Surface characteristics and fatigue behavior of shot peened Inconel 718

Surface characteristics and fatigue behavior of shot peened Inconel 718 International Journal of Fatigue 110 (2018) 10–21 Contents lists available at ScienceDirect International Journal of Fatigue journal homepage: www.elsevier.com/locate/ijfatigue a, a,b b a a T. Klotz , D. Delbergue , P. Bocher , M. Lévesque , M. Brochu Département de génie mécanique, École Polytechnique de Montréal, Qc H3T 1J4 Montréal, Canada Département de génie mécanique, École de Technologie Supérieure, Qc H3C 1K3 Montréal, Canada ARTICLE I NFO ABSTRACT Keywords: Shot peening is commonly used in the aerospace industry to improve mechanical components fatigue life. It Inconel 718 introduces compressive residual stresses and cold work at the surface which tend to close short fatigue cracks Fatigue and delay their propagation, respectively. However, shot peening also creates surface irregularities that can be Crack initiation detrimental to fatigue. The effect of different shot peening conditions on Inconel 718 tested in low and high cycle Shot peening fatigue is presented in this study. An analysis of the fatigue life, crack initiation mechanisms, residual stress Residual stresses relaxation relaxation, process induced strain hardening and surface roughness showed that, in high cycle fatigue, shot peening can increase Inconel 718 fatigue life from 2 to 20 times, depending on the shot peening conditions. This observation suggests http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Fatigue Elsevier

Surface characteristics and fatigue behavior of shot peened Inconel 718

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Publisher
Elsevier
Copyright
Copyright © 2018 Elsevier Ltd
ISSN
0142-1123
eISSN
1879-3452
D.O.I.
10.1016/j.ijfatigue.2018.01.005
Publisher site
See Article on Publisher Site

Abstract

International Journal of Fatigue 110 (2018) 10–21 Contents lists available at ScienceDirect International Journal of Fatigue journal homepage: www.elsevier.com/locate/ijfatigue a, a,b b a a T. Klotz , D. Delbergue , P. Bocher , M. Lévesque , M. Brochu Département de génie mécanique, École Polytechnique de Montréal, Qc H3T 1J4 Montréal, Canada Département de génie mécanique, École de Technologie Supérieure, Qc H3C 1K3 Montréal, Canada ARTICLE I NFO ABSTRACT Keywords: Shot peening is commonly used in the aerospace industry to improve mechanical components fatigue life. It Inconel 718 introduces compressive residual stresses and cold work at the surface which tend to close short fatigue cracks Fatigue and delay their propagation, respectively. However, shot peening also creates surface irregularities that can be Crack initiation detrimental to fatigue. The effect of different shot peening conditions on Inconel 718 tested in low and high cycle Shot peening fatigue is presented in this study. An analysis of the fatigue life, crack initiation mechanisms, residual stress Residual stresses relaxation relaxation, process induced strain hardening and surface roughness showed that, in high cycle fatigue, shot peening can increase Inconel 718 fatigue life from 2 to 20 times, depending on the shot peening conditions. This observation suggests

Journal

International Journal of FatigueElsevier

Published: May 1, 2018

References

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