Effect of Specimen Thickness on Microstructural Changes During Oxidation of the NiCrW Alloy 230 at 950–1050°C

Jalowicka, A.; Duan, R.; Huczkowski, P.; Chyrkin, A.; Grüner, D.; Pint, B. A.; Unocic, K. A.; Quadakkers, W. J.

doi:10.1007/s11837-015-1645-8

Title: Effect of Specimen Thickness on Microstructural Changes During Oxidation of the NiCrW Alloy 230 at 950–1050°C

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Abstract

An accurate procedure for predicting oxidation-induced damage and lifetime limits is crucial for the reliable operation of high-temperature metallic components in practical applications. In order to develop a predictive oxidation lifetime model for Ni–Cr alloys, specimens of wrought NiCrW alloy 230 with different thicknesses were cyclically oxidized in air at 950–1050°C for up to 3000 h. After prolonged exposure, two types of carbides as well as a Cr-rich nitride (π-phase) precipitated in the γ-Ni matrix. In the case of oxidation-induced loss of Cr from the alloy resulted in the formation of subscale zones, which were free of the Cr-rich carbide and nitride but also of the Ni-W rich M₆C. The width of the M₆C-free zone was smaller than that free of the Cr-rich precipitates. Thermodynamic and diffusion calculations of the observed time- and temperature-dependent Cr depletion processes identified that back diffusion of C occurred which resulted in an increased volume fraction of M₂₃C₆ in the specimen core. Moreover, with increasing time and temperature, the amount of π-phase in the specimen core increased. The subscale depletion of the initially present Cr-nitrides and the formation of Cr-nitrides in the specimen center is believed to be related to a mechanism which is qualitativelymore »« less

Authors:

Jalowicka, A. ^[1]; Duan, R. ^[1]; Huczkowski, P. ^[1]; Chyrkin, A. ^[1]; Grüner, D. ^[1]; Pint, B. A. ^[2]; Unocic, K. A. ^[2]; Quadakkers, W. J. ^[1]

Julich Research Centre (Germany)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:: Fri Sep 25 00:00:00 EDT 2015

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

OSTI Identifier:: 1265880

Grant/Contract Number:: AC05-00OR22725; 03EK3032

Resource Type:: Accepted Manuscript

Journal Name:: Journal of The Minerals, Metals & Materials Society

Additional Journal Information:: Journal Volume: 67; Journal Issue: 11; Journal ID: ISSN 1047-4838

Publisher:: Springer

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; NiCr alloys; oxidation; lifetime model; thermodynamics; kinetics

Citation Formats


                    Jalowicka, A., Duan, R., Huczkowski, P., Chyrkin, A., Grüner, D., Pint, B. A., Unocic, K. A., and Quadakkers, W. J. Effect of Specimen Thickness on Microstructural Changes During Oxidation of the NiCrW Alloy 230 at 950–1050°C.  United States: N. p., 2015. 
Web.  doi:10.1007/s11837-015-1645-8.

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                    Jalowicka, A., Duan, R., Huczkowski, P., Chyrkin, A., Grüner, D., Pint, B. A., Unocic, K. A., & Quadakkers, W. J. Effect of Specimen Thickness on Microstructural Changes During Oxidation of the NiCrW Alloy 230 at 950–1050°C.  United States.  https://doi.org/10.1007/s11837-015-1645-8

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                    Jalowicka, A., Duan, R., Huczkowski, P., Chyrkin, A., Grüner, D., Pint, B. A., Unocic, K. A., and Quadakkers, W. J. Fri .  
"Effect of Specimen Thickness on Microstructural Changes During Oxidation of the NiCrW Alloy 230 at 950–1050°C".  United States.  https://doi.org/10.1007/s11837-015-1645-8.  https://www.osti.gov/servlets/purl/1265880.

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@article{osti_1265880,

  title        = {Effect of Specimen Thickness on Microstructural Changes During Oxidation of the NiCrW Alloy 230 at 950–1050°C},

  author       = {Jalowicka, A. and Duan, R. and Huczkowski, P. and Chyrkin, A. and Grüner, D. and Pint, B. A. and Unocic, K. A. and Quadakkers, W. J.},

  abstractNote = {An accurate procedure for predicting oxidation-induced damage and lifetime limits is crucial for the reliable operation of high-temperature metallic components in practical applications. In order to develop a predictive oxidation lifetime model for Ni–Cr alloys, specimens of wrought NiCrW alloy 230 with different thicknesses were cyclically oxidized in air at 950–1050°C for up to 3000 h. After prolonged exposure, two types of carbides as well as a Cr-rich nitride (π-phase) precipitated in the γ-Ni matrix. In the case of oxidation-induced loss of Cr from the alloy resulted in the formation of subscale zones, which were free of the Cr-rich carbide and nitride but also of the Ni-W rich M6C. The width of the M6C-free zone was smaller than that free of the Cr-rich precipitates. Thermodynamic and diffusion calculations of the observed time- and temperature-dependent Cr depletion processes identified that back diffusion of C occurred which resulted in an increased volume fraction of M23C6 in the specimen core. Moreover, with increasing time and temperature, the amount of π-phase in the specimen core increased. The subscale depletion of the initially present Cr-nitrides and the formation of Cr-nitrides in the specimen center is believed to be related to a mechanism which is qualitatively similar to that described for the Cr carbide enrichment. However, with increasing time and decreasing specimen thickness, N uptake from the atmosphere becomes apparent. As a result, the precipitates present in the specimen center eventually consisted almost exclusively of nitrides.},

  doi          = {10.1007/s11837-015-1645-8},

  journal      = {Journal of The Minerals, Metals & Materials Society},

  number       = 11,

  volume       = 67,

  place        = {United States},

  year         = {Fri Sep 25 00:00:00 EDT 2015},

  month        = {Fri Sep 25 00:00:00 EDT 2015}

}

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