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Title: Influence Of A Shot Peening Treatment On The Fatigue Limit Of Ti-6a1-4v
Author: Wagner, L. and Lutjering, G.
Source: Conf Proc: ICSP-2, (p.201-207)
Publication year 1984
Document number: 1984031
Number of pages: 7
Abstract:
The effect of shot peening on the fatigue limit of various microstructures of the Ti-6A1-4V alloy tested at R = -1 in inert and corrosive environments was studied. From a
previous work on the influence of the shot peening parameters on the fatigue life on Ti-6A1-4V (Wagner et al, 1984) the shot peening treatment, which resulted in the most
marked improvement of fatigue life in an aggressive environment, was chosen. The fatigue tests were performed using push-pull loading in vacuum and 3.5% NaC1 solution and
rotating-beam specimens in laboratory air. For the push-pull tests in vacuum generally a drastic loss in the fatigue limit of shot peened specimens compared to the
electrolytically polished condition was observed. On the other hand, by testing in 3.5% NaC1 solution no change or a slight improvement in fatigue limit, depending on the
microstructure, was found after shot peening. In contrast to push-pull loading the fatigue limit of shot peened rotating-beam specimens tested in laboratory air was always
improved compared to the electrolytically polished condition.
Descriptors: Shot peening; Dislocation density; Residual stresses; Surface roughness; Cyclic stability of the residual stresses; Fatigue crack nucleation and propagation;
Environmental effects.
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