3 Ton Melting with CaO Desulfurization of Ni-Base Single Crystal Superalloy TMS-1700, Simulating a Recycling of Used Turbine Blades

Tadaharu Yokokawa, Hiroshi Harada, Kyoko Kawagishi, Masao Sakamoto, Makoto Osawa, Yuji Takata, Michinari Yuyama, Toshiharu Kobayashi, Takuya Sugiyama, Shinsuke Suzuki

研究成果: Conference contribution

抄録

In order to investigate the applicability of a direct and complete recycling method to commercial-scale ingot production, 3 tons of a Ni-base single crystal (SC) superalloy, TMS-1700(MGA1700) was melted and desulfurized by CaO during the melting. Sulfur content in the molten alloy was reduced from about 23 ppm to about 2 ppm within 60 min after adding granular CaO to the molten alloy. Microstructural observations using SEM and EPMA showed no presence of inclusions caused by CaO addition. Creep rupture lives of the recycle-simulated TMS-1700 were equivalent to that of the standard TMS-1700 under the conditions from 800 °C/735 MPa to 1100 °C/137 MPa. The recycle-simulated TMS-1700 exhibits even better oxidation resistance compared with the standard TMS-1700, which has better oxidation resistance than CMSX-4TM. Thus, it became clear that the CaO desulfurization improves the oxidation resistance of Ni-base superalloys. High cycle fatigue (HCF) properties of the standard and the recycle-simulated TMS-1700 were equivalent. From the results described above, it has been suggested that the application of direct and complete recycling method to commercial-scale ingot production is feasible.

本文言語English
ホスト出版物のタイトルSuperalloys 2020 - Proceedings of the 14th International Symposium on Superalloys
編集者Sammy Tin, Mark Hardy, Justin Clews, Jonathan Cormier, Qiang Feng, John Marcin, Chris O'Brien, Akane Suzuki
出版社Springer Science and Business Media Deutschland GmbH
ページ400-407
ページ数8
ISBN(印刷版)9783030518332
DOI
出版ステータスPublished - 2020
イベント14th International Symposium on Superalloys, Superalloys 2021 - Seven Springs, United States
継続期間: 2021 9 122021 9 16

出版物シリーズ

名前Minerals, Metals and Materials Series
ISSN(印刷版)2367-1181
ISSN(電子版)2367-1696

Conference

Conference14th International Symposium on Superalloys, Superalloys 2021
国/地域United States
CitySeven Springs
Period21/9/1221/9/16

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー工学および電力技術
  • 材料力学
  • 金属および合金
  • 材料化学

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