Analysis of microstructure, mechanical indentation and corrosive behavior of a thermally sprayed NiFeCrBSi-WC composite coating

Azzoug, Rabah; Mebdoua, Yamina; Hellal, Fatah; Marra, Francesco

doi:10.1016/j.jallcom.2021.163505

Cited by 18 publications

(4 citation statements)

References 42 publications

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“…The coating forms then a compact passive film that protects it against the sulfur ions. As compared to Rabah et al [19] findings, it results that the corrosive behavior of this coating is better.…”

Section: Electrochemical Characterizationmentioning

confidence: 46%

Microstructural, Mechanical and Electrochemical Characterization of a Flame Sprayed NiFeCrBSi/WC Cermet Coating

Azzoug

Mebdoua

Hellal

2022

ENPESJ

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To increase the lifetime of drilling bits, these components are usually covered with hard metal matrix composites. Nowadays, nickel based metal matrix composites arise as substitutes to cobalt-based ones. The challenge now is to provide an efficient coating with low cost. The aim of this paper is to exploit the characteristics of a newly designed flame sprayed NiFeCrBSi-WC composite coatings. The experimental activities were carried out using the scanning electron microscopy, for the microstructural analysis of coating. Additionally, micro-hardness and nano-indentation tests were carried out to evaluate the resistance of the coatings against penetration. Moreover, the electrochemical behavior was assessed in NaCl and Na2SO4 aqueous solutions. The ionic concentrations were varied between 1 g/l to 35 g/l. The results show that the microstructure is dendritic and characterized by the presence of hard chromium carbides and nickel grains in the inter-dendritic space. The coating was subject to a slight decarburization. The presence of carbides and the decarburization make the microhardness of the matrix fluctuates between 300 HV to 900 HV. For the electrochemical response, the increase in ion concentration induces a decrease in the corrosion resistance. In Na2SO4 aqueous solutions, the charge transfer is roughly constant for the concentrations above 1 g/l.

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Section: Electrochemical Characterizationmentioning

confidence: 46%

Microstructural, Mechanical and Electrochemical Characterization of a Flame Sprayed NiFeCrBSi/WC Cermet Coating

Azzoug

Mebdoua

Hellal

2022

ENPESJ

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“…Since the content of the chemical elements cannot be varied indefinitely to improve the alloy or the resulting coatings, other developments in terms of novel deposition techniques, post-processing, or the introduction of reinforcing particles have been proposed. Although new methods, such as one-step atmospheric plasma spraying deposition [ 4 ] or powder laser cladding with no further post-processing, were recently reported [ 5 ], most of the state-of-the-art Ni-based self-fluxing alloy coatings need further remelting [ 6 , 7 , 8 , 9 ]. Post-processed coatings show improvement in fracture toughness and overall improved mechanical performance [ 10 ], as well as an increase in wear and corrosion resistance [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Considerations on the Wear Behavior of Vacuum-Remelted ZrO2-Reinforced Self-Fluxing Ni-Based Thermally Sprayed Alloys

Kazamer¹,

Muntean

Uţu

et al. 2023

Materials

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Without proper post-processing (often using flame, furnace, laser remelting, and induction) or reinforcements’ addition, Ni-based flame-sprayed coatings generally manifest moderate adhesion to the substrate, high porosity, unmelted particles, undesirable oxides, or weak wear resistance and mechanical properties. The current research aimed to investigate the addition of ZrO2 as reinforcement to the self-fluxing alloy coatings. Mechanically mixed NiCrBSi-ZrO2 powders were thermally sprayed onto an industrially relevant high-grade steel. After thermal spraying, the samples were differently post-processed with a flame gun and with a vacuum furnace, respectively. Scanning electron microscopy showed a porosity reduction for the vacuum-heat-treated samples compared to that of the flame-post-processed ones. X-ray diffraction measurements showed differences in the main peaks of the patterns for the thermal processed samples compared to the as-sprayed ones, these having a direct influence on the mechanical behavior of the coatings. Although a slight microhardness decrease was observed in the case of vacuum-remelted samples, the overall low porosity and the phase differences helped the coating to perform better during wear-resistance testing, realized using a ball-on-disk arrangement, compared to the as-sprayed reference samples.

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“…The available literature presents the results of laboratory tests of abrasion resistance of both overlay welding layers with high-alloy chromium cast iron [6,8,[15][16][17][18][19] and flamesprayed coatings with nickel-based powder [20][21][22][23][24]. However, there was no quantitative data enabling the comparison of the wear intensity of layers and coatings applied to guides and active armour in real conditions.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Wear Resistance of Overlay Welded Layers and Thermal Sprayed Coatings in Real Conditions

Szymura,

Gąsiorek,

Czupryński

et al. 2023

Materials

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Tribological tests in real conditions enable obtaining full data on the life of interacting machine parts. This article presents the results of operational tests on the elements of the support ring guidance system in a vertical ball-race mill. The guide and active armour operate under abrasive wear conditions with moderate-impact loads. The wear resistance of elements with overlay welding layers deposited with flux cored wire with a structure of high-alloy chrome cast iron and with a coating flame-sprayed with nickel-based powder was compared. The wear intensity of the overlay weld deposits was much lower than that of the sprayed coatings. The scope of this study also included the analysis of the chemical and phase composition, macro- and microscopic metallographic examinations, and the measurement of the hardness of the deposited layers and coatings.

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Analysis of microstructure, mechanical indentation and corrosive behavior of a thermally sprayed NiFeCrBSi-WC composite coating

Cited by 18 publications

References 42 publications

Microstructural, Mechanical and Electrochemical Characterization of a Flame Sprayed NiFeCrBSi/WC Cermet Coating

Microstructural, Mechanical and Electrochemical Characterization of a Flame Sprayed NiFeCrBSi/WC Cermet Coating

Considerations on the Wear Behavior of Vacuum-Remelted ZrO2-Reinforced Self-Fluxing Ni-Based Thermally Sprayed Alloys

Comparison of Wear Resistance of Overlay Welded Layers and Thermal Sprayed Coatings in Real Conditions

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