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Title: Influence Of Shot Peening On The Fatigue Behaviour Of Titanium Alloys
Author: Wagner, L. and Lutjering, G.
Source: Conf Proc: ICSP-1, (p.453-460)
Publication year 1981
Document number: 1981036
Number of pages: 8
Abstract:
The effect of shot peening on the change of the surface layer properties and their influence on the fatigue behavior of Ti alloys in vacuum and aggressive environments was
investigated. The influence of each of the important parameters (residual stresses, dislocation density and surface roughness) was evaluated separately for Ti--6A1--4V and
Ti--8.6A1. If the residual stresses remained stable during fatigue their influence on fatigue strength was characteristically different for push--pull compared to rotating
beam testing. The results showed that residual stresses could increase or decrease the fatige life. The stability of the residual stresses depended on the material cyclic
hardening or softening behavior. Depending on many contributing factors crack nucleation occurred at the surface or inside the material. If crack nucleation occurred at the
specimen surface the high dislocation density delayed nucleation whereas an increasing surface roughness had the opposite effect.
Descriptors: Titanium base alloys-- Mechanical properties; Fatigue life; Shot Peening; Surface properties; Residual stress
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