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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.55  No.3 (2006)  >  pp.309-316

Journal of the Society of Materials Science, Japan
<<Previous article Vol.55  No.3 (2006)   pp.309 - 316 Next article>>

High Temperature Fatigue Life Analysis of Single Crystal Ni-Base Superalloys Considering γ/γ' Microstructure

Motoki SAKAGUCHI1) and Masakazu OKAZAKI2)
1) Nagaoka Univ. of Tech.
2) Dept. of Mech. Eng., Nagaoka Univ. of Tech.


Strain controlled thermo-mechanical fatigue (TMF) and low cycle fatigue (LCF) tests were conducted in a single crystal Ni-based superalloy, CMSX-4, under various test conditions. At first, it was shown ex-perimentally that the superalloy revealed the TMF and LCF lives associated with some unique charac-teristics, which were not always interpreted well, so far as the traditional stress-based and/or strain-based criteria were employed : e.g., Manson-Coffin law and Ostergren method. New micromechanics model is proposed to estimate the TMF and LCF lives taking account of the unique microstructure of superalloys. The proposed method enabled us to estimate some unique characteristics in the TMF and LCF failures of superalloys, although some quantitative hurdles should be overcome further.


Keyword:
Single crystal Ni-base superalloy, Low cycle fatigue, Thermo-mechanical fatigue, γ/γ' microstructure, Eshelby's micromechanics theory, Mori-Tanaka’s theory, Plastic work

Received: July 19, 2005
Published online: April 26, 2006
Copyright (c) 2006 by The Society of Materials Science, Japan

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