Kinetic oxidation model including the transient regime for a single crystal nickel-based superalloy over the temperature range 750–1300 °C

Pérez, Thomas; Monceau, Daniel; Desgranges, Clara

doi:10.1016/j.corsci.2022.110485

Cited by 21 publications

(22 citation statements)

References 35 publications

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“…The sections of the γ phase and γ ′ phase are shown in Figure 8a,b, respectively, and the blue atoms in Figure 8b are Al atoms. Due to the deviation in lattice constants between the γ phase and the γ ′ phase, there are mismatched dislocations in the interface of the model, and the dislocation density is an important factor affecting the performance of Ni-based single crystal alloys [10][11][12][13][14][15]. The corresponding γ/γ ′ phase interfaces of the six models are shown in Figure 9, and the yellow atoms are Re atoms.…”

Section: Resultsmentioning

confidence: 99%

Research on the Effect Mechanism of Re on Interface Dislocation Networks of Ni–Based Single Crystal Alloys

Li,

Zhou

2024

Materials

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The effect of interface dislocation networks on the mechanical properties of new Ni–based single crystal alloys containing Rhenium (Re) is very large. Because the interface dislocations are microscopic in the nano–scale range, this has not been investigated, and it is very difficult to prepare new Ni–based single crystal alloys containing Re. Therefore, six kinds of new Ni–based single crystal alloys containing Re were prepared, and the hardness tests and nonlinear ultrasonic lamb wave tests were performed on the samples. It was found that the density of interface dislocation networks increases with the increase in the content of Re, which improves the blocking ability of matrix phase dislocation cutting into precipitated phase and enhances the inhibition of dislocation movement. The nonlinear ultrasonic lamb wave tests showed that the materials exhibit better mechanical properties when the density of the interface dislocation networks increases. Meanwhile, a new molecular dynamics model which is closer to the real state of an Ni–based single crystal alloy was constructed to reveal the evolution mechanism of interface dislocation networks. The results showed that the potential energy of Re atoms at the interface is the lowest, which affects the reduction of the potential energy of other atoms at the interface, and thus the stability of the model is improved. In addition, according to the change in the total length of dislocation loops in the model system, with the increase in the content of Re atoms, the inhibition of dislocation movement by dislocation networks at the interface is strengthened.

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Section: Resultsmentioning

confidence: 99%

Research on the Effect Mechanism of Re on Interface Dislocation Networks of Ni–Based Single Crystal Alloys

Li,

Zhou

2024

Materials

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“…PM2000 was provided by Plansee. Some chromia-forming HEA alloys under development were tested, they are named F, G and H. AM1 [9], R77, DS200-Hf alloys were supplied by Safran Aircraft Engines. AMS20 is an alumina forming superalloy under development, AMS20-S was desul rized by ONERA, CMSX-4 SLS, AMS19, GOL1, GOL2, AD730 and ST201 were provided by Safran Tech and alloys A, B, C, D and E are new alumina forming alloys under development.…”

Section: Methodsmentioning

confidence: 99%

“…Over the past years, a method has been tested where a piece of alloy is subjected to a succession of high temperature dwells. This has been done with several types of materials: pure Fe, pure Ni [6], Ti-alloys [7], chromia [8] and alumina [9] forming superalloys and high entropy alloys. This became achievable due to the method of calculating the parabolic constant following any transient oxidation regime [6].…”

Section: Introductionmentioning

confidence: 99%

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Stepwise Multi-Temperature Thermogravimetric Analysis (SMT-TGA) for Rapid Alloy Development

Monceau,

Enjalbert,

Desgranges

et al. 2024

Preprint

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The Stepwise Multi-Temperature Thermogravimetric Analysis (SMT-TGA) method is a rapid and time- and material-efficient measurement procedure for oxidation kinetics over a wide range of temperatures. It is suitable for alloy design and material selection procedures. It involves subjecting a sample to a series of steps at increasing temperatures, followed by steps at decreasing temperatures to identify possible effects on the evolution of oxide layer microstructures on oxidation kinetics. This method has been tested for a wide range of metallic alloys in the present work, allowing for the mapping of possible ranges of parabolic oxidation kinetics of industrial alloys between 600 and 1300°C. Two examples of effects of thermal history have also been described in this publication.

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“…However, this is becoming increasingly impractical given the complex compositions of the latest Ni-based superalloys. Computational methods [10,11] have been consequently used to predict the tendency of an alloy composition to preferentially form a protective oxide (e.g., Cr 2 O 3 or Al 2 O 3 ). Such models often make use of established physical relationships describing elemental interdiffusion and oxidation.…”

Section: Introductionmentioning

confidence: 99%

The Isothermal Oxidation of a New Polycrystalline Turbine Disk Ni-Based Superalloy at 800 °C and Its Modification with Pre-oxidation

Pang

Wilson

et al. 2022

Metall Mater Trans A

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Ni-based superalloys with enhanced oxidation resistance at high temperatures are crucial for next-generation gas turbine engines. A new polycrystalline Ni-based superalloy (C19) that combines improved microstructural stability with environmental resistance has been developed. Its oxidation resistance has been determined through measurements of the specific mass change and morphological evolution of the formed oxides following furnace exposures at 800 °C in air for up to 1000 hours; the results of which were benchmarked against Nimonic 105. C19 showed hybrid Type II/Type III behavior as a marginal Al2O3 former and performed similarly to established superalloys at 750 °C. The Wagner model for the transition from internal to external oxide formation predicted that C19 should form a continuous Al2O3 scale at higher temperatures. A pre-oxidation treatment at 1100 °C for 1 hour was, therefore, selected and shown to dramatically improve the oxidation resistance during subsequent exposure at 800 °C. Oxide cross-sectional analysis showed that C19 formed a continuous and protective Al2O3 scale after the pre-oxidation treatment, whereas Nimonic 105 retained discontinuous Al2O3 finger-like intrusions beneath a Cr2O3 overscale.

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Kinetic oxidation model including the transient regime for a single crystal nickel-based superalloy over the temperature range 750–1300 °C

Cited by 21 publications

References 35 publications

Research on the Effect Mechanism of Re on Interface Dislocation Networks of Ni–Based Single Crystal Alloys

Research on the Effect Mechanism of Re on Interface Dislocation Networks of Ni–Based Single Crystal Alloys

Stepwise Multi-Temperature Thermogravimetric Analysis (SMT-TGA) for Rapid Alloy Development

The Isothermal Oxidation of a New Polycrystalline Turbine Disk Ni-Based Superalloy at 800 °C and Its Modification with Pre-oxidation

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