High-Temperature Oxidation Behavior of a Novel Co-Base Superalloy

Forsik, Stéphane A. J.; Rosas, Alberto O. Polar; Wang, Tao; Colombo, Gian; Zhou, Ning; Kernion, Samuel J.; Epler, Mario E.

doi:10.1007/s11661-018-4736-7

Cited by 37 publications

(18 citation statements)

References 29 publications

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“…The formation of spinels in inner oxide layers of comparable alloys was also experimentally observed and predicted by simulations. [2,3] FIB tomography was utilized to elucidate the pore distribution in the Cr-containing spinel layer of an Fe-Cr alloy after exposure to steam at 650 C. [48] The publication demonstrated a higher degree of interconnectivity compared with the present study. When comparing the standard nano-CT analysis with the SEM/EDXS-informed nano-CT reconstruction, it is noteworthy that the calibration down scales the porosity for all peaks consistently.…”

Section: Quantitative Analysis and Interpretation Of Microstructure Dmentioning

confidence: 62%

“…In particular, EDXS becomes important when different oxides phases coexist in the oxide scales which is the common scenario. [2,3,20,23,25,44] The large pore can already be identified from the shadow contrast in the SEM image. Accordingly, the EDXS mappings do not show Al (area marked by the red circle) and O in this area but only slight depletion of Co which might result from partial absorption of X-rays generated in the material below the pore on their path to the detector.…”

Section: Sem/edxs-informed Nano-ct Reconstructionmentioning

confidence: 99%

“…In recent years, the applicability of Co-base superalloys as high-temperature material has been a research topic of high interest. [1][2][3][4][5] This new class of superalloys was first reported by Lee [6] and rediscovered in 2006 by Sato et al [7] So far, the mechanical properties of Co-base alloys have been studied extensively [8][9][10][11][12][13] and they are deemed promising for applications in the intermediate-temperature regime. [14][15][16] Phase stability and high-temperature mechanical properties were significantly improved in the last years by addition of a wide range of alloying elements.…”

Section: Introductionmentioning

confidence: 99%

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Correlative Nano‐Computed Tomography and Focused Ion‐Beam Sectioning: A Case Study on a Co‐Base Superalloy Oxide Scale

et al. 2019

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Herein, the capabilities of a correlative tomography approach combining laboratory nano X‐ray computed tomography, focused ion‐beam sectioning, and energy‐dispersive X‐ray spectroscopy are utilized for the characterization of multilayered oxide scales of Co‐base superalloys regarding their 3D morphology and chemical composition. The combination of complementary 3D imaging techniques allows for a precise and reliable segmentation of the pore space, oxide precipitates, and different phases of the initial material. Such information is instrumental to a microscopic understanding of oxidation in this new class of superalloys and key to improvement of oxidation resistance in the next‐generation high‐temperature materials.

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Section: Quantitative Analysis and Interpretation Of Microstructure Dmentioning

confidence: 62%

Section: Sem/edxs-informed Nano-ct Reconstructionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Correlative Nano‐Computed Tomography and Focused Ion‐Beam Sectioning: A Case Study on a Co‐Base Superalloy Oxide Scale

et al. 2019

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“…It is widely used in a variety of components of gas turbines such as blades, seal rings, and disks working at about 700 • C [2][3][4][5]. Moreover, one of the reasons for the most common use of Waspaloy is its excellent isothermal oxidation resistance [6,7] as well as high relaxation limit at the temperature of 600 • C [8].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Hot Workability of Nickel-Based Superalloy Using Activation Energy Map and Processing Maps

et al. 2020

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The stress-strain curves for nickel-based superalloy were obtained from isothermal hot compression tests at a wide range of deformation temperatures and strain rates. The material constants and deformation activation energy of the investigated superalloy were calculated. The accuracy of the constitutive equation describing the hot deformation behavior of this material was confirmed by the correlation coefficient for the linear regression. The distribution of deformation activation energy Q as a function of strain rate and temperature for nickel-based superalloy was presented. The processing maps were generated upon the basis of Prasad stability criterion for true strains ranging from 0.2 to 1 at the deformation temperatures range of 900–1150 °C, and strain rates range of 0.01–100 s−1. Based on the flow stress curves analysis, deformation activation energy map, and processing maps for different true strains, the undesirable and potentially favorable hot deformation parameters were determined. The microstructural observations confirmed the above optimization results for the hot workability of the investigated superalloy. Besides, the numerical simulation and industrial forging tests were performed in order to verify the obtained results.

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“…THE recent report of a c¢-strengthened Co-Al-Wbased alloy opened up a practical possibility for developing new Co-based superalloys, which have become an increasingly active research area over the past decade. [1][2][3][4][5][6][7][8][9][10][11][12][13] After studying their potentials, it was found that the solvus temperature of c¢ precipitates can be increased up to 1200°C with high solidus temperature, [2][3][4][5] mechanical performance [6][7][8] and oxidation properties [9][10][11][12][13] as promising engineering materials candidate for high-temperature applications. However, their high density and limited microstructural stability remain the biggest challenges for their further development.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties Evolution of Co-Al-W-Ni-Cr Superalloys by Molybdenum and Niobium Substitutions for Tungsten

Zhang

Xue

et al. 2019

Metall Mater Trans A

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The microstructure and mechanical properties of Co-Al-W to Co-Al-Mo/Nb alloy systems have been investigated in an attempt to identify the influence of replacement for W in multicomponent Co-based alloys with 30 at. pct Ni and 12 at. pct Cr. Either Mo or Nb additions at the expense of W reduce alloy density to a similar extent. Increasing Mo substitution significantly decreases the c¢ volume fraction and results in spherical c¢ morphology at 750°C, whereas Nb substitution shows opposite effects on the c¢ volume fraction and morphology. Accordingly, the Mo and Nb additions raise and decrease the microhardness and high-temperature compression strength, respectively. The results can provide reference for the development of Co-based superalloys with low density and high strength.

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High-Temperature Oxidation Behavior of a Novel Co-Base Superalloy

Cited by 37 publications

References 29 publications

Correlative Nano‐Computed Tomography and Focused Ion‐Beam Sectioning: A Case Study on a Co‐Base Superalloy Oxide Scale

Correlative Nano‐Computed Tomography and Focused Ion‐Beam Sectioning: A Case Study on a Co‐Base Superalloy Oxide Scale

Evaluation of Hot Workability of Nickel-Based Superalloy Using Activation Energy Map and Processing Maps

Microstructure and Properties Evolution of Co-Al-W-Ni-Cr Superalloys by Molybdenum and Niobium Substitutions for Tungsten

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