Corrosion and carburization behaviour of ni-cr-mo-nb superalloys in a high temperature supercritical-CO2 environment

Sung Hwan Kim; Chaewon Kim; Gokul Obulan Subramanian; Changheui Jang

doi:10.1007/978-3-319-89480-5_10

Corrosion and carburization behaviour of ni-cr-mo-nb superalloys in a high temperature supercritical-CO₂ environment

Sung Hwan Kim, Chaewon Kim, Gokul Obulan Subramanian, Changheui Jang^*

^*Corresponding author for this work

Metallurgy and Materials

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Citations (Scopus)

Abstract

Two Ni-Cr-Mo-Nb superalloys (Alloy 625 and Alloy 718) were corroded in high temperature supercritical-CO₂(S-CO₂) at 700 ℃ (20 MPa) for 500 h and compared in terms of oxidation and carburization behavior. A continuous chromia (Cr₂O₃) layer was formed on the surface of Alloy 625, whereas Ni- and Fe-rich oxide nodules were also formed with chromia on Alloy 718. Meanwhile, the extent of carburization by formation of an amorphous C layer at the oxide/matrix interface was comparatively low for Alloy 625. This difference did not seem to stem from oxide type or underlying microstructure, and was thought to be associated with oxide properties. In terms of mechanical properties, only Alloy 625 exhibited decrease in ductility after exposure to S-CO₂. This was ascribed to the microstructural evolution of the alloys during the high temperature exposure.

Original language	English
Title of host publication	Proceedings of the 9th International Symposium on Superalloy 718 and Derivatives
Subtitle of host publication	Energy, Aerospace, and Industrial Applications
Editors	Karl Heck, Chantal Sudbrack, Max Kaplan, Jon Groh, Ian Dempster, Kevin Bockenstedt, Xingbo Liu, Zhongnan Bi, Daisuke Nagahama, Paul Jablonski, Eric Ott, Joel Andersson
Publisher	Springer
Pages	179-192
Number of pages	14
ISBN (Electronic)	9783319894799
DOIs	https://doi.org/10.1007/978-3-319-89480-5_10
Publication status	Published - 2018
Event	9th International Symposium on Superalloy 718 and Derivatives: Energy, Aerospace, and Industrial Applications - Pittsburgh, United States Duration: 3 Jun 2018 → 6 Jun 2018

Publication series

Name	Minerals, Metals and Materials Series
Volume	2018-June
ISSN (Print)	2367-1181
ISSN (Electronic)	2367-1696

Conference

Conference	9th International Symposium on Superalloy 718 and Derivatives: Energy, Aerospace, and Industrial Applications
Country/Territory	United States
City	Pittsburgh
Period	3/06/18 → 6/06/18

Bibliographical note

Publisher Copyright:
© The Minerals, Metals & Materials Society 2018.

Keywords

Aging
Carburization
High temperature corrosion
Ni-Cr-Mo-Nb superalloys
Supercritical-CO

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Energy Engineering and Power Technology
Mechanics of Materials
Metals and Alloys
Materials Chemistry

Access to Document

10.1007/978-3-319-89480-5_10

Cite this

Kim, S. H., Kim, C., Subramanian, G. O., & Jang, C. (2018). Corrosion and carburization behaviour of ni-cr-mo-nb superalloys in a high temperature supercritical-CO₂ environment. In K. Heck, C. Sudbrack, M. Kaplan, J. Groh, I. Dempster, K. Bockenstedt, X. Liu, Z. Bi, D. Nagahama, P. Jablonski, E. Ott, & J. Andersson (Eds.), Proceedings of the 9th International Symposium on Superalloy 718 and Derivatives: Energy, Aerospace, and Industrial Applications (pp. 179-192). (Minerals, Metals and Materials Series; Vol. 2018-June). Springer. https://doi.org/10.1007/978-3-319-89480-5_10

Kim, Sung Hwan ; Kim, Chaewon ; Subramanian, Gokul Obulan et al. / Corrosion and carburization behaviour of ni-cr-mo-nb superalloys in a high temperature supercritical-CO₂ environment. Proceedings of the 9th International Symposium on Superalloy 718 and Derivatives: Energy, Aerospace, and Industrial Applications. editor / Karl Heck ; Chantal Sudbrack ; Max Kaplan ; Jon Groh ; Ian Dempster ; Kevin Bockenstedt ; Xingbo Liu ; Zhongnan Bi ; Daisuke Nagahama ; Paul Jablonski ; Eric Ott ; Joel Andersson. Springer, 2018. pp. 179-192 (Minerals, Metals and Materials Series).

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title = "Corrosion and carburization behaviour of ni-cr-mo-nb superalloys in a high temperature supercritical-CO2 environment",

abstract = "Two Ni-Cr-Mo-Nb superalloys (Alloy 625 and Alloy 718) were corroded in high temperature supercritical-CO2(S-CO2) at 700 ℃ (20 MPa) for 500 h and compared in terms of oxidation and carburization behavior. A continuous chromia (Cr2O3) layer was formed on the surface of Alloy 625, whereas Ni- and Fe-rich oxide nodules were also formed with chromia on Alloy 718. Meanwhile, the extent of carburization by formation of an amorphous C layer at the oxide/matrix interface was comparatively low for Alloy 625. This difference did not seem to stem from oxide type or underlying microstructure, and was thought to be associated with oxide properties. In terms of mechanical properties, only Alloy 625 exhibited decrease in ductility after exposure to S-CO2. This was ascribed to the microstructural evolution of the alloys during the high temperature exposure.",

keywords = "Aging, Carburization, High temperature corrosion, Ni-Cr-Mo-Nb superalloys, Supercritical-CO",

author = "Kim, {Sung Hwan} and Chaewon Kim and Subramanian, {Gokul Obulan} and Changheui Jang",

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Kim, SH, Kim, C, Subramanian, GO & Jang, C 2018, Corrosion and carburization behaviour of ni-cr-mo-nb superalloys in a high temperature supercritical-CO₂ environment. in K Heck, C Sudbrack, M Kaplan, J Groh, I Dempster, K Bockenstedt, X Liu, Z Bi, D Nagahama, P Jablonski, E Ott & J Andersson (eds), Proceedings of the 9th International Symposium on Superalloy 718 and Derivatives: Energy, Aerospace, and Industrial Applications. Minerals, Metals and Materials Series, vol. 2018-June, Springer, pp. 179-192, 9th International Symposium on Superalloy 718 and Derivatives: Energy, Aerospace, and Industrial Applications, Pittsburgh, United States, 3/06/18. https://doi.org/10.1007/978-3-319-89480-5_10

Corrosion and carburization behaviour of ni-cr-mo-nb superalloys in a high temperature supercritical-CO₂ environment. / Kim, Sung Hwan; Kim, Chaewon; Subramanian, Gokul Obulan et al.
Proceedings of the 9th International Symposium on Superalloy 718 and Derivatives: Energy, Aerospace, and Industrial Applications. ed. / Karl Heck; Chantal Sudbrack; Max Kaplan; Jon Groh; Ian Dempster; Kevin Bockenstedt; Xingbo Liu; Zhongnan Bi; Daisuke Nagahama; Paul Jablonski; Eric Ott; Joel Andersson. Springer, 2018. p. 179-192 (Minerals, Metals and Materials Series; Vol. 2018-June).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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AU - Kim, Sung Hwan

AU - Kim, Chaewon

AU - Subramanian, Gokul Obulan

AU - Jang, Changheui

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AB - Two Ni-Cr-Mo-Nb superalloys (Alloy 625 and Alloy 718) were corroded in high temperature supercritical-CO2(S-CO2) at 700 ℃ (20 MPa) for 500 h and compared in terms of oxidation and carburization behavior. A continuous chromia (Cr2O3) layer was formed on the surface of Alloy 625, whereas Ni- and Fe-rich oxide nodules were also formed with chromia on Alloy 718. Meanwhile, the extent of carburization by formation of an amorphous C layer at the oxide/matrix interface was comparatively low for Alloy 625. This difference did not seem to stem from oxide type or underlying microstructure, and was thought to be associated with oxide properties. In terms of mechanical properties, only Alloy 625 exhibited decrease in ductility after exposure to S-CO2. This was ascribed to the microstructural evolution of the alloys during the high temperature exposure.

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Kim SH, Kim C, Subramanian GO, Jang C. Corrosion and carburization behaviour of ni-cr-mo-nb superalloys in a high temperature supercritical-CO₂ environment. In Heck K, Sudbrack C, Kaplan M, Groh J, Dempster I, Bockenstedt K, Liu X, Bi Z, Nagahama D, Jablonski P, Ott E, Andersson J, editors, Proceedings of the 9th International Symposium on Superalloy 718 and Derivatives: Energy, Aerospace, and Industrial Applications. Springer. 2018. p. 179-192. (Minerals, Metals and Materials Series). doi: 10.1007/978-3-319-89480-5_10