Influence of Pre-Heated Al 6061 Substrate Temperature on the Residual Stresses of Multipass Al Coatings Deposited by Cold Spray

Rech, Silvano; Trentin, Andréa Gonçalves; Vezzù, Simone; Legoux, Jean-Gabriel; Irissou, Éric; Guagliano, Mario

doi:10.1007/s11666-010-9596-7

Cited by 62 publications

(20 citation statements)

References 21 publications

(8 reference statements)

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“…This is due to spraying gun heating by hot gas flowing through de Laval nozzle causing that the conditions in the nozzle varies. Additionally, for three initial passages, which last 40.8 s, for linear velocity of 10 mm/s, the substrate is gradually heated up due to gas and particles temperature, causing increase of coating thickness and, as proved in [26], heating up the substrate leads to higher process efficiency. Furthermore, despite the distance between successive spraying gun passages a = 3.7 mm, the beads overlap each other and when coating is sprayed in the next spraying gun passage, powder is deposited also on the previous bead.…”

Section: Resultsmentioning

confidence: 92%

Effect of Gas Pressure and Temperature on Stereometric Properties of Al+Al2O3 Composite Coatings Deposited by LPCS Method

Winnicki¹,

Piwowarczyk²,

Małachowska³

et al. 2014

Archives of Metallurgy and Materials

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The paper deals with effect of working gas pressure and temperature on surface stereometry of coatings deposited by low-pressure cold spray method. Examinations were focused on aluminium coatings which are commonly used to protect substrate against corrosion. A commercial Al spherical feedstock powder with admixture of Al 2 O 3 (Al + 60wt.-% Al 2 O 3 ), granulation -50+10 µm, was used to coat steel, grade S235JR. The deposited coatings were studied to determine their stereometry, i.e. roughness, transverse and longitudinal waviness, topography of surface and thickness as the functions of gas pressure and temperature. A profilometer and focal microscope were used to evaluate the stereometric properties. In order to reduce the number of variables, the remaining process parameters, i.e. shape and size of de Laval nozzle, nozzle-to-substrate distance, powder mass flow rate, linear velocity of spraying gun, were kept unchanged. The investigation confirmed influence of temperature and pressure on coating thickness as well as on the surface seterometry.Keywords: Cold Spray, metal-matrix composite, roughness, waviness W artykule przedstawiono wpływ ciśnienia i temperatury gazu roboczego na sterometrię powierzchni powłok nakładanych za pomocą niskociśnieniowej metody natryskiwania na zimno. Powłoki na podłożu stalowym S235JR zostały wykonane przy użyciu komercyjnie dostępnego proszku Al z dodatkiem Al 2 O 3 (20% Al/80% Al 2 O 3 wagowo) o granulacji <50 µm, zostały wykonane powłoki na podłożu stalowym S235JR. Następnie za pomocą profilometru i mikroskopu konfokalnego określono właściwości stereometryczne powłok takie jak chropowatość, falistość, topografię powierzchni oraz grubość w funkcji temperatury i ciśnienia gazu roboczego. W celu zminimalizowania ilości zmiennych pozostałe parametry procesu nie były zmieniane. Badania potwierdziły wpływ ciśnienia i temperatury gazu na stereometrię powierzchni.

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Section: Resultsmentioning

confidence: 92%

Effect of Gas Pressure and Temperature on Stereometric Properties of Al+Al2O3 Composite Coatings Deposited by LPCS Method

Winnicki¹,

Piwowarczyk²,

Małachowska³

et al. 2014

Archives of Metallurgy and Materials

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“…Thus, no particle melting is involved in the process [18,19] and the low temperature of the process enables to produce coatings with low residual stress [20], low porosity, and low oxygen content [21]. Cold spray deposition of ductile materials like aluminium and copper is widely reported in previous studies [22,23]. Harder and less ductile metallic materials like Ni, Ti (and their respectively alloys), and stainless steel can with some difficulties also be cold sprayed to M A N U S C R I P T…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Cold-spray deposition of Ti2AlC coatings

Rech

Surpi

Vezzù

et al. 2013

Vacuum

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Ti2AlC coatings have been fabricated by cold-spray deposition. The microstructure evolution as a function of basic spray parameters temperature and pressure onto AA6060 aluminium alloy and 1.0037 steel substrates has been studied. Adherent and dense 50–80 μm thick Ti2AlC coatings were deposited on soft AA6060 substrates under gas temperature and pressure of 600 °C and 3.4 MPa, respectively, whilst comparable results were obtained on harder 1.0037 steel by using higher temperature (800 °C) and pressure (3.9 MPa)

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“…Cold-Spray Bond Coats Much less work has been devoted to RS profiles in cold-spray coatings (Ref 24,25). Residual stresses within the coating are mainly induced by a peening effect with severe plastic deformation (cold work microstructure) of particles.…”

Section: Residual Stress Analysis By the Hole-drilling Methodsmentioning

confidence: 99%

Residual Stress Analysis of Laser-Drilled Thermal Barrier Coatings Involving Various Bond Coats

et al. 2014

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International audienceThe gas turbine combustion chamber of aero-engines requires a thermal barrier coating (TBC) by thermal spraying. Further heat protection is achieved by laser drilling of cooling holes. The residual stresses play an important role in the mechanical behaviour of TBC. It could also affect the TBC response to delamination during laser drilling. In this work, studies of the cracking behaviour after laser drilling and residual stress distribution have been achieved for different bond coats by plasma spray or cold spray. From interface crack length measured pulse-by-pulse after laser percussion drilling at 20° angle, the role of the various bond coats on crack initiation and propagation are investigated. It is shown that the bond coat drastically influences the cracking behaviour. The residual stresses profiles were also determined by the incremental hole-drilling method involving speckle interferometry. An original method was also developed to measure the residual stress profiles around a pre-drilled zone with a laser beam at 90°. The results are discussed to highlight the influence of TBCs interfaces on the resulting residual stresses distribution before laser drilling, and also to investigate the modification around the hole after laser drilling. It is shown that laser drilling could affect the residual stress state

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Influence of Pre-Heated Al 6061 Substrate Temperature on the Residual Stresses of Multipass Al Coatings Deposited by Cold Spray

Cited by 62 publications

References 21 publications

Effect of Gas Pressure and Temperature on Stereometric Properties of Al+Al2O3 Composite Coatings Deposited by LPCS Method

Effect of Gas Pressure and Temperature on Stereometric Properties of Al+Al2O3 Composite Coatings Deposited by LPCS Method

Cold-spray deposition of Ti2AlC coatings

Residual Stress Analysis of Laser-Drilled Thermal Barrier Coatings Involving Various Bond Coats

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