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Title: Laser peening: A tool for additive manufacturing post-processing

Abstract

Additive manufacturing (AM) is rapidly moving from research to commercial applications due to its ability to produce geometric features difficult or impossible to generate by conventional machining. Fielded components need to endure fatigue loadings over long operational lifetimes. This work evaluates the ability of shot and laser peening to enhance the fatigue lifetime and strength of AM parts. As previously shown, peening processes induce beneficial microstructure and residual stress enhancement; this work takes a step to demonstrate the fatigue enhancement of peening including for the case of geometric stress risers as expected for fielded AM components. We present AM sample fatigue results with and without a stress riser using untreated baseline samples and shot and laser peening surface treatments. Laser peening is clearly shown to provide superior fatigue life and strength. We also investigated the ability of analysis to select laser peening parameters and coverage that can shape and/or correctively reshape AM components to a high degree of precision. We demonstrated this potential by shaping and shape correction using our finite element based predictive modeling and highly controlled laser peening.

Authors:
 [1];  [1];  [2]; ORCiD logo [3];  [3]
  1. Curtiss Wright Surface Technologies - Metal Improvement Company, Livermore, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). National Ignition Facility (NIF). Photon Sciences Directorate
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physical and Life Sciences Directorate
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1497297
Report Number(s):
LLNL-JRNL-739309
Journal ID: ISSN 2214-8604; 892864
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Additive Manufacturing
Additional Journal Information:
Journal Volume: 24; Journal ID: ISSN 2214-8604
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; additive manufacturing; selective laser melting; laser powder bed fusion; fatigue; shot peening; laser peening; laser forming; laser form correction

Citation Formats

Hackel, Lloyd, Rankin, Jon R., Rubenchik, Alexander, King, Wayne E., and Matthews, Manyalibo. Laser peening: A tool for additive manufacturing post-processing. United States: N. p., 2018. Web. doi:10.1016/j.addma.2018.09.013.
Hackel, Lloyd, Rankin, Jon R., Rubenchik, Alexander, King, Wayne E., & Matthews, Manyalibo. Laser peening: A tool for additive manufacturing post-processing. United States. doi:10.1016/j.addma.2018.09.013.
Hackel, Lloyd, Rankin, Jon R., Rubenchik, Alexander, King, Wayne E., and Matthews, Manyalibo. Fri . "Laser peening: A tool for additive manufacturing post-processing". United States. doi:10.1016/j.addma.2018.09.013. https://www.osti.gov/servlets/purl/1497297.
@article{osti_1497297,
title = {Laser peening: A tool for additive manufacturing post-processing},
author = {Hackel, Lloyd and Rankin, Jon R. and Rubenchik, Alexander and King, Wayne E. and Matthews, Manyalibo},
abstractNote = {Additive manufacturing (AM) is rapidly moving from research to commercial applications due to its ability to produce geometric features difficult or impossible to generate by conventional machining. Fielded components need to endure fatigue loadings over long operational lifetimes. This work evaluates the ability of shot and laser peening to enhance the fatigue lifetime and strength of AM parts. As previously shown, peening processes induce beneficial microstructure and residual stress enhancement; this work takes a step to demonstrate the fatigue enhancement of peening including for the case of geometric stress risers as expected for fielded AM components. We present AM sample fatigue results with and without a stress riser using untreated baseline samples and shot and laser peening surface treatments. Laser peening is clearly shown to provide superior fatigue life and strength. We also investigated the ability of analysis to select laser peening parameters and coverage that can shape and/or correctively reshape AM components to a high degree of precision. We demonstrated this potential by shaping and shape correction using our finite element based predictive modeling and highly controlled laser peening.},
doi = {10.1016/j.addma.2018.09.013},
journal = {Additive Manufacturing},
number = ,
volume = 24,
place = {United States},
year = {2018},
month = {9}
}

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