Creep behavior of polycrystalline and single crystal Ni-based superalloys coated with Ta-containing NiCoCrAlY by high-velocity oxy-fuel spraying

Mora-García, Alma G.; Mosbacher, Mike; Hastreiter, Julia; Völkl, Rainer; Glatzel, Uwe; Muñoz-Saldaña, J.

doi:10.1016/j.scriptamat.2019.12.023

Cited by 17 publications

(4 citation statements)

References 13 publications

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“…As a result of the strength of the coating being far inferior to the matrix superalloy [22], cracks are more likely to form under different fracture stresses. In addition, due to the thickness debit effect [28], the creep response of the sheet specimens is sensitive to the changes in the microstructure during the coating preparation process. As a result, the stress rupture life of the coated superalloys significantly declines.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the Pt inhibits the diffusion of the refractory elements from the substrate to the coating, decreasing the number of TCP phases [31], which act as the heterogeneous cores of nucleation. The grains at the OZ/IDZ interface grow up gradually into coarse equiaxed crystals, decreasing the creep resistance of the IDZ [28]. As a result, some of the cracks in the 3 Pt coating expand into the IDZ.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Pt on Stress Rupture Properties of Pt-Modified Nickel Aluminide Coatings at 1100 °C

Xue,

Yin,

Deng

et al. 2024

Materials

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Platinum plays a crucial role in the superior high-temperature oxidation resistance of Pt-modified nickel aluminide (PtAl) coatings. However, PtAl coatings usually serve in thermo-mechanical coupling environments. To investigate whether Pt contributes to the high-temperature mechanical properties of PtAl coating, stress rupture tests under 1100 °C/100 MPa were performed on PtAl coatings with varying Pt contents. The different coatings were obtained by changing the thickness of the electroplated Pt layer, followed by a diffusion heat treatment and the aluminizing process in the present work. The results of the stress rupture tests indicated that an increasing Pt content resulted in a significant decrease in the stress rupture life of PtAl-coated superalloys under 1100 °C/100 MPa. Theoretical calculations and microstructural analysis suggested that an increased coating thickness due to the Pt content is not the main reason for this decline. It was found that the cracks generated close to the substrate in high-Pt-coated superalloys accelerated the fracture failure.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effect of Pt on Stress Rupture Properties of Pt-Modified Nickel Aluminide Coatings at 1100 °C

Xue,

Yin,

Deng

et al. 2024

Materials

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“…the creep lifetimes of DD6 increased with the decrease of the specimen thickness slightly. Most of the investigations focused on thin‐walled specimens machined from bulk materials 32–34 . Through the creep experiments of casting specimens and machined specimens of nickel‐based single crystal superalloy MAR M247LC, Körber et al 34 found that there were differences in thickness debit effect of MAR M247LC specimens prepared in different ways, and the microstructure difference (such as initial porosity) caused by different processing methods is an important reason for this phenomenon.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the investigations focused on thin-walled specimens machined from bulk materials. [32][33][34] Through the creep experiments of casting specimens and machined specimens of nickel-based single crystal superalloy MAR M247LC, Körber et al 34 found that there were differences in thickness debit effect of MAR M247LC specimens prepared in different ways, and the microstructure difference (such as initial porosity) caused by different processing methods is an important reason for this phenomenon. Texier et al 35 conducted high-temperature creep experiments with thin-wall specimens (50-200 μm), and the experimental results revealed heterogeneities in creep behavior at a mesoscopic scale, attributed to differences in creep strength between dendrite cores and interdendritic regions.…”

Section: Introductionmentioning

confidence: 99%

A thickness‐sensitive and orientation‐related creep lifetime prediction method of nickel‐based single crystal superalloy

Zhang

Wang

Liu

et al. 2023

Fatigue Fract Eng Mat Struct

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Considering the anisotropy of nickel‐based single crystal superalloy, an anisotropic creep lifetime prediction model based on slip plane damage is developed. The predicted results indicate that the lifetime prediction model could predict the creep lifetimes of nickel‐based single crystal superalloy with different orientations accurately. Furthermore, in order to reveal the damage mechanism of nickel‐based single crystal thin‐walled specimen, creep experiment and failure analysis of thin‐walled specimen are conducted, and there are obvious differences in damage mechanisms between surface and interior of the thin‐walled specimen. In this paper, both thickness debit effect and abnormal thickness debit effect are considered to be caused by the damage differences between surface and interior of the thin‐walled specimen, and zone‐based failure criteria considering thickness debit effect and abnormal thickness debit effect are proposed. Finally, combining the anisotropic creep lifetime prediction model and zone‐based failure criteria, the creep lifetime prediction of DD6 specimen with different thickness is conducted. The predicted lifetimes are within a scatter band of factor 2.26, and the predicted laws between creep lifetimes and thicknesses of the specimens are in good agreement with the experimental results, which verifies the rationality and accuracy of the thickness‐sensitive creep lifetime prediction method established in this paper.

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Effect of CrN Coating on Interfacial Creep Crack Initiation Behavior for Steel/Ni Dissimilar Metal Welded Joint

Wang

Shao

Huang

et al. 2022

Metall Mater Trans A

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Creep behavior of polycrystalline and single crystal Ni-based superalloys coated with Ta-containing NiCoCrAlY by high-velocity oxy-fuel spraying

Cited by 17 publications

References 13 publications

Effect of Pt on Stress Rupture Properties of Pt-Modified Nickel Aluminide Coatings at 1100 °C

Effect of Pt on Stress Rupture Properties of Pt-Modified Nickel Aluminide Coatings at 1100 °C

A thickness‐sensitive and orientation‐related creep lifetime prediction method of nickel‐based single crystal superalloy

Effect of CrN Coating on Interfacial Creep Crack Initiation Behavior for Steel/Ni Dissimilar Metal Welded Joint

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