adjusting interface structure

Solid particle erosion behavior of nichrome coated duplex stainless steel

Cavitation Resistance of WC-10Co4Cr and WC-20CrC-7Ni HVAF Coatings

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