Analysis of Thermal History and Residual Stress in Cold-Sprayed Coatings

Arabgol, Z.; Assadi, H.; Schmidt, Tobias; Gärtner, F.; Klassen, Thomas

doi:10.1007/s11666-013-9976-x

Cited by 65 publications

(22 citation statements)

References 21 publications

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“…Thus, the residual stress can be influenced by the heat input, spraying kinematics and the associated thermal history. Based on these factors, in addition to substrate and coating material properties and dimensions, the mean residual stress in the coating can be compressive or tensile [149,150].…”

Section: Residual Stressmentioning

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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Section: Residual Stressmentioning

confidence: 99%

Cold spraying – A materials perspective

et al. 2016

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“…Indeed, microwelding effect due to the high kinetic energy and the corresponding severe plastic deformation, mainly on the periphery of the particles, lead to thermo-mechanical mechanisms of bonding which in turn define the deposits properties and also the residual stress intensity. Thus, the heat input and the associated thermal history have a major influence on the final distortion and the residual stress [25]. The type of material and the geometry have also a significant effect on the sign and magnitude of distortion, and so on the residual stresses in cold spraying.…”

Section: Residual Stressesmentioning

confidence: 99%

Mechanical properties of thick 304L stainless steel deposits processed by He cold spray

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Coddet

et al. 2015

Surface and Coatings Technology

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“…However, the temperature history of particles during deposition processing generates some residual tensile stress due to thermal effects [15,16]. Moreover, the severe impact deformation generates some residual compressive stress due to the kinetic effects [16][17][18][19]. The intensive plastic deformation of particles also decreases the ductility of coldsprayed coatings due to work hardening effects.…”

Section: Introductionmentioning

confidence: 99%