Substrate Effect on the High-Temperature Oxidation Behavior of a Pt-Modified Aluminide Coating. Part I: Influence of the Initial Chemical Composition of the Coating Surface

Vialas, Nadia; Monceau, Daniel

doi:10.1007/s11085-006-9024-z

Cited by 48 publications

(42 citation statements)

References 38 publications

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“…part I [1]). At 1,050°C, the effect of the substrate on the long-term, cyclic-oxidation behavior becomes more important.…”

Section: Discussionmentioning

confidence: 99%

“…17 for RT22/IN792. They can be compared with the microstructures of as-coated specimens which were detailed in part I of this work [1].…”

Section: Microstructural Evolution Of the Coatingsmentioning

confidence: 99%

“…19 Volume change due to b to c 0 transformation detected from the first hours of oxidation on RT22/CMSX-4 and RT22/IN792 appeared to be detrimental to oxide scale adherence during short-term isothermal oxidation and long-term cyclic oxidation at 900°C (cf. Part I [1]). Nevertheless, during long-term, cyclic-oxidation tests at 1,050°C, this detrimental effect is small compared to the detrimental effect of voids.…”

Section: Oxide Scale Spallationmentioning

confidence: 99%

“…In part I of this study, short-term, isothermal-oxidation tests at 900, 1,050, and 1,150°C and long-term, cyclic-oxidation tests at 900°C were performed on RT22 coatings deposited on three different Ni-base superalloys (CMSX-4, SCB, and IN792) [1]. This first part was focused on the influence of the substrate on the composition and microstructure of the Pt-modified-aluminide coating.…”

Section: Introductionmentioning

confidence: 99%

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Substrate Effect on the High Temperature Oxidation Behavior of a Pt-modified Aluminide Coating. Part II: Long-term Cyclic-oxidation Tests at 1,050 °C

Vialas

Monceau

2007

Oxid Met

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This second part of a two-part study is devoted to the effect of the substrate on the long-term, cyclic-oxidation behavior at 1,050°C of RT22 industrial coating deposited on three Ni-base superalloys (CMSX-4, SCB, and IN792). Cyclicoxidation tests at 1,050°C were performed for up to 58 cycles of 300 h (i.e., 17,400 h of heating at 1,050°C). For such test conditions, interdiffusion between the coating and its substrate plays a larger role in the damage process of the system than during isothermal tests at 900, 1,050, and 1,150°C for 100 h and cyclicoxidation tests at 900°C which were reported in part I [N. Vialas and D. Monceau, Oxidation of Metals 66, 155 (2006)]. The results reported in the present paper show that interdiffusion has an important effect on long-term, cyclic-oxidation resistance, so that clear differences can be observed between different superalloys protected with the same aluminide coating. Net-mass-change (NMC) curves show the better cyclic-oxidation behavior of the RT22/IN792 system whereas uncoated CMSX-4 has the best cyclic-oxidation resistance among the three superalloys studied. The importance of the interactions between the superalloy substrate and its coating is then demonstrated. The effect of the substrate on cyclic-oxidation behavior is related to the extent of oxide scale spalling and to the evolution of microstructural features of the coatings tested. SEM examinations of coating surfaces and cross sections show that spalling on RT22/CMSX-4 and RT22/SCB was favored by the presence of deep voids localized at the coating/oxide interface. Some of these voids can act as nucleation sites for scale spallation. The formation of such interfacial voids was always observed when the b to c 0 transformation leads to the formation of a two-phase b/c 0 layer in contact with the alumina scale. On the contrary, no voids were observed in RT22/IN792, since this b to c 0 transformation occurs gradually by an inward transformation of b leading to the formation of a continuous layer of c 0 phase, parallel to the metal/scale interface.

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“…part I [1]). At 1,050°C, the effect of the substrate on the long-term, cyclic-oxidation behavior becomes more important.…”

Section: Discussionmentioning

confidence: 99%

“…17 for RT22/IN792. They can be compared with the microstructures of as-coated specimens which were detailed in part I of this work [1].…”

Section: Microstructural Evolution Of the Coatingsmentioning

confidence: 99%

Section: Oxide Scale Spallationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Substrate Effect on the High Temperature Oxidation Behavior of a Pt-modified Aluminide Coating. Part II: Long-term Cyclic-oxidation Tests at 1,050 °C

Vialas

Monceau

2007

Oxid Met

Self Cite

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“…Ni-base superalloys possessing superior strength and adequate resistant-oxidation properties have been developed for high-performance applications involving high stresses and temperatures generally above 900°C [1][2][3]. Alloying elements like Cr, W, Mo, Nb, Ti are added to improve the high-temperature properties without loss of their oxidation-resistant property with the purpose of meeting practical demands [4,5].…”

Section: Introductionmentioning

confidence: 99%

Oxidation Behavior of a Cast Polycrystalline Ni-Base Superalloy in Air: At 900 and 1000 °C

et al. 2007

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The oxidation behavior of a cast polycrystalline Ni-base superalloy was studied at 900 and 1000°C and analyzed by thermogravimetric analysis (TGA), X-ray diffraction (XRD) and SEM. The results indicate that the cast Ni-base superalloy exhibits subparabolic oxidation kinetics, which are controlled by the growth of the inner Al-rich layer. A mixed scale forms on the alloy after prolonged oxidation. The oxide scale formed on the c matrix is composed of an outer layer of spinel and a uniform inner, compact Al-rich layer. The oxidation behavior on the region overlying MC carbide precipitates is slightly different from that in the c matrix. The difference is explained by the big difference in composition between MC carbide and c matrix.

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Causal discovery to understand hot corrosion

Varghese,

Arana‐Catania,

Mori

et al. 2024

Materials & Corrosion

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Gas turbine superalloys experience hot corrosion, driven by factors including corrosive deposit flux, temperature, gas composition, and component material. The full mechanism still needs clarification and research often focuses on laboratory work. As such, there is interest in causal discovery to confirm the significance of factors and identify potential missing causal relationships or codependencies between these factors. The causal discovery algorithm fast causal inference (FCI) has been trialled on a small set of laboratory data, with the outputs evaluated for their significance to corrosion propagation, and compared to existing mechanistic understanding. FCI identified salt deposition flux as the most influential corrosion variable for this limited data set. However, HCl was the second most influential for pitting regions, compared to temperature for more uniformly corroding regions. Thus, FCI generated causal links aligned with literature from a randomised corrosion data set, while also identifying the presence of two different degradation modes in operation.

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Substrate Effect on the High-Temperature Oxidation Behavior of a Pt-Modified Aluminide Coating. Part I: Influence of the Initial Chemical Composition of the Coating Surface

Cited by 48 publications

References 38 publications

Substrate Effect on the High Temperature Oxidation Behavior of a Pt-modified Aluminide Coating. Part II: Long-term Cyclic-oxidation Tests at 1,050 °C

Substrate Effect on the High Temperature Oxidation Behavior of a Pt-modified Aluminide Coating. Part II: Long-term Cyclic-oxidation Tests at 1,050 °C

Oxidation Behavior of a Cast Polycrystalline Ni-Base Superalloy in Air: At 900 and 1000 °C

Causal discovery to understand hot corrosion

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