Séminaires > Design of high-end Ni-base single crystal superalloy for turbine blade applications
Date : 12 Mai à 14h
Lieu : Salle Barthélémy
Résumé :
Ni-base single crystal superalloys for turbine blade application are key material for thermal efficiency of gas turbine systems. NIMS has been working on the new superalloy development since 1980s, and continuing efforts have achieved the development of sixth generation single crystal superalloy TMS-238 with superior creep properties [1,2]. The key factor determining high-temperature creep performance of TMS-238 is the combination of solid-solution strengthening by Re addition, γ/γ′ interfacial strengthening by large lattice misfit, and γ/γ′ phase stabilization by Ru addition. Recent development has shown the potential for further improvement by addition of Ir as an alloying element, achieving world’s best creep life of over 4000 h at 1100 ℃ and 137 MPa condition [3]. Effect of Ir addition on the high temperature properties of the material will be discussed in the presentation.
[1] H. Harada, M. Yamazaki, Y. Koizumi, N. Sakuma, N. Furuya, H. Kamiya, Alloy Design for Nickel-Base Superalloys BT - High Temperature Alloys for Gas Turbines 1982, in : R. Brunetaud, D. Coutsouradis, T.B. Gibbons, Y. Lindblom, D.B. Meadowcroft, R. Stickler (Eds.), Springer Netherlands, Dordrecht, 1982 : pp. 721–735.
[2] K. Kawagishi, A. Yeh, T. Yokokawa, T. Kobayashi, Y. Koizumi, H. Harada, Development of an Oxidation-resistant High-Strength Sixth-Generation Single-Crystal Superalloy TMS-238, in : Superalloys 2012, 2012 : pp. 189–195. https://doi.org/10.1002/9781118516430.ch21.
[3] S. Utada, T. Yokokawa, T. Kobayashi, M. Yuyama, H. Harada, T. Osada, K. Kawagishi, Challenging the Limit of Strengthening by γ/γ′ Lattice Misfit on the High Temperature Creep Properties of Ni-Base Single Crystal Superalloy, Metall. Mater. Trans. A 57 (2026) 1794–1812. https://doi.org/10.1007/s11661-025-08089-5.