Design of next generation Ni-base single crystal superalloys containing Ir: Towards 1150 °c temperature capability

T. Yokokawa, H. Harada, Y. Mori, K. Kawagishi, Y. Koizumi, T. Kobayashi, M. Yuyama, S. Suzuki

研究成果: Conference contribution

12 被引用数 (Scopus)

抄録

Ni-base single crystal (SC) superalloys with superior mechanical properties are being developed to improve thermal efficiency of jet engines and land-based gas turbines. The benefit of Ir addition to Ni-base SC superalloys and possibilities to design next generation Ni-base SC superalloys containing Ir were investigated in this study. Five equations that predict the tensile creep rupture life at test conditions of 800°C and 735 MPa, 900 °C and 392 MPa, 1000°C and 245 MPa, 1100°C and 137 MPa and 1150°C and 137 MPa were obtained for Ni-base SC alloys, including Ir containing compositions, with excellent multi-correlation coefficients that range from 0.95 to 0.98. From the regression coefficients of these prediction equations, we successfully clarified the predominating creep strengthening factors in middle - higher temperature and middle - lower stress creep test regions. Additions of Ir were not found to improve the creep strength of alloys, but were effective in suppressing the formation of topologically close packed (TCP) phases. The development of next-generation SC superalloys containing Ir with excellent creep strength was possible by using an updated alloy design program at the National Institute for Materials Science (NIMS). The developed alloy shows an improvement in temperature capability of 20°C in terms of creep rupture life over that of sixth-generation Ni-base SC superalloy TMS-238.

本文言語English
ホスト出版物のタイトルSUPERALLOYS 2016 - Proceedings of the 13th International Symposium on Superalloys
編集者Mark Hardy, Eric Huron, Uwe Glatzel, Brian Griffin, Beth Lewis, Cathie Rae, Venkat Seetharaman, Sammy Tin
出版社Minerals, Metals and Materials Society
ページ123-130
ページ数8
ISBN(電子版)9781118996669
DOI
出版ステータスPublished - 2016
イベント13th International Symposium on Superalloys, SUPERALLOYS 2016 - Seven Springs, United States
継続期間: 2016 9 112016 9 15

出版物シリーズ

名前Proceedings of the International Symposium on Superalloys
2016-January

Other

Other13th International Symposium on Superalloys, SUPERALLOYS 2016
国/地域United States
CitySeven Springs
Period16/9/1116/9/15

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学

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