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Title: Directional and oscillating residual stress on the mesoscale in additively manufactured Ti-6Al-4V [ Mesoscale and anisotropic residual stress in additive manufacturing of Ti-6Al-4V]

Abstract

In additive manufacturing of metals as compared to conventional processing, the directional track-by-track and layer-by-layer nature of the fabrication process can lead to residual stresses that locally are both directionally and spatially heterogeneous. Much of the existing literature has focused either on the macroscale residual stress inside the entire part, or on the microscale residual stresses that are created around a scan vector, thereby neglecting the intermediate length-scale of the different layers. The objective of this research is to investigate such mesoscale residual stress distributions across several layers in Ti-6Al-4V components produced by laser metal deposition process. The incremental centre hole drilling and incremental slitting methods provide measurements with excellent spatial resolution within and across the layer length scale. Here in this work, the two methods complemented each other to quantify both mesoscale and directional variations of residual stress that correlate with the deposition pattern. Lastly, our findings also provide strong evidence that an oscillatory residual stress variation persists even after thermal cycling that occurs during deposition of subsequent layers.

Authors:
 [1]; ORCiD logo [2];  [3];  [4];  [5]; ORCiD logo [3];  [6]; ORCiD logo [7]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Vrije Univ., Amsterdam (Netherlands). Dept. of Mechanics of Materials and Constructions
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Katholieke Univ. Leuven, Leuven (Belgium). Dept. of Materials Engineering
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of Bristol, Bristol (United Kingdom). Dept. of Mechnical Engineering
  5. Vlaamse Instelling voor Technologisch Onderzoek (VITO), Mol (Belgium)
  6. Vrije Univ. Brussel, Brussels (Belgium). Dept. of Mechanical Engineering
  7. Vrije Univ., Amsterdam (Netherlands). Dept. of Mechanics of Materials and Constructions
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1512590
Report Number(s):
LLNL-JRNL-746687
Journal ID: ISSN 1359-6454; 931493
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 168; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Strantza, M., Vrancken, B., Prime, M. B., Truman, C. E., Rombouts, M., Brown, D. W., Guillaume, P., and Van Hemelrijck, D.. Directional and oscillating residual stress on the mesoscale in additively manufactured Ti-6Al-4V [ Mesoscale and anisotropic residual stress in additive manufacturing of Ti-6Al-4V]. United States: N. p., 2019. Web. doi:10.1016/j.actamat.2019.01.050.
Strantza, M., Vrancken, B., Prime, M. B., Truman, C. E., Rombouts, M., Brown, D. W., Guillaume, P., & Van Hemelrijck, D.. Directional and oscillating residual stress on the mesoscale in additively manufactured Ti-6Al-4V [ Mesoscale and anisotropic residual stress in additive manufacturing of Ti-6Al-4V]. United States. doi:10.1016/j.actamat.2019.01.050.
Strantza, M., Vrancken, B., Prime, M. B., Truman, C. E., Rombouts, M., Brown, D. W., Guillaume, P., and Van Hemelrijck, D.. Mon . "Directional and oscillating residual stress on the mesoscale in additively manufactured Ti-6Al-4V [ Mesoscale and anisotropic residual stress in additive manufacturing of Ti-6Al-4V]". United States. doi:10.1016/j.actamat.2019.01.050.
@article{osti_1512590,
title = {Directional and oscillating residual stress on the mesoscale in additively manufactured Ti-6Al-4V [ Mesoscale and anisotropic residual stress in additive manufacturing of Ti-6Al-4V]},
author = {Strantza, M. and Vrancken, B. and Prime, M. B. and Truman, C. E. and Rombouts, M. and Brown, D. W. and Guillaume, P. and Van Hemelrijck, D.},
abstractNote = {In additive manufacturing of metals as compared to conventional processing, the directional track-by-track and layer-by-layer nature of the fabrication process can lead to residual stresses that locally are both directionally and spatially heterogeneous. Much of the existing literature has focused either on the macroscale residual stress inside the entire part, or on the microscale residual stresses that are created around a scan vector, thereby neglecting the intermediate length-scale of the different layers. The objective of this research is to investigate such mesoscale residual stress distributions across several layers in Ti-6Al-4V components produced by laser metal deposition process. The incremental centre hole drilling and incremental slitting methods provide measurements with excellent spatial resolution within and across the layer length scale. Here in this work, the two methods complemented each other to quantify both mesoscale and directional variations of residual stress that correlate with the deposition pattern. Lastly, our findings also provide strong evidence that an oscillatory residual stress variation persists even after thermal cycling that occurs during deposition of subsequent layers.},
doi = {10.1016/j.actamat.2019.01.050},
journal = {Acta Materialia},
number = C,
volume = 168,
place = {United States},
year = {2019},
month = {4}
}

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This content will become publicly available on April 15, 2020
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