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Assessment of residual strain in laser shock peened additive manufactured Inconel 718 using synchrotron x-ray diffraction

DOI: 10.1016/j.mtla.2023.101843 DOI Help

Authors: Ching Kiat Yong (University of Warwick) , Elspeth M. Keating (University of Warwick) , Darren J. Hughes (University of Warwick) , Thomas Connolley (Diamond Light Source) , Geoff West (University of Warwick) , Chow Cher Wong (Advanced Remanufacturing and Technology Centre (ARTC) (Singapore)) , Gregory J Gibbons (University of Warwick)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Materialia , VOL 5

State: Published (Approved)
Published: July 2023
Diamond Proposal Number(s): 27288

Open Access Open Access

Abstract: The through-thickness residual strain profile due to laser shock peening (LSP) of an additively-manufactured IN718 sample is shown for the first time. The results provide tantalising insight into the potential of fatigue life extension of additive-manufactured samples using LSP. Residual strains were measured in as-manufactured and peened samples using state-of-the-art synchrotron radiation. Significant beneficial compressive in-plane residual strains, extending to 1.0 mm depth, were observed due to the peening process. No phase changes were observed due to LSP. A periodic strain variation was observed arising from the layer-by-layer manufacturing strategy of the samples. The peened sample showed no increase in diffraction peak width in the near-surface regions. This is contrary to reported studies using wrought laser shock peened alloys and suggests less grain disruption in additively-manufactured peened samples. The results are timely given a current drive to adopt additive-manufacturing for a step-change in efficiency of aero-engine component production.

Diamond Keywords: Additive Manufacturing; Alloys

Subject Areas: Materials, Engineering

Instruments: I12-JEEP: Joint Engineering, Environmental and Processing

Added On: 05/07/2023 09:26


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Materials Engineering & Processes Aerospace Materials Science Engineering & Technology Metallurgy

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