Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7172866 | International Journal of Fatigue | 2007 | 9 Pages |
Abstract
Deep rolling was applied to solution-heat-treated (as-quenched) AA6110 at room temperature. Subsequently, the deep rolled as-quenched specimens were aged at different temperatures and times. Push-pull fatigue tests were performed at room temperature to evaluate the optimized ageing condition. Cyclic deformation behavior, s/n-curves and depth profiles of near-surface residual stresses and full width at half maximum (FWHM) values of X-ray diffraction peaks as well as hardnesses are presented as compared to the conventional mechanical surface treatment (ageing followed by deep rolling). Thermal residual stress relaxation was investigated by applying a Zener-Wert-Avrami function. It was found that fatigue lifetimes of deep rolled as-quenched AA6110 after ageing were governed by near-surface hardness. Work- as well as precipitation hardening in near-surface regions enhances the fatigue lifetime significantly. Deep rolling after optimized ageing treatment can combine the work- and precipitation hardening in near surface regions and thus results in excellent fatigue strength of AA6110.
Related Topics
Physical Sciences and Engineering
Engineering
Mechanical Engineering
Authors
P. Juijerm, I. Altenberger, B. Scholtes,