The effects of heat treatment on the mechanical properties of cold-sprayed coatings

Huang, Renzhong; Sone, Michiyoshi; Ma, Wenhua; Fukanuma, Hirotaka

doi:10.1016/j.surfcoat.2014.11.017

Cited by 195 publications

(88 citation statements)

References 25 publications

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“…As previously reported, cold-sprayed coatings can be extremely dense and show a very low porosity under suitable spraying conditions, in which the particles experience intense plastic deformation 93 . However, under some spraying conditions and, depending on the starting material, the temperature of particles during the deposition process generates some residual tensile stresses due to thermal effects 94,95 .…”

Section: Some Relevant Corrosion Studies Of Cold Spray Coatings and Csupporting

confidence: 56%

“…An alternative to improve the performance of these coatings is the use of heat treatment as previously reported 63,66,75,78,81,84,93,96,97 . , stainless steel coatings 60,100 and Inconel 718 101 .…”

Section: Some Relevant Corrosion Studies Of Cold Spray Coatings and Cmentioning

confidence: 99%

“…Moreover, the mechanical properties (tensile strength, elongation) and corrosion resistance of cold-sprayed coatings may also be improved by applying heat treatments 60,94 . The evolution of cold-sprayed coatings microstructure during heat treatment was discussed in literature 93 . Two typical cold sprayed coatings, i.e., dense, and porous are shown in Figure 17.…”

Section: Some Relevant Corrosion Studies Of Cold Spray Coatings and Cmentioning

confidence: 99%

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Cold gas spray coatings: basic principles corrosion protection and applications

et al. 2017

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ABSTRACT:In this review, the beginnings and evolution of the cold gas spray (CGS) technique are described, followed by the main fundamental aspects of the technique together with a description of the several spraying systems up to date. Sequentially, the main spray parameters and their influence on the properties of the coatings are reported. Afterwards, the most important methodologies for preparing the feedstock powders to be sprayed, the effect of the powder composition, microstructure, particle size and shape on the properties of the coatings are discussed. The nature of the spray gun and nozzle, and the substrate pre-treatments were also discussed. With regard to microstructure and properties, the chemical and physical characterization of the coatings and the performance in protecting the substrates against corrosion together with some mechanical properties are presented and compared. The lacking systematic studies about the great part of investigated systems is the main drawback to compare the published results. Closing this review, the main applications, and the potentialities of the CGS coatings are evidenced.

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Section: Some Relevant Corrosion Studies Of Cold Spray Coatings and Csupporting

confidence: 56%

Section: Some Relevant Corrosion Studies Of Cold Spray Coatings and Cmentioning

confidence: 99%

Section: Some Relevant Corrosion Studies Of Cold Spray Coatings and Cmentioning

confidence: 99%

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Cold gas spray coatings: basic principles corrosion protection and applications

et al. 2017

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“…For instance, nanoindentation of cold-sprayed titanium has shown a correlation between grain size and hardness, following a Hall-Petch relationship [114]. Another important property of cold-spray deposits is the general lack of ductility due to severe deformation, though this can be improved by heat treatment [136][137][138]. Heat treatments can result in recovery and recrystallization of the material, and also increase the extension of bonded interfaces.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Cold spraying – A materials perspective

et al. 2016

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Cold spraying is a solid-state powder deposition process with several unique characteristics, allowing production of coatings or bulk components from a wide range of materials. The process has attracted much attention from academia and industry over the past two decades.The technical interest in cold spraying is twofold: first as a coating process for applications in surface technology, and second as a solid-state additive manufacturing process, offering an alternative to selective laser melting or electron beam melting methods. Moreover, cold spraying can be used to study materials behaviour under extremely high strain rates, high pressures and high cooling rates. The cold spraying process is thus considered to be relevant for various industrial applications, as well as for fundamental studies in materials science.This article aims to provide an overview of the cold spray process, the current understanding of the deposition mechanisms, and the related models and experiments, from a materials science perspective. IntroductionCold spraying (CS) is a solid-state material deposition technique, where micron-sized particles of a powder bond to a substrate as a result of high-velocity impact and the associated severe plastic deformation. Acceleration of particles to high velocities is obtained via expansion of a pressurised and (ironically) 'hot' gas through a diverging-converging nozzle.Despite heating the process gas -which is to provide higher acceleration of the gas and also to facilitate particle deformation through thermal softening -the feedstock remains in the solid state throughout the entire process; hence the name 'cold' spraying. This is to underline the contrast to conventional thermal spraying where particles are completely or partially molten upon impact onto the substrate. Alternative terminology includes cold gas spray, micro cold spray, cold gas dynamic spray, kinetic spray, supersonic particle deposition and metal powder application (MPA), all of which refer to the same principle of solid-state powder deposition as described above. CS is used for coating and repair. It is also used for additive manufacturing (AM) at relatively high deposition rates as compared to the methods based on selective laser or electron beam melting. The main advantage of CS is that it alleviates the problems associated with high temperature processing of materials, such as oxidation and unfavourable structural changes. It is possibly the only continuous method to produce bulk components of metastable materials that are available only in the powder form, e.g. as obtained from mechanical attrition or gas atomisation. The aim of the present paper is to provide an overview of CS from a materials perspective, particularly for a broader audience in materials research, e.g. with interest in dynamic phenomena, plasticity and phase transformations. In terms of application and properties, CS is perhaps best to be compared to thermal spraying processes, as in [24,25]. In view of relevant physical phenomena, however, CS is mos...

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“…The specific build-up mechanisms of cold spraying, which usually imparts a high degree of work hardening to the powder particles (Ref 5) and post-deposition residual stresses (Ref 6,7), can lead to low-ductility coatings. Post-deposition heat treatments have been shown to improve the properties (Ref 8,9,10,11).…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution in Solution Heat Treatment of Gas-Atomized Al Alloy (7075) Powder for Cold Spray

2017

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Cold gas dynamic spray is being explored as a repair technique for high-value metallic components, given its potential to produce pore and oxide-free deposits of between several micrometers and several millimeters thick with good levels of adhesion and mechanical strength. However, feedstock powders for cold spray experience rapid solidification if manufactured by gas atomization and hence can exhibit non-equilibrium microstructures and localized segregation of alloying elements. Here, we used sealed quartz tube solution heat treatment of a precipitation hardenable 7075 aluminum alloy feedstock to yield a consistent and homogeneous powder phase composition and microstructure prior to cold spraying, aiming for a more controllable heat treatment response of the cold spray deposits. It was shown that the dendritic microstructure and solute segregation in the gas-atomized powders were altered, such that the heat-treated powder exhibits a homogeneous distribution of solute atoms. Micro-indentation testing revealed that the heat-treated powder exhibited a mean hardness decrease of nearly 25% compared to the as-received powder. Deformation of the powder particles was enhanced by heat treatment, resulting in an improved coating with higher thickness (* 300 lm compared to * 40 lm for untreated feedstock). Improved particlesubstrate bonding was evidenced by formation of jets at the particle boundaries.

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The effects of heat treatment on the mechanical properties of cold-sprayed coatings

Cited by 195 publications

References 25 publications

Cold gas spray coatings: basic principles corrosion protection and applications

Cold gas spray coatings: basic principles corrosion protection and applications

Cold spraying – A materials perspective

Microstructural Evolution in Solution Heat Treatment of Gas-Atomized Al Alloy (7075) Powder for Cold Spray

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