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Title: High Temperature Fatigue of Mechanically Surface Treated Materials
Author: Altenberger, Noster, Scholtes, Ritchie
Source: Conf Proc: ICSP-8 Sept. 16-20, 2002 Garmisch-Partenkirchen, Germany pps. 48
Publication year 2002
Document number: 2002063
Number of pages: 7
Abstract:
Authors
Igor Altenberger 1, Ulf Noster 2, Berthold Scholtes 2, Robert O. Ritchie 1
1 Department of Materials Science & Engineering, University of California, Berkeley, CA, USA
2 Institute of Materials Technology, University Kassel, Kassel, Germany
Introduction
The most well known effect of mechanical surface treatments on metallic materials is the improvement in fatigue properties. It is therefore not surprising that most of the
archival literature on mechanical surface treatments, such as shot peening, deep rolling and laser shock peening, deals with the effect of near-surface properties on fatigue
behavior. Most of these studies, however, are confined to room temperature fatigue behavior; in comparision, the effect of mechanical surface treatment on fatigue behavior
at high temperatures has been rarely investigated [1-5]. The reason for this disparity can be found in the popular belief that fatigue strength improvement by mechanical
surface treatments is mainly due to the presence of compressive residual stresses, and since such stresses should anneal out at elevated temperatures, mechanical surface
treatments for high temperature applications would appear questionable. However, this view may be over simplistic as there is always a possibility that the residual stresses
may be at least partially stable at elevated temperatures [6]; in addition, other factors may be involved, such as the nature of the near-surface microstructure.
Accordingly, it is the objective of this study to examine the role of mechanical surface treatments on the high temperature fatigue behavior of several metallic engineering
materials. Moreover, it is the aim of this work to clarify what are the critical temperature "thresholds' at which near-surface microstructures and residual stresses become
unstable and whether this can explain the observed fatigue behavior.
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