Fatigue crack growth transitions in Ti-6Al-4V alloy

Ravichandran, KS and Dwarakadasa, ES (1989) Fatigue crack growth transitions in Ti-6Al-4V alloy. In: Scripta Metallurgica, 23 (10). pp. 1685-1690.

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Abstract

There are 2 transitions during fatigue crack growth in Ti-6Al-4V alloy, caused by cyclic and monotonic plastic zones when their resp. sizes become equal to the $\alpha$ lath size. The transition due to cyclic plastic zone size is a combined action of environment and the stage where cyclic plastic zone size becomes equal to lath size. Crack closure levels exhibited a transition. The crack path exhibited multiple crack branching at this transition. The cyclic plastic zone size is uniquely related with $\delta$Keff (closure-free stress intensity range) as against $\delta$K at large crack closure. A transition occurred when the monotonic plastic zone size was equal to the $\alpha$ lath size, and this is attributed to the change from continuum to single crystal behavior at the crack tip. Both the transitions were induced by $\alpha$ laths because of thick interplatelet $\beta$ layer in the microstructure.

Item Type:	Journal Article
Publication:	Scripta Metallurgica
Publisher:	Pergamon Press plc.
Additional Information:	Copyright of this article belongs to Pergamon Press plc.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	25 Feb 2008
Last Modified:	19 Sep 2010 04:42
URI:	http://eprints.iisc.ac.in/id/eprint/12834

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