Metallurgical Transactions A

, Volume 11, Issue 6, pp 1007–1017 | Cite as

The influence of grain orientation on the mode and rate of fatigue crack growth inα-titanium

  • C. M. Ward-Close
  • C. J. Beevers
Mechanical Behaviour
Received:

Abstract

The high cycle fatigue crack growth characteristics of coarse grainedα-titanium have been studied in vacuum, air, water and brine. Tests were carried out on single-edge-notch tension test-pieces at anR ratio of 0.35, a frequency of 130 Hz, and a ΔK range of 5 to 25 MPa-√m. The use of channelling patterns in the SEM permitted detailed crystallographic information to be correlated with fatigue fracture morphologies. Three distinct modes of fatigue crack growth were identified. Cleavage-like facets on the basal planes (0002); the formation of which was encouraged by increasing severity of environment and increasing stress normal to (0002), striations on planes normal to (0002) consistent with a mechanism involving intersecting prism slip systems, and furrows in the [0001] direction associated with fine lines parallel to the 1123 direction. It is shown how the relationships between grain orientation, stress geometry and testing environment may be presented in the form of Grain Orientation Control Maps. The rate of fatigue crack growth in individual grains was dominated by the mode of growth; below a ΔK of 10 MPa√m the cleavage-like mode was up to 10 times more rapid than the other modes of growth.

Keywords

Fatigue Metallurgical Transaction Crack Growth Rate Fatigue Crack Growth Crack Front 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© American Society for Metals and The Metallurgical Society of AIME 1980

Authors and Affiliations

  • C. M. Ward-Close
    • 1
  • C. J. Beevers
    • 2
  1. 1.Materials DepartmentRoyal Aircraft EstablishmentFarnboroughUK
  2. 2.Department of Physical Metallurgy and Science of MaterialsThe University of BirminghamBirmingham

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