High temperature fatigue behavior and residual stress stability of laser-shock peened and deep rolled austenitic steel AISI 304

In this paper, we investigate how laser-shock peening and deep rolling affect the cyclic deformation and S/N-behavior of austenitic stainless steel AISI 304 at elevated temperatures (up to 600 degreesC). The results demonstrate that laser shock peening can produce similar amounts of lifetime enhancements as deep rolling. The cycle, stress amplitude and temperature-dependent relaxation of compressive residual stresses is more pronounced than the decrease of near-surface work hardening. (C) 2004 Acta Materialia, Inc. Published by Elsevier Ltd. All rights reserved.