The solidification microstructure and carbide formation behaviors in the cobalt-based superalloy ECY768

J. S. Lee, J. H. Lee, B. G. Choi, C. Y. Jo, Ungyu Paik, S. G. Gang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

Co-base superalloys have been applied in the stationary compoents of gas turbine owing to their excellent high temperaure properties. The stationary Co-base alloy components are generally manufactured by casting. Solidification behavior of me alloy is an important factor in the selection of casting parameters. In the present study, solidification microstructure and carbide formation behaviors were studied by directional solidification. Directional solidification experiments were carried out at the solidification rates of 0.5 ∼ 150μm/s with the Co-base superalloy ECY768. Between the dendrites just below the final freezing temperature, MC carbide and M23C6 carbide were found. It was identified that the script or blocky carbides were Ta or W-rich MC carbide, and the lamellar carbides were Cr-rich M 23C6 eutectic carbides. The solid/liquid interface morphology clearly showed that freezing of the Cr-rich eutectic carbide occurred just after the script type MC carbide.

Original languageEnglish
Title of host publicationEco-Materials Processing and Design VI - Proceedings of the 6th International Symposium on Eco-Materials Processing and Design, ISEPD-6
Pages374-377
Number of pages4
StatePublished - 2005 Dec 1
Event6th International Symposium on Eco-Materials Processing and Design, ISEPD-6 - Jinju, Korea, Republic of
Duration: 2005 Jan 162005 Jan 18

Publication series

NameMaterials Science Forum
Volume486-487
ISSN (Print)0255-5476

Other

Other6th International Symposium on Eco-Materials Processing and Design, ISEPD-6
CountryKorea, Republic of
CityJinju
Period05/01/1605/01/18

Fingerprint

heat resistant alloys
Cobalt
Superalloys
carbides
solidification
Carbides
Solidification
cobalt
microstructure
Microstructure
Freezing
eutectics
Eutectics
freezing
Casting
Dendrites (metallography)
gas turbines
liquid-solid interfaces
dendrites
Gas turbines

Keywords

  • Carbide
  • Co-base superalloy
  • Directional solidification
  • Solidification rate

Cite this

Lee, J. S., Lee, J. H., Choi, B. G., Jo, C. Y., Paik, U., & Gang, S. G. (2005). The solidification microstructure and carbide formation behaviors in the cobalt-based superalloy ECY768. In Eco-Materials Processing and Design VI - Proceedings of the 6th International Symposium on Eco-Materials Processing and Design, ISEPD-6 (pp. 374-377). (Materials Science Forum; Vol. 486-487).
Lee, J. S. ; Lee, J. H. ; Choi, B. G. ; Jo, C. Y. ; Paik, Ungyu ; Gang, S. G. / The solidification microstructure and carbide formation behaviors in the cobalt-based superalloy ECY768. Eco-Materials Processing and Design VI - Proceedings of the 6th International Symposium on Eco-Materials Processing and Design, ISEPD-6. 2005. pp. 374-377 (Materials Science Forum).
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abstract = "Co-base superalloys have been applied in the stationary compoents of gas turbine owing to their excellent high temperaure properties. The stationary Co-base alloy components are generally manufactured by casting. Solidification behavior of me alloy is an important factor in the selection of casting parameters. In the present study, solidification microstructure and carbide formation behaviors were studied by directional solidification. Directional solidification experiments were carried out at the solidification rates of 0.5 ∼ 150μm/s with the Co-base superalloy ECY768. Between the dendrites just below the final freezing temperature, MC carbide and M23C6 carbide were found. It was identified that the script or blocky carbides were Ta or W-rich MC carbide, and the lamellar carbides were Cr-rich M 23C6 eutectic carbides. The solid/liquid interface morphology clearly showed that freezing of the Cr-rich eutectic carbide occurred just after the script type MC carbide.",
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Lee, JS, Lee, JH, Choi, BG, Jo, CY, Paik, U & Gang, SG 2005, The solidification microstructure and carbide formation behaviors in the cobalt-based superalloy ECY768. in Eco-Materials Processing and Design VI - Proceedings of the 6th International Symposium on Eco-Materials Processing and Design, ISEPD-6. Materials Science Forum, vol. 486-487, pp. 374-377, 6th International Symposium on Eco-Materials Processing and Design, ISEPD-6, Jinju, Korea, Republic of, 05/01/16.

The solidification microstructure and carbide formation behaviors in the cobalt-based superalloy ECY768. / Lee, J. S.; Lee, J. H.; Choi, B. G.; Jo, C. Y.; Paik, Ungyu; Gang, S. G.

Eco-Materials Processing and Design VI - Proceedings of the 6th International Symposium on Eco-Materials Processing and Design, ISEPD-6. 2005. p. 374-377 (Materials Science Forum; Vol. 486-487).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AU - Gang, S. G.

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N2 - Co-base superalloys have been applied in the stationary compoents of gas turbine owing to their excellent high temperaure properties. The stationary Co-base alloy components are generally manufactured by casting. Solidification behavior of me alloy is an important factor in the selection of casting parameters. In the present study, solidification microstructure and carbide formation behaviors were studied by directional solidification. Directional solidification experiments were carried out at the solidification rates of 0.5 ∼ 150μm/s with the Co-base superalloy ECY768. Between the dendrites just below the final freezing temperature, MC carbide and M23C6 carbide were found. It was identified that the script or blocky carbides were Ta or W-rich MC carbide, and the lamellar carbides were Cr-rich M 23C6 eutectic carbides. The solid/liquid interface morphology clearly showed that freezing of the Cr-rich eutectic carbide occurred just after the script type MC carbide.

AB - Co-base superalloys have been applied in the stationary compoents of gas turbine owing to their excellent high temperaure properties. The stationary Co-base alloy components are generally manufactured by casting. Solidification behavior of me alloy is an important factor in the selection of casting parameters. In the present study, solidification microstructure and carbide formation behaviors were studied by directional solidification. Directional solidification experiments were carried out at the solidification rates of 0.5 ∼ 150μm/s with the Co-base superalloy ECY768. Between the dendrites just below the final freezing temperature, MC carbide and M23C6 carbide were found. It was identified that the script or blocky carbides were Ta or W-rich MC carbide, and the lamellar carbides were Cr-rich M 23C6 eutectic carbides. The solid/liquid interface morphology clearly showed that freezing of the Cr-rich eutectic carbide occurred just after the script type MC carbide.

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Lee JS, Lee JH, Choi BG, Jo CY, Paik U, Gang SG. The solidification microstructure and carbide formation behaviors in the cobalt-based superalloy ECY768. In Eco-Materials Processing and Design VI - Proceedings of the 6th International Symposium on Eco-Materials Processing and Design, ISEPD-6. 2005. p. 374-377. (Materials Science Forum).