Degradation Behavior of HVOF-Sprayed Cr3C2-25%NiCr Cermet Coatings Exposed to High Temperature Environment

Shukla, Vaibhav Kumar; Jayaganthan, R.; Tewari, Vinay Kumar

doi:10.1016/j.matpr.2015.07.048

Cited by 15 publications

(7 citation statements)

References 24 publications

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“…Nanostructured WC-based and Cr 3 C 2 -25NiCr coating showed low erosion-corrosion and erosion-wear compared to conventional coatings corresponding to highest microhardness value, lower porosity, higher fracture toughness, and lower roughness [6,19,21]. The nano carbide ceramic phase mainly causes wear resistance while the corrosion resistance is provided by the binder phase NiCr matrix of the nanostructured Cr 3 C 2 -25NiCr cermet coatings [73,83,103]. Erosion-corrosion behavior of the nanostructured coatings compared to other conventional coatings mentioned in Table 2 are related to nano-size powder particles, stronger grain strengthening effect, the density of the coating, binder phase, chemical composition, and the more uniform distribution of reinforcement carbides.…”

Section: Aisi 1018 Steel Erosion Corrosion Test Potentiodynamic Polarmentioning

confidence: 97%

“…Hardness of a material is a parameter that is always associated with wear resistance. Wear rate of cermet coatings depends on morphology of powder, the size, shape, and distribution of the carbide particles, hardness of the carbide particles relative to the abrasive media, properties of matrix and its volume portion, and the coating method, which governs the characteristics of coating like the phases, density, micro and macro hardness, and residual stresses [73]. The characteristics and performances of the resulting coatings are strongly influenced by the presence of defects, which corresponds to partly and fully melted particles with oxides, cracks, and porosity, as well as residual stresses [73].…”

Section: Wear Resistance Of Cr 3 C 2 -Nicr and Wc-based Nanostructurementioning

confidence: 99%

“…Wear rate of cermet coatings depends on morphology of powder, the size, shape, and distribution of the carbide particles, hardness of the carbide particles relative to the abrasive media, properties of matrix and its volume portion, and the coating method, which governs the characteristics of coating like the phases, density, micro and macro hardness, and residual stresses [73]. The characteristics and performances of the resulting coatings are strongly influenced by the presence of defects, which corresponds to partly and fully melted particles with oxides, cracks, and porosity, as well as residual stresses [73]. In the case of Cr 3 C 2 -NiCr cermet coatings, it has been reported in the literature that hardness value increases from 846 HV to 1020 HV (20.5% increase) when shifting from microstructured coatings to nanostructured coatings [74,75].…”

Section: Wear Resistance Of Cr 3 C 2 -Nicr and Wc-based Nanostructurementioning

confidence: 99%

“…Erosion and corrosion behavior of the reported coatings is summarized in Table 2. The HVOF spraying process is the preferred process of depositing Cr3C2-NiCr cermet coatings as it exhibits high density, low porosity, as well as excellent adhesive strength, and numerous carbide particles remain in the matrix compared to the plasma spraying process [17,73,[103][104][105][106]. Porosity or voids and surface roughness are the important parameters contributing to higher erosion or corrosion resistance of the Potentiodynamic polarisation studies showed that Cr 3 C 2 -NiCr and hard chromium coatings showed decrease in corrosion current and increase in E corr [102].…”

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Nanocrystalline Cermet Coatings for Erosion–Corrosion Protection

et al. 2019

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The processing techniques, microstructural characteristics, and erosion corrosion behaviour of Cr3C2–NiCr and tungsten carbide (WC)-based cermet coatings are reviewed in this work. Conventional and nanocrystalline Cr3C2–NiCr and WC-based cermet coatings are generally synthesized using thermal spray technique. The wear, erosion, and corrosion protection ability of conventional and nanocermet coatings are compared based on available literature. In Cr3C2–NiCr coatings, the corrosion resistance is offered by NiCr metal matrix while the wear resistance is provided by the carbide ceramic phase, making it suitable for erosion–corrosion protection. The nanocrystalline cermet coatings exhibits better erosion–corrosion resistance as compared to the conventional coatings. The nanocrystalline coatings reduces the erosion–corrosion rate significantly compared to conventional coatings. It is attributed to the presence of the protective NiCr metallic binder that allows easier and faster re-passivation when the coating is subjected to wear and the fine-grain structure with homogeneous distribution of the skeleton network of hard carbide phases. In addition, corrosion-accelerated erosion dominates the reaction mechanism of erosion–corrosion and, therefore, higher hardness, strength, and better wear resistance of nanocermet coating along with its faster repassivation kinetics accounts for improved corrosion resistance as compared to conventional coatings.

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Section: Aisi 1018 Steel Erosion Corrosion Test Potentiodynamic Polarmentioning

confidence: 97%

Section: Wear Resistance Of Cr 3 C 2 -Nicr and Wc-based Nanostructurementioning

confidence: 99%

Section: Wear Resistance Of Cr 3 C 2 -Nicr and Wc-based Nanostructurementioning

confidence: 99%

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confidence: 99%

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Nanocrystalline Cermet Coatings for Erosion–Corrosion Protection

et al. 2019

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“…The characteristics and performances of the resulting coatings are strongly affected by the presence of defects, which correspond to partly and fully melted particles with oxides, cracks, and porosity, as well as residual stresses [3,[12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Structural and Mechanical Properties of Arc-Sprayed Ni–Cr Coating Post-Treated by Surface Mechanical Attrition Treatment (SMAT)

et al. 2018

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This study focuses on the effects of a surface mechanical attrition treatment on the structural and mechanical behavior of arc-sprayed Ni–Cr coatings deposited on steel substrates. The surface of the as-sprayed and SMATed coatings was characterized by X-ray diffraction, Scanning Electron Microscopy, and non-contact profilometry. The coating porosity was evaluated by using image analysis software. The residual stresses were determined using X-ray diffraction with the sin2ψ. Indentation tests were carried out on the cross sections of the different coatings to evaluate their hardness. The wear properties of the coatings were assessed using a pin-on-disk tester at ambient temperature without lubrication. The results showed that surface mechanical attrition treatment (SMAT) induced a grain refinement on the coating surface due to severe plastic deformation, which was associated with a significant improvement of the mechanical properties.

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