Residual stress and texture control in Ti-6Al-4V wire + arc additively manufactured intersections by stress relief and rolling

J.R. Honnige, P.A. Colegrove, Bilal Ahmed, Michael Fitzpatrick, S. Ganguly, T.L. Lee, S.W. Williams

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Abstract

Additively manufactured intersections have the theoretical risk to contain hydrostatic tensile residual stresses, which eventually cannot be thermally stress relieved. The stresses in Ti-6Al-4V wire + arc additively manufactured (WAAM) intersections are lower compared to single pass walls and stresses in continuous walls are larger compared to discontinuous walls with otherwise identical geometry. Thermal stress relief was found to virtually eliminate them. Inter-pass rolling can yield the desired grain refinement, without having any noteworthy influence on the development of residual stresses. The strain measurement itself by neutron diffraction is facilitated by the refined microstructure, because the otherwise textured microstructure produces anisotropic peak intensity, not allowing Pawley refinement. Without rolling, the f1011g and f1013g family of hcp planes are the only ones that diffract consistently in the three principal directions.
Original languageEnglish
Pages (from-to)193-205
Number of pages13
JournalMaterials & Design
Volume150
Early online date8 Apr 2018
DOIs
Publication statusPublished - 15 Jul 2018

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Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Materials & Design. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Materials & Design, [150, (2018)] DOI: 10.1016/j.matdes.2018.03.065

© 2018, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

  • Wire + arc additive manufacturing
  • Intersections
  • Rolling
  • Stress relieving
  • Ti-6Al-4V
  • Microstructure

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