Effect of Microstructure on Thermo-Mechanical and Isothermal Low Cycle Fatigue Failures of a Single Crystal Ni-Base Superalloy

Abstract:

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Behavior of thermo-mechanical fatigue (TMF) failure of a single crystal Ni-base superalloy, CMSX-4, was studied and, compared with isothermal low-cycle fatigue (ILCF) of it. Strain-controlled TMF and ILCF tests of CMSX-4 were carried out under various test conditions, where the experimental variables were strain rates, strain ratio, test temperature and the range, and strain/temperature phase angle. At first it was shown from the experiments that the TMF and LCF failures associated with some noteworthy characteristics were rarely seen in the traditional pollycrystalline heat-resistant alloys. These phenomena could be explained inadequately, on the basis of the macroscopic parameters and the historical failure criteria; e.g., Manson-Coffin law and Ostergren approach. A new micromechanics model is proposed to predict the TMF and LCF lives, based on the Eshelby's theory.

Info:

Periodical:

Key Engineering Materials (Volumes 353-358)

Edited by:

Yu Zhou, Shan-Tung Tu and Xishan Xie

Pages:

491-494

DOI:

10.4028/www.scientific.net/KEM.353-358.491

Citation:

M. Sakaguchi and M. Okazaki, "Effect of Microstructure on Thermo-Mechanical and Isothermal Low Cycle Fatigue Failures of a Single Crystal Ni-Base Superalloy", Key Engineering Materials, Vols. 353-358, pp. 491-494, 2007

Online since:

September 2007

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Price:

$35.00

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