50-Fold Difference in Region-II Fatigue Crack Propagation Resistance of Titanium Alloys: A Grain-Size Effect

[+] Author and Article Information
G. R. Yoder, L. A. Cooley, T. W. Crooker

Material Science and Technology Division, Naval Research Laboratory, Washington, D.C. 20375

J. Eng. Mater. Technol 101(1), 86-90 (Jan 01, 1979) (5 pages) doi:10.1115/1.3443656 History: Received September 11, 1978; Revised October 20, 1978; Online August 17, 2010


Fatigue crack growth rates (da/dN) in ambient laboratory air have been determined for a wide variety of materials from four basic α + β titanium alloy systems. Each material was cyclically loaded with a haversine waveform and a load ratio, R = 0.10. The results indicate that, at a constant value of stress-intensity range (ΔK), the width of the da/dN data band exceeds an order of magnitude. For example, at ΔK = 21 MPa·m1/2 , a 50-fold difference in fatigue crack propagation rates is observed. Analysis of the crack growth rate data at this point indicates a systematic dependence on grain size (l ), viz. that da/dN decreases with increasing l . An interpretation of this effect is offered in terms of reversed (cyclic) plastic zone size considerations.

Copyright © 1979 by ASME
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