Fatigue performance improvement in AISI 4140 steel by dynamic strain aging and dynamic precipitation during warm laser shock peening

Gary Cheng, Birck Nanotechnology Center, Purdue University
Chang Ye, Birck Nanotechnology Center, Purdue University
Sergey Suslov, Birck Nanotechnology Center, Purdue University
Bong Joong Kim, Birck Nanotechnology Center, Purdue University
Eric A. Stach, Birck Nanotechnology Center, Purdue University

Date of this Version

2-2011

Citation

Acta Materialia Volume 59, Issue 3, February 2011, Pages 1014–1025

Abstract

Warm laser shock peening (WLSP) is a thermomechanical treatment technique combining the advantages of laser shock peening and dynamic strain aging (DSA). Through DSA, WLSP of steel increases the dislocation density and stabilizes the dislocation structure by pinning of mobile dislocations by carbon atoms. In addition, WLSP generates nanoscale carbide precipitates through strain-induced precipitation. The carbide precipitates stabilize the microstructure by dislocation pinning. This results in higher stability of the dislocation structure and thus improves the stability of the compressive residual stress. In this study the mechanism of fatigue performance improvement in AISI 4140 steel by WLSP is investigated. It is found that microstructures formed after WLSP lead to a higher stability of dislocation structures and residual stress, which are beneficial for fatigue performance. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Discipline(s)

Nanoscience and Nanotechnology

 

Share