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TECHNICAL PAPERS

High Temperature Multiaxial Low Cycle Fatigue of CMSX-2 NI-Base Single Crystal Superalloy

[+] Author and Article Information
Mitsuru Kanda, Masao Sakane, Masateru Ohnami

Department of Mechanical Engineering, Faculty of Science and Engineering, Ritsumeikan University, 1-1-1 Nojihigashi Kusatsu-shi Shiga 525-77, Japan

Tadashi Hasebe

Department of Mechanical Engineering, Faculty of Engineering, Doshisha University, 1-3 Tataramiyakodani Tanabe-cho Tsuzuki-gun Kyoto 610-03, Japan

J. Eng. Mater. Technol 119(2), 153-160 (Apr 01, 1997) (8 pages) doi:10.1115/1.2805988 History: Received April 22, 1995; Revised November 29, 1996; Online November 27, 2007

Abstract

This paper describes studies of the tension-torsion multiaxial low cycle fatigue of CMSX-2 Ni-base single crystal superalloy. Tension-torsion low cycle fatigue tests were carried out at 1173K using CMSX-2 hollow cylinder specimens aligned with the {001} axis. Several multiaxial strain and stress parameters were applied to the experimental data to examine the suitability of the parameters to life prediction. All the strain parameters proposed so far gave a large scatter of the data correlation. Discrepant data correlation with the strain parameters resulted from the anisotropic stress response due to the crystallographic texture. Larger Mises equivalent stress was applied in torsion tests than in tension tests at the same Mises strain. However, Mises stress and the equivalent stress based on crack opening displacement gave a satisfactory data correlation. This study developed a new equivalent strain, taking account of the anisotropy of the elastic constants, which correlates the multiaxial low cycle fatigue data with a small scatter.

Copyright © 1997 by The American Society of Mechanical Engineers
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