A comparison of the high-temperature oxidation behaviour of conventional wrought and laser beam melted Inconel 625

Ramenatte, Nicolas; Vernouillet, Annabelle; Mathieu, Sandrine; Put, Aurélie Vande; Vilasi, Michel; Monceau, Daniel

doi:10.1016/j.corsci.2019.108347

Cited by 59 publications

(32 citation statements)

References 32 publications

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“…The parabolic behavior of the oxidation kinetics was confirmed for both materials in the test time interval of 48 h, as 3 and plotted in an Arrhenius diagram (Fig. 7) with other constants found in the literature for the sake of comparison for bulk materials (different allotropic configurations of Al 2 O 3 [22], Cr 2 O 3 [49], NiO [50], Alloy 625 [5,[9][10][11][12], and NiCrAlY alloys [22][23][24]51,52]). Colored domains in Figs.…”

Section: Oxidation Behavior: Mass Gain Evolutionsupporting

confidence: 63%

“…Sparsely distributed NiO oxides and Cr-rich spinels were also observed. In addition, the Crdepletion beneath the oxide scale promoted the formation of a δ-Ni 3 Nb layer beneath the Cr 2 O 3 scale, as reported by Chyrkin et al and Ramenatte et al [10,11].…”

Section: Oxidation Behavior: Oxidation Productsmentioning

confidence: 54%

“…Its good resistance to high temperature surface reactivity derives from the considerable amount of chromium present in the alloy, i.e. about 20% in weight and 24 atomic %, promoting the formation of a continuous and protective external Cr 2 O 3 oxide layer and internal Al 2 O 3 oxides in a large temperature window [5,[9][10][11][12]. Alloy 625 exhibits a parabolic oxidation behavior between 600°C and 1050°C [9].…”

Section: Introductionmentioning

confidence: 99%

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High temperature oxidation of NiCrAlY coated Alloy 625 manufactured by selective laser melting

Texier

Copin

Flores

et al. 2020

Surface and Coatings Technology

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The high temperature oxidation of fully SLM-processed NiCrAlY coated Alloy 625 parts was investigated between 800°C and 1000°C. For comparison, bulk NiCrAlY and bulk Alloy 625 were also fabricated using SLM. Two thin layers of NiCrAlY powder were lasered at the surface of Alloy 625 to form the bi-materials. Bulk NiCrAlY and bi-materials showed an improved oxidation behavior compared to Alloy 625. The oxidation of the NiCrAlY coating results in regions with a dense and continuous external Al 2 O 3 layer and regions composed of a mixture of external Cr 2 O 3 and internal Al 2 O 3 . Large EDS maps at the surface and cross-sections of the bi-material highlighted a heterogeneous distribution of constitutive elements of the NiCrAlY coating, resulting in some regions with an Al activity lower than the one required for the formation of a continuous and dense Al 2 O 3 layer (≤10 atomic percent). Low Al activity and high Al activity regions were related to the topography of the SLMed surface and correspond to hill and valley regions, respectively. In addition, cracks, mainly occurring in high Al activity regions, were observed across NiCrAlY specimens. The fabrication of coated but small components with a brittle coating by SLM is not trivial and needs further investigations.

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Section: Oxidation Behavior: Mass Gain Evolutionsupporting

confidence: 63%

Section: Oxidation Behavior: Oxidation Productsmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High temperature oxidation of NiCrAlY coated Alloy 625 manufactured by selective laser melting

Texier

Copin

Flores

et al. 2020

Surface and Coatings Technology

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“…The interdendritic distance is indicative of the very high cooling rate associated to the high laser scan rate employed (∼90 cm/s). Its detailed microstructure is described elsewhere 49 . For the present investigation, the sample was thinned to 500 µm.…”

Section: Resultsmentioning

confidence: 99%

Evaluation and application of a new scintillator‐based heat‐resistant back‐scattered electron detector during heat treatment in the scanning electron microscope

Podor

Mendonça

Lautru

et al. 2020

Journal of Microscopy

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A new high‐temperature detector dedicated to the collection of backscattered electrons is used in combination with heating stages up to 1050°C, in high‐vacuum and low‐vacuum modes in order to evaluate its possibilities through signal‐to‐noise ration measurements and different applications. Four examples of material transformations occurring at high temperature are herein reported: grain growth during annealing of a rolled platinum foil, recrystallisation of a multiphased alloy, oxidation of a Ni‐based alloy and complex phase transformations occurring during the annealing of an Al‐Si coated boron steel. The detector could be potentially adapted to any type of SEM and it offers good opportunities to perform high‐temperature experiments in various atmospheres.

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“…[ 29 ] Currently, the most widely used heat sources for arc AM are as follows: gas tungsten arc‐based welding (GTAW), gas metal‐based arc welding (GMAW), plasma arc‐based welding (PAW), and cold metal transfer (CMT). [ 17 ] Nowadays, WAAM technology is widely used in aluminum alloy, [ 8,30–34 ] Ti6Al4V, [ 35–38 ] stainless steel, [ 26,39–41 ] and nickel base alloy. [ 3,4,7,9,42–47 ] Such as Zhang et al [ 8 ] studied the evolution of microstructure structure and mechanical properties of Al–6Mg alloy in the manufacture using variable polarity CMT arc as a power source.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Thick‐Walled Inconel 625 Alloy Manufactured by Wire Arc Additive Manufacture with Different Torch Paths

Jiang

Zhang

et al. 2020

Adv Eng Mater

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Wire arc additive manufacture (WAAM) technology has attracted more and more attention. WAAM technology provides a way to manufacture a large‐scale part at a low cost and with less material loss. Inconel 625 alloys are widely used for their excellent mechanical properties and corrosion resistance. Therefore, it is important to investigate the performance of Inconel 625 alloy in WAAM. Herein, cold metal transfer (CMT) arc is used as the heat source to fabricate thick‐walled parts of Inconel 625 alloy by WAAM, and study the difference between microstructure and mechanical properties under the different torch trajectories. The result shows that the grains inside the parts are all thick dendrites and show the trend of epitaxial growth. The thermal input of the oscillation additive is higher than the two‐pass multilayer additives, and the Laves phase also precipitated more. The maximum tensile strength occurs in parallel sampling close to the substrate, which is 693.5 ± 12.6 and 751.2 ± 17.6 MPa in oscillation and two‐pass multilayer modes, respectively. The maximum elongation is obtained in the vertical direction is 60 ± 1.0% and 60 ± 1.1%. The anisotropies are 4% and 4.5%, respectively. The maximum hardness value under the two torch trajectories also appears close to the substrate.

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A comparison of the high-temperature oxidation behaviour of conventional wrought and laser beam melted Inconel 625

Cited by 59 publications

References 32 publications

High temperature oxidation of NiCrAlY coated Alloy 625 manufactured by selective laser melting

High temperature oxidation of NiCrAlY coated Alloy 625 manufactured by selective laser melting

Evaluation and application of a new scintillator‐based heat‐resistant back‐scattered electron detector during heat treatment in the scanning electron microscope

Microstructure and Mechanical Properties of Thick‐Walled Inconel 625 Alloy Manufactured by Wire Arc Additive Manufacture with Different Torch Paths

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