Effects of Spray Parameters and Post-spray Heat Treatment on Microstructure and Mechanical Properties of Warm-Sprayed Ti-6Al-4V Coatings

Molak, Rafał M.; Araki, Hiroshi; Watanabe, Makoto; Katanoda, Hiroshi; Ohno, Naoyuki; Katayama, Seiji

doi:10.1007/s11666-016-0494-5

Cited by 16 publications

(7 citation statements)

References 33 publications

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“…It should also be noted that no oxidation was observed in Al coatings, even for the highest process temperature ( Figure 4 a (Al_1.0)). The above observations, especially for Ti, are consistent with our previously published results [ 30 , 31 , 32 ]. The dense and uniform Al coatings are more suitable for better corrosion resistance, unlike the porous and oxidized Ti depositions.…”

Section: Resultssupporting

confidence: 93%

“…As described during the microstructure analysis, these changes are derivative of two independent phenomena occurring during coating deposition (i.e., strain hardening and thermal softening). The mutual contribution of these phenomena, being a derivative of the WS temperature, which is a function of the NFR parameter, determines the coating microstructure (i.e., porosity, oxidized area) and mechanical properties (e.g., hardness) [ 30 , 31 , 32 ].…”

Section: Resultsmentioning

confidence: 99%

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A Comparative Study of Aluminium and Titanium Warm Sprayed Coatings on AZ91E Magnesium Alloy

et al. 2022

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Aluminium (Al) and titanium (Ti) coatings were applied on AZ91E magnesium alloy using a low-pressure warm spray (WS) method. The deposition was completed using three different nitrogen flow rates (NFR) for both coatings. NFR effects on coating microstructure and other physical properties were systematically studied. Microstructural characterization was performed using scanning electron microscopy (SEM), and the porosity was estimated using two methods—image analysis and X-ray microtomography. The coating adhesion strength, wear resistance, and hardness were examined. The protective properties of the coatings were verified via a salt spray test. Decreasing NFR during coating deposition produced more dense and compact coatings. However, these conditions increased the oxidation of the powder. Al coatings showed lower hardness and wear resistance than Ti coatings, although they are more suitable for corrosion protection due to their low porosity and high compactness.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

A Comparative Study of Aluminium and Titanium Warm Sprayed Coatings on AZ91E Magnesium Alloy

et al. 2022

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“…Besides, a study by Molak et al [16] also reported good results after heat treating Ti-6Al-4V coatings deposited by warm spray thermal technique. They sprayed coatings at different pressures, from 1 to 4 MPa, and controlling the temperature of the propellant gas by diluting the combustion flame with nitrogen.…”

Section: Introductionmentioning

confidence: 94%

Improving the oscillating wear response of cold sprayed Ti-6Al-4V coatings through a heat treatment

Sirvent

Garrido

Sharp

et al. 2020

Surface and Coatings Technology

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Cold spray (CS) coating technique is being studied as a potential solution for repairing aircraft Ti-6Al-4V components. This work is focused on the restoration of damaged components due to wear induced by vibrations. It is known that Ti-6Al-4V CS deposition shows difficulties to obtain non-porous coatings due to the high strength of this material, that is detrimental for wear resistance. In this sense, performing a post-heat treatment leads to lower porosity CS Ti-6Al-4V coatings and improves their mechanical properties, and thus, a better tribological behaviour is also expected. Therefore, the objective of this study was to determine the effect of a post-heat treatment on the wear resistance of Ti-6Al-4V coatings deposited by the CS technique. Ti-6Al-4V CS coatings were used, which have been sprayed with nitrogen as process gas at a temperature of 1100 °C and a pressure of 50 bar. The coatings were subjected to a solution heat treatment followed by a precipitation heat treatment. Oscillating and unidirectional sliding wear experiments were conducted on the coatings at room temperature and at 450 °C. A pin on disc configuration was used with a bearing steel counterbody. The 2 results were compared to those obtained on the substrate (which represents the material to be repaired) and on the as-sprayed coating, which were derived from a previous work. The heat treated coating presented improved wear behaviour as compared to the substrate as well as to the as-sprayed coating, particularly during the high temperature tests. Wear at high temperature was dominated by material transference from the counterbody to the Ti-6Al-4V coating.

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“…In another investigation, Molak et al [44] studied the effects of post-spray heat treatment and spray parameters on mechanical properties and microstructure of warm-sprayed Ti-6Al-4V coatings on low carbon steel (JIS: SS 400). Results showed that spray parameters affect both the oxygen content and porosity of the coatings.…”

Section: Hvof Spray Coatingmentioning

confidence: 99%

Performance of thermal-sprayed coatings to combat hot corrosion of coal-fired boiler tube and effect of process parameters and post-coating heat treatment on coating performance: a review

Kumar

Handa

Chawla

et al. 2021

Surface Engineering

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High-temperature corrosion of coal-fired boiler parts such as water walls and superheated tubes poses a serious threat to the efficiency of the thermal power plant. To overcome this, numbers of corrosion control techniques are commonly employed. But, a dense and defectfree coating deposited by the thermal spray technique has shown promising result to combat hot corrosion. Although open or closed porosity in distinct thermal spray coatings can originate from distinct factors such as partial or totally un-molten particles, inadequate flow or fragmentation of the molten particle at impact, non-optimal spray angle and entrapped gas. But, this can still only be prevented by coating post-treatment. Hence, in this paper, authors have reviewed the performance of distinct coatings deposited by diverse thermal spray processes. Then, the effect of distinct process parameters and heat treatments on microstructure and mechanical properties of coatings is described. Finally, the best coatings are suggested to combat maximum hot corrosion of boiler tubes.

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Effects of Spray Parameters and Post-spray Heat Treatment on Microstructure and Mechanical Properties of Warm-Sprayed Ti-6Al-4V Coatings

Cited by 16 publications

References 33 publications

A Comparative Study of Aluminium and Titanium Warm Sprayed Coatings on AZ91E Magnesium Alloy

A Comparative Study of Aluminium and Titanium Warm Sprayed Coatings on AZ91E Magnesium Alloy

Improving the oscillating wear response of cold sprayed Ti-6Al-4V coatings through a heat treatment

Performance of thermal-sprayed coatings to combat hot corrosion of coal-fired boiler tube and effect of process parameters and post-coating heat treatment on coating performance: a review

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