Microtexture in additively manufactured Ti-6Al-4V fabricated using directed energy deposition

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Abstract

The additive manufacturing (AM) of α + β titanium alloys using electron beam (EB) and laser directed energy deposition (DED) processes has been widely characterized in both the as-deposited and post processed conditions. Fine basket weave α lath structures are commonly observed in both the as-deposited and post processed hot isostatically pressed (HIP) conditions for both laser and EB DED processes, but more in-depth knowledge of the crystallographic texturing and variant selection of the α laths growing from the primary β-grains across the height of EB DED Ti-6Al-4V structures is not well established. At locations near the substrate in both conditions, microtexturing is weak, but EB DED builds exhibit a strong microtexture and pronounced variant selection with increasing build height. On the other hand, the laser DED builds displayed weak texturing and no prominent variant selection across all heights. With the addition of HIP post processing, there was no change in microtexturing of the coarsened α laths for both the laser and EB structures, and the same variant selection observed in the as-deposited EB DED builds was present.

Original languageEnglish (US)
Pages (from-to)149-163
Number of pages15
JournalMaterials Science and Engineering A
Volume734
DOIs
StatePublished - Sep 12 2018

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Electron beams
electron beams
Texturing
Laser beams
energy
3D printers
laser beams
baskets
Lasers
titanium alloys
Titanium alloys
lasers
manufacturing
Substrates
Processing

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

@article{817974503414474f816137be55a6037e,
title = "Microtexture in additively manufactured Ti-6Al-4V fabricated using directed energy deposition",
abstract = "The additive manufacturing (AM) of α + β titanium alloys using electron beam (EB) and laser directed energy deposition (DED) processes has been widely characterized in both the as-deposited and post processed conditions. Fine basket weave α lath structures are commonly observed in both the as-deposited and post processed hot isostatically pressed (HIP) conditions for both laser and EB DED processes, but more in-depth knowledge of the crystallographic texturing and variant selection of the α laths growing from the primary β-grains across the height of EB DED Ti-6Al-4V structures is not well established. At locations near the substrate in both conditions, microtexturing is weak, but EB DED builds exhibit a strong microtexture and pronounced variant selection with increasing build height. On the other hand, the laser DED builds displayed weak texturing and no prominent variant selection across all heights. With the addition of HIP post processing, there was no change in microtexturing of the coarsened α laths for both the laser and EB structures, and the same variant selection observed in the as-deposited EB DED builds was present.",
author = "Waryoba, {Daudi Rigenda} and Keist, {Jayme Scot} and C. Ranger and Todd Palmer",
year = "2018",
month = "9",
day = "12",
doi = "10.1016/j.msea.2018.07.098",
language = "English (US)",
volume = "734",
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journal = "Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing",
issn = "0921-5093",
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TY - JOUR

T1 - Microtexture in additively manufactured Ti-6Al-4V fabricated using directed energy deposition

AU - Waryoba, Daudi Rigenda

AU - Keist, Jayme Scot

AU - Ranger, C.

AU - Palmer, Todd

PY - 2018/9/12

Y1 - 2018/9/12

N2 - The additive manufacturing (AM) of α + β titanium alloys using electron beam (EB) and laser directed energy deposition (DED) processes has been widely characterized in both the as-deposited and post processed conditions. Fine basket weave α lath structures are commonly observed in both the as-deposited and post processed hot isostatically pressed (HIP) conditions for both laser and EB DED processes, but more in-depth knowledge of the crystallographic texturing and variant selection of the α laths growing from the primary β-grains across the height of EB DED Ti-6Al-4V structures is not well established. At locations near the substrate in both conditions, microtexturing is weak, but EB DED builds exhibit a strong microtexture and pronounced variant selection with increasing build height. On the other hand, the laser DED builds displayed weak texturing and no prominent variant selection across all heights. With the addition of HIP post processing, there was no change in microtexturing of the coarsened α laths for both the laser and EB structures, and the same variant selection observed in the as-deposited EB DED builds was present.

AB - The additive manufacturing (AM) of α + β titanium alloys using electron beam (EB) and laser directed energy deposition (DED) processes has been widely characterized in both the as-deposited and post processed conditions. Fine basket weave α lath structures are commonly observed in both the as-deposited and post processed hot isostatically pressed (HIP) conditions for both laser and EB DED processes, but more in-depth knowledge of the crystallographic texturing and variant selection of the α laths growing from the primary β-grains across the height of EB DED Ti-6Al-4V structures is not well established. At locations near the substrate in both conditions, microtexturing is weak, but EB DED builds exhibit a strong microtexture and pronounced variant selection with increasing build height. On the other hand, the laser DED builds displayed weak texturing and no prominent variant selection across all heights. With the addition of HIP post processing, there was no change in microtexturing of the coarsened α laths for both the laser and EB structures, and the same variant selection observed in the as-deposited EB DED builds was present.

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