Alternative Mechanical Surface Treatments: Microstructures, Residual Stresses & Fatigue Behavior
- Prof. Dr.-Ing Lothar Wagner Chairman of ICSP8
Published Online: 7 FEB 2006
Copyright © 2003 Wiley-VCH Verlag GmbH & Co. KGaA
How to Cite
Altenberger, I. (2003) Alternative Mechanical Surface Treatments: Microstructures, Residual Stresses & Fatigue Behavior, in Shot Peening (ed L. Wagner), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527606580.ch54
TU Clausthal, Institut für Werkstoffkunde und Werkstofftechnik, Agricolastr. 6, D-38678 Clausthal-Zellerfeld, Germany
- Published Online: 7 FEB 2006
- Published Print: 12 MAY 2003
Print ISBN: 9783527305377
Online ISBN: 9783527606580
- alternative mechanical surface treatments;
- residual stresses;
- fatigue behavior
In comparison to the most widely used mechanical surface treatment shot peening, common alternative methods such as deep rolling and less common methods such as laser shock peening, ultrasonic shot peening, water peening or various burnishing methods have been introduced into practical applications only rarely, or for highly specialized components, or are just on the verge from laboratory research into larger scale applications. However, in the future it is expected that these so called “alternative” mechanical surface treatment methods will be more widespread owing to superior benefits for materials' behavior, improving process technology and dramatically decreasing costs.
The basic principles of all mechanical surface treatments are well known: In all cases a localized elastic-plastic deformation in ear-surface regions leads to the formation of compressive residual stresses and severe microstructural alterations (usually associated with intense work hardening), enabling the thus strengthened near-surface regions to withstand higher resistance against fatigue crack initiation and propagation. Moreover, in some cases, additional effects may give rise to further fatigue life/strength enhancement such as surface smoothening or deformation-induced phase transformations. At closer look, ear surface properties and thus fatigue behavior might be distinctly different for different surface treatment methods. It is the objective of this contribution to shed some light on these basic effects and to propose some basic guidelines for the utilization of ‘optimized’ treatments from a materials science perspective.