Effect of Heat Treatment on the Microstructure and Properties of HVOF-Sprayed Co-Cr-W Coating

Houdková, Šárka; Smazalová, Eva; Pala, Zdeněk

doi:10.1007/s11666-015-0365-5

Cited by 44 publications

(29 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As can be seen in this figure, the hardness of the coatings, produced under the substrate temperatures of 400 and 500°C, are way higher than the substrate metal (316L stainless steel). Due to the nature of their chemical bonding, ceramic compounds have stronger bonds than metals and as the result have higher resistance to indentation . However, it can be clearly seen in Figure that the hardness of the tungsten carbide substantially increased with increasing the temperature of the substrate during the HFCVD process.…”

Section: Resultsmentioning

confidence: 99%

“…As observed in the XRD results, increasing the temperature of the substrate leads to the formation of WC, W 2 C compounds. On the other hand, tungsten carbide is a ceramic compound that substantially increases the hardness of the coatings . Therefore, as the amount of the tungsten carbide increased by increasing the substrate temperature, the hardness of the coating was increased as well.…”

Section: Resultsmentioning

confidence: 99%

“…Due to the nature of their chemical bonding, ceramic compounds have stronger bonds than metals and as the result have higher resistance to indentation. [26][27][28][29][30][31] However, it can be clearly seen in substantially increased with increasing the temperature of the substrate during the HFCVD process. As observed in the XRD results, increasing the temperature of the substrate leads to the formation of WC, W 2 C compounds.…”

Section: Microstructural Observations and Phase Analysismentioning

confidence: 99%

“…On the other hand, tungsten carbide is a ceramic compound that substantially increases the hardness of the coatings. 26,27 Therefore, as the amount of the tungsten carbide increased by increasing the substrate temperature, the hardness of the coating was increased as well. Overall, the results of microhardness in this investigation was in accordance with the results of Suresh Babu et al, 32 Ortiz et al 33 and Deschuyteneer et al 34 These investigators independently reported that tungsten carbide improves the hardness of the ceramic coatings.…”

Section: Microstructural Observations and Phase Analysismentioning

confidence: 99%

See 3 more Smart Citations

The effect of substrate temperature on microstructural evolution and hardenability of tungsten carbide coating in hot filament chemical vapor deposition

Sabzi

Anijdan

Asadian

2018

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

Effect of substrate temperature on microstructural evolution and hardenability of tungsten carbide coating produced by hot filament chemical vapor deposition (HFCVD) process was studied. Annealed sheets of 316L stainless steels were used as the substrate. HFCVD technique, with substrate temperatures of 400 and 500°C, was used to deposit tungsten carbide coating on these sheets. Field Emission Scanning Electron Microscope (FE‐SEM) was used to study the evolution of microstructure. X‐Ray Diffraction spectroscopy was used to analyze the phases formed and Raman spectroscopy was employed to differentiate molecular composition of the coatings. The amount of the porosity of the coatings was measured and Vickers hardness measurement was used for hardness assessment. Results show that the tungsten carbide coatings have a honeycomb structure and increasing the temperature of the substrate increases the amount of porosity of the coating. XRD results showed that 3 different crystalline structures containing W, WC, and W2C were formed in the coating deposited on the 316L stainless steel. Increasing the temperature of the deposition has increased the intensity of the peaks in the XRD results. Raman spectroscopy results indicated the presence of a carbon in the tungsten carbide coatings. Finally, microhardness of the tungsten carbide coating increases with increasing the temperature of the substrate.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Microstructural Observations and Phase Analysismentioning

confidence: 99%

Section: Microstructural Observations and Phase Analysismentioning

confidence: 99%

See 2 more Smart Citations

The effect of substrate temperature on microstructural evolution and hardenability of tungsten carbide coating in hot filament chemical vapor deposition

Sabzi

Anijdan

Asadian

2018

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

show abstract

“…Even though stacking faults were reported to enhance the wear resistance of cobalt base alloys [8], it is not a universally accepted opinion. Moreover, the presence of stacking faults bears even more significance for the coatings and clads which have been reported several times as carbide-free [9] in stark contrast to both cast and wrought stellites.…”

Section: Introductionmentioning

confidence: 99%

Laser Clad and HVOF-Sprayed Stellite 6 Coating in Chlorine-Rich Environment with KCl at 700 °C

et al. 2017

View full text Add to dashboard Cite

Laser clads and HVOF coatings from a stellite 6 alloy (Co-Cr-W-C alloy) on 304 stainless steel substrates were exposed both bare and with KCl deposits in 500 ppm HCl with 5% O 2 for 250 h at 700°C. SEM/EDX and PXRD analyses with Rietveld refinement were used for assessment of the attack and for analysis of the scales. The bare samples suffered from scale spallation and the scale was mostly composed of Cr 2 O 3 , CoCr 2 O 4 and CoO, although due to dilution haematite (Fe 2 O 3 ) was detected in the scale formed on the laser clad sample. A small amount of hydrated HCl was detected in bare samples. While the corrosion of the bare surfaces was limited to comparatively shallow depths and manifested by g and M 7 C 3 carbide formation, the presence of KCl on the surface led to severe Cr depletion from the HVOF coating (to 1 wt%). Both inward and outward diffusion of elements occurred in the HVOF coating resulting in Kirdendall voids at the coatingsteel interface. The laser clad sample performed significantly better in conditions of the KCl-deposit-induced corrosion. In addition to the oxides, CoCl 2 was detected in the HVOF sample and K 3 CrO 4 was detected in the laser clad sample. Thermodynamic calculations and kinetic simulations were carried out to interpret the oxidation and diffusion behaviours of coatings.

show abstract

Comparative investigation on mechanical properties of iron alloy based coating material: A comprehensive review

Sharma,

Das,

Kumar

2023

Materialwissenschaft Werkst

View full text Add to dashboard Cite

The primary focus of this paper is to review the latest developments in iron based amorphous/nanocrystalline high velocity oxy fuel coatings. The extensive development towards the enhancement in the mechanical properties such as micro‐hardness, compressive strength, adhesion strength etc. and comparative investigations are the key objectives set by the coating material scientist. The industrial application fields of iron alloy based coating are growing rapidly and owing to the rapid increase in industrial applications, there are many more advancements in the coating deposition techniques. In the present review, various factors influencing mechanical performance of high velocity oxy fuel coating material have been listed and ranked according to the level of influence. It can be concluded that the mechanical performance of coating materials is significantly influenced by coating parameters, including spray distance, oxygen fuel ratio, coating thickness, and number of layers.

show abstract

Effect of Heat Treatment on the Microstructure and Properties of HVOF-Sprayed Co-Cr-W Coating

Cited by 44 publications

References 54 publications

The effect of substrate temperature on microstructural evolution and hardenability of tungsten carbide coating in hot filament chemical vapor deposition

The effect of substrate temperature on microstructural evolution and hardenability of tungsten carbide coating in hot filament chemical vapor deposition

Laser Clad and HVOF-Sprayed Stellite 6 Coating in Chlorine-Rich Environment with KCl at 700 °C

Comparative investigation on mechanical properties of iron alloy based coating material: A comprehensive review

Contact Info

Product

Resources

About