Dwell Sensitive Fatigue Response of Titanium Alloys for Power Plant Applications
Author:
Bache M. R.1, Evans W. J.1
Affiliation:
1. I.R.C. in Computer Aided Materials Engineering, Department of Materials Engineering, University of Wales, Swansea SA2 8PP, UK
Abstract
The phenomenon of “dwell sensitivity” in the α+β and near α titanium alloys and the intrinsic relationship with quasi-cleavage facet formation is discussed. In the present paper, particular emphasis is placed upon the role of “cold creep” and ambient temperature strain accumulation under cyclic loading. A process of stress redistribution between microstructurally distinct regions that demonstrate different strengths is proposed as the fundamental cause of facet development and subsequent dwell failures. A model to describe the redistribution process is validated through a matrix of fatigue testing designed to assess the effects of microstructural form, stress axiality, and periods of dwell loading at peak stress on cyclic strain accumulation.
Publisher
ASME International
Subject
Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering
Reference9 articles.
1. Allen, P. G., Bania, P. J., Hutt, A. J., and Combres, Y., 1996, “LCB: A Low Cost Beta Alloy for Automotive and Other Industrial Applications,” Titanium ’95, P. A. Blenkinsop, W. J. Evans and H. M. Flower, eds., Eighth World Conference on Titanium, Birmingham, Oct. IOM, London, pp. 1680–1687. 2. Ruffles, P., 1995, “The Foresight Challenge,” Materials World, 3, IOM, London, pp. 469–470. 3. Wojcik, C. C., Khan, K. S., and Koss, D. A., 1988, “Stage I Fatigue Crack Propagation in a Titanium Alloy,” Acta Metall., 36, p. 12611261. 4. Evans, W. J. , 1987, “The Influence of Microstructure on Dwell Sensitive Fatigue in a Near Alpha Titanium Alloy,” Scr. Metall., 21, p. 469469. 5. Evans, W. J., and Bache, M. R., 1994, “Dwell Sensitive Fatigue Under Biaxial Loads in the Near-Alpha Titanium Alloy IMI685, ” Int. J. Fatigue, 16, pp. 443–452.
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