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Title: Influence Of Shot Peening And Burnishing On Smooth And Notched Fatigue Strengths Of Titanium Alloys
Author: T. Ludian, J. Atoura and L. Wagner
Source: Conf Proc: ICSP-10 Tokyo, Japan 2008
Publication year 2008
Document number: 2008097
Number of pages: 6
Abstract:
ABSTRACT
The high cycle fatigue (HCF) response to shot peening (SP) and ball-burnishing (BB) of two titanium alloys - one belonging to the Ą -alloy class (Ti-2.5Cu) and the other
belonging to the metastable ƒÒ -alloy class (Beta C) - is compared and contrasted. Increases in surface layer hardness by process-induced high dislocation densities are
quite different between these two alloys owing to marked differences in work-hardening capabilities. The pronounced improvement in HCF performance of Ti-2.5Cu can be
correlated with the observed pronounced surface strengthening. On the other hand, surface strengthening is only marginal in Beta C which can explain the ineffectiveness of
shot peening and ball-burnishing in improving the HCF strength of this alloy. In contrast to smooth specimens, fatigue performance of notched specimens of Beta C is improved
by roller-burnishing (RB).
KEY WORDS Shot peening, ball-burnishing, roller-burnishing, residual stresses, HCF strength
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