日本金属学会誌

J. Japan Inst. Metals, Vol. 69, No. 8 (2005),
pp. 743-746

Long-Term Creep Property of a Second-Generation Nickel-Base Single-Crystal Superalloy, TMS-82+

Yutaka Koizumi, Hiroshi Harada, Toshiharu Kobayashi and Tadaharu Yokokawa

High Temperature Materials Group, Materials Engineering Laboratory, National Institute for Materials Science (NIMS), Tsukuba 305-0047

Abstract:

Long component-life of at least two years under a daily start and stop condition is required on turbine blades and vanes in land-based power plants. For this reason, a creep rupture life of 10000 hours or longer is required for the application of Ni-base superalloys. In this paper, long-term creep property of more than 15000 hours was analyzed for a second-generation Ni-base superalloy, TMS-82+. Consequently, Larson-Miller parameters in the range of C=12-14 resulted in good fits over the short-to-long-term creep rupture life, even though C=20 is conventionally used for Ni-base superalloys. In addition, the creep strength of TMS-82+ exceeds that of CMSX-4 under wide range of stress/temperature conditions, especially under the higher temperature and lower stress condition.


(Received 2005/4/25)

Keywords:

nickel-base superalloys, single crystal, second-generation, creep, TMS-82+, Larson-Miller Parameter(LMP)


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