Investigations of hot corrosion resistance of HVOF coated Fe based superalloy A-286 in simulated gas turbine environment

Arivarasu, M.

doi:10.1016/j.engfailanal.2019.104224

Cited by 32 publications

(22 citation statements)

References 28 publications

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“…Fe-based amorphous alloys have been studied extensively due to high hardness, good wear and corrosion resistance, and relatively low cost. Meanwhile, with the development of thermal spray technology, Fe-based amorphous materials are quickly introduced into the field of surface engineering [1,2]. For improvement on Fe-based amorphous coatings performance, different kinds of methods were developed such as technology improvement [3], parameter optimization [4], hard phase reinforcement [5], and pre/post-treatment [6,7].…”

Section: Introductionmentioning

confidence: 99%

Synchronous Shot Peening Applied on HVOF for Improvement on Wear Resistance of Fe-based Amorphous Coating

et al. 2020

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Shot peening was used synchronously to improve Fe-based amorphous coating performance by delivering ZrO2 ceramic particles into a low-temperature region of a flame during the high velocity oxygen flame (HVOF) spray process. The coating became denser, and its hardness became higher via the new process. Moreover, the compressive residual stress was induced by shot peening. The results from the dry friction test indicated that the coating’s wear resistance was enhanced obviously. The wear mechanism of coatings with and without shot peening is an abrasive wear combined with an oxidation wear at wear test conditions of a low load and a low frequency. The coating with the best wear resistance did not have the strongest microhardness but had the highest compressive residual stress. The compressive residual stress had a significant positive influence on the wear resistance at a low frequency, while its effect is weakened at a high frequency.

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Section: Introductionmentioning

confidence: 99%

Synchronous Shot Peening Applied on HVOF for Improvement on Wear Resistance of Fe-based Amorphous Coating

et al. 2020

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“…The NiO oxide scale is partially porous in nature, which may allow the oxidizing and corrosive species reach the coating and substrate, as reported by Chatha et al [20]. In this case, the presence of Cr2O3 provides sufficient protection to the weldment [19,22]. The spinel oxide NiCr2O4 is formed by the solid-state reaction between the NiO and Cr2O3 oxide scale [25].…”

Section: Comparison Of Hot Corrosion Behaviors Of the Weldmentsmentioning

confidence: 84%

“…The results indicate that the top surface of the coating mainly consisted of O, Ni, and Cr, which suggested the formation of NiO and Cr2O3 scales. A minor amount of Fe was found in the coating region near the interface, which indicated the diffusion of Fe from the substrate [19].…”

Section: Eds Line Mapping Analysismentioning

confidence: 99%

“…The melting point of the eutectic mixture of the salts is 610ºC, which is much lower than our experiment temperature (900ºC). At 900ºC, the salts Na2SO4 and V2O5 combine to form NaVO3 (Reaction (1), melting point: 610ºC), which serves as an oxygen carrier and increases the oxidation rate [17,19].…”

Section: Comparison Of Hot Corrosion Behaviors Of the Weldmentsmentioning

confidence: 99%

“…The presence of protective chromium-rich scales in the coated specimen enhanced the corrosion resistance. Muthu and Arivarasu [19] deposited Ni−20wt%Cr and Cr3C2−25wt%NiCr coating on the Fe-based alloy A-286 using the HVOF process. Hot corrosion study was performed on the bare and coated specimens in an 87.5wt%Na2SO4−7.5wt%NaVO3−5wt%NaCl environment at 700°C.…”

Section: Introductionmentioning

confidence: 99%

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Improvement in hot corrosion resistance of dissimilar alloy 825 and AISI 321 CO2-laser weldment by HVOF coating in aggressive salt environment at 900°C

Arivarasu

Krishna

Ganguly

et al. 2020

Int J Miner Metall Mater

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This study investigated the hot corrosion performance of a dissimilar weldment of Ni-based superalloy and stainless steel joined by CO2 laser welding and improved by high-velocity oxy-fuel (HVOF) coating in a Na2SO4−60wt%V2O5 atmosphere at 900°C. A dissimilar butt joint of AISI 321 and alloy 825 was fabricated by CO2 laser welding with low heat input after obtaining the optimum welding parameters by bead-on-plate trials. The metallurgical and mechanical properties of the laser weldment were evaluated. The tensile test results indicated the occurrence of fracture in the base metal AISI 321 side. The HVOF process was employed to coat Ni−20wt%Cr on the weldment. To evaluate the surface morphology of the corrosion products formed on the uncoated and HVOF-coated weldments, scanning electron microscopy (SEM) analysis was performed. Energy-dispersive spectroscopy (EDS) was used to determine the different elements present on the surface scales. The existence of oxide phases on the weldments was determined by X-ray diffraction (XRD). The cross sections of the weldments were characterized by SEM with EDS line mapping analysis. The results indicated that the HVOF-coated weldment exhibited superior hot corrosion resistance due to the development of Cr2O3 and NiCr2O4 protective oxide scales.

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Effect of thermal spray coating cermets on superalloy to combat hot corrosion

Sadashiva¹,

Ramappa²,

Natarajan

et al. 2023

Materials & Corrosion

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Burning coal emits contaminant gases that come into contact with turbine parts and speed up hot corrosion. To overcome the corrosion effect, it is necessary to opt for thermal spray coatings that offer resistance to hot corrosion. In the current study, hot corrosion investigations were done on both uncoated and high‐velocity oxygen fuel spray‐coated Superco‐650 alloys at 700°C for 50 cycles, in Na2SO4 + 60% V2O5 salt environment. At the end of each cycle, the weight gains or loss was recorded. We used powder X‐ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy (EDS) to examine the hot corrosion impact. Our finding demonstrated that the uncoated Superco‐605 alloy was subjected to extensive spallation in the form of oxide scale remgoval due to the formation of an unprotected Fe2O3 oxide phase. Contrarily the coated Superco‐605 alloy gained less weight, and the oxide scales remained undamaged. The nickel, chromium oxides, and their sulfide phases were revealed by the EDS examination of the oxide scale over the coated sample, which is presumed to offer resistance to high‐temperature corrosion effects.

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Investigations of hot corrosion resistance of HVOF coated Fe based superalloy A-286 in simulated gas turbine environment

Cited by 32 publications

References 28 publications

Synchronous Shot Peening Applied on HVOF for Improvement on Wear Resistance of Fe-based Amorphous Coating

Synchronous Shot Peening Applied on HVOF for Improvement on Wear Resistance of Fe-based Amorphous Coating

Improvement in hot corrosion resistance of dissimilar alloy 825 and AISI 321 CO2-laser weldment by HVOF coating in aggressive salt environment at 900°C

Effect of thermal spray coating cermets on superalloy to combat hot corrosion

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