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Title: Stress Relaxation Resistance For Improved Fatigue Performance Of Shot Peened Tool Components
Author: Medvedeva, Bergström, Gunnarsson, Höglund
Source: Conf Proc: ICSP-10 Tokyo, Japan 2008
Publication year 2008
Document number: 2008083
Number of pages: 9
Abstract:
ABSTRACT
Shot peening is an extensively used process in the production of mechanical components to improve their fatigue strength at ambient temperature. At higher working
temperatures of some mechanical components, e.g. from 300 to 600..C, the influence and behaviour of the compressive residual stresses are more uncertain, since they tend to
relieve at higher temperatures. The response to shot peening induced residual stresses of low alloyed and hot work tool steels was evaluated with respect to stress relief
heat treatments and isothermal high temperature fatigue testing. Not only the residual stresses, but also the material substructure and its dislocation characteristics are
of importance. Dislocation structures were determined using X-ray diffraction to explain the preference of the different steel grades. Also, results obtained from bending
fatigue testing at ambient temperature of tool components after shot peening and stress relief heat treatments demonstrated the different ability of retaining the fatigue
strength.
KEY WORDS
Shot peening, Fatigue strength, Isothermal fatigue, Residual stress, Stress relaxation
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This page last revised: 03/22/2010