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Title: Effect of Prior Cold Work on Fatigue Performance of Shot Peened TI-2.5CU
Author: H. Boeckels and L. Wagner
Source: Conf Proc: ICSP-9 (pg 322-337)
Publication year 2005
Document number: 2005106
Number of pages: 6
Abstract:
INTRODUCTION
Ti2.5Cu is an age-hardenable a-titanium alloy commonly used at ambient and slightly elevated temperatures up to 350°C. High strengths are achieved by solution heat treating
at 805°C followed by a two-step aging treatment of 400°C for 8h + 475°C for 8h. These aging cycle leads to the formation of finely dispersed Ti2Cu precipitates in the
a-matrix [1]. As often observed in age-hardenable alloys, cold working prior to aging results in improved strength values. Since Ti-2.5Cu in the solution heat treated
condition is capable of undergoing considerable cold deformation without cracking, any forming operation is normally carried out prior to aging [2]. Forming operations
(e.g., bending) which result in gradients of plastic deformation will after the aging treatment lead to a graded material with highest strengths at locations where the prior
deformation was at maximum. Because fatigue performance of Ti-2.5Cu is a major issue in aircraft application [3], the effect of shot peening on potential fatigue strength
improvements was studied on materials with varuious degrees of prior plastic deformation.
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