Glocal integrity in 420 stainless steel by asynchronous laser processing

Authors

Michael P. Sealy, University of Nebraska-LincolnFollow
Haitham Hadidi, University of Nebraska-LincolnFollow
Cody Kanger, University of Nebraska-LincolnFollow
X. L. Yan, University of Nebraska–LincolnFollow
Bai Cui, University of Nebraska-LincolnFollow
J. A. McGeough, University of EdinburghFollow

Document Type

Article

Date of this Version

2019

Citation

Published in CIRP Annals—Manufacturing Technology (2019)

doi 10.1016/j.cirp.2019.04.105

Comments

Copyright © 2019. Published by Elsevier Ltd on behalf of CIRP. Used by permission.

Abstract

Cold working individual layers during additive manufacturing (AM) by mechanical surface treatments, such as peening, effectively “prints” an aggregate surface integrity that is referred to as a glocal (i.e., local with global implications) integrity. Printing a complex, pre-designed glocal integrity throughout the build volume is a feasible approach to improve functional performance while mitigating distortion. However, coupling peening with AM introduces new manufacturing challenges, namely thermal cancellation, whereby heat relaxes favorable residual stresses and work hardening when printing on a peened layer. Thus, this work investigates glocal integrity formation from cyclically coupling LENS® with laser peening on 420 stainless steel.