The isothermal-oxidation behavior of several nickel-base single-crystal superalloys with and without coatings

Göbel, M.; Rahmel, A.; Schütze, M.

doi:10.1007/bf00665614

Cited by 57 publications

(39 citation statements)

References 12 publications

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“…13 Han and Young 14 observed a complex internal-precipitation zone formed in a Ni-Cr-Al alloy after thermal cycling in air at 1100°C: Al 2 O 3 and Cr 2 O 3 beneath the surface, followed by Al 2 O 3 , then AlN, then AlN + Cr 2 N, and, finally, AlN alone in the deepest region. 4 In the present study, the distribution of internal Al 2 O 3 , AlN and TiN reflected the relative stabilities of the precipitates. 15 It is known that Al 2 O 3 is much more stable than AlN, hence, Al 2 O 3 formed preferentially beneath the alloy surface.…”

Section: Growth Mechanism Of Scalementioning

confidence: 96%

Oxidation Behavior of a Single-Crystal Ni-base Superalloy in Air at 900, 1000 and 1100°C

et al. 2006

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The isothermal-oxidation behavior of a single-crystal (SC) Ni-base superalloy was studied over the temperature range from 900 to 1100°C and analyzed by OM, TGA, XRD, EDX, SEM and EPMA. The alloy obeyed a subparabolic rate law during oxidation at 900 and 1000°C, whereas the alloy showed parabolic behavior at 1100°C exposure. The variations in the chemical composition due to segregation, which resulted from the solidification process, led to the formation of different kinds of oxide scale on the dendritic and interdendritic areas during oxidation at 900 and 1000°C, while the alloy exhibited relatively uniform oxidation at 1100°C. The growth mechanism of the scale is discussed.

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Section: Growth Mechanism Of Scalementioning

confidence: 96%

Oxidation Behavior of a Single-Crystal Ni-base Superalloy in Air at 900, 1000 and 1100°C

et al. 2006

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“…In both cases, internal fatal crack initiation is obtained but it is noticed that the pre-exposed specimen presents less cracks at the surface compared to the reference one. It seems that static oxidation (i.e., thermal pre-exposition at 1000°C during 100 hours) has formed a non-porous and adherent oxide layer of Al 2 O 3 [55,56] that is more difficult to crack. Oxide layer in the reference specimen is formed in the meantime of the VHCF solicitation.…”

Section: Impact Of Oxidation At R = àmentioning

confidence: 99%

Very High Cycle Fatigue of Ni-Based Single-Crystal Superalloys at High Temperature

Cervellon

Cormier

Mauget

et al. 2018

Metall Mater Trans A

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“…Fig. 2 summarizes literature data [10,[19][20][21][22][23] of the relationship between the energy U to form alumina and the parabolic oxidation rate. Oxidation rates were subdivided into three different groups, corresponding to the representative oxidation rate levels of Al 2 O 3 , Cr 2 O 3 or NiO formation, according to [24].…”

mentioning

confidence: 99%

“…3 to data available in literature (CMSX-4 [20], PWA-1484 [20], René N5 (interpolated) and SCA425+0.25Si [19] for 900ºC; CMSX-4 [22], DD32 [23], SCA425+ [19], UCSX-2 [21], René N5 (interpolated for 1000ºC). The parameters are listed in Table 1.…”

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confidence: 99%

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Modeling of the Influence of Oxidation on Thin-walled Specimens of Single Crystal Superalloys

Bensch¹,

Sato²,

Warnken³

et al. 2012

Superalloys 2012 (Twelfth International Symposium)

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The microstructural evolution of uncoated single crystal superalloys is modeled taking into account the interplay between oxide growth and substrate response. Experimental investigations demonstrate that γ' fraction of specimens with thicknesses less than 1 mm are strongly affected by oxidation. A model based on thermodynamic and kinetic data only, is presented calculating the growth kinetics of oxide scales and the resulting influence on microstructure evolution of the substrate. The model combines models for oxide growth and substrate response. Currently the main focus is on alumina (Al 2 O 3 ) scale growth as it is the most important oxide for long term behavior. A dynamic growth parameter is used to describe the growth rate of the alumina scale. The model predicts the distribution of the alloying elements as well as the evolution of the generated phases as functions of depth and oxidation time. The model has been applied to three different alloys: the strong alumina forming alloy René N5, the moderate alumina forming alloy M247LC SX and the weak alumina forming alloy SCA425+. Since the γ' fraction is one of the most relevant factors for high temperature creep properties, the present work concentrates on the calculation of the time and space dependent γ' precipitate profile, which is most important for thin wall specimens. The predictions have been verified with very good agreement at an oxidation temperature of 980°C with respect to alumina scale growth and γ' fraction distribution. Predicted and measured alumina scale growth and γ' fraction distribution for oxidation at 980°C are in very good agreement.

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The isothermal-oxidation behavior of several nickel-base single-crystal superalloys with and without coatings

Cited by 57 publications

References 12 publications

Oxidation Behavior of a Single-Crystal Ni-base Superalloy in Air at 900, 1000 and 1100°C

Oxidation Behavior of a Single-Crystal Ni-base Superalloy in Air at 900, 1000 and 1100°C

Very High Cycle Fatigue of Ni-Based Single-Crystal Superalloys at High Temperature

Modeling of the Influence of Oxidation on Thin-walled Specimens of Single Crystal Superalloys

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