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Title: Texture Evolution During Laser Direct Metal Deposition of Ti-6Al-4V

Journal Article · · JOM. Journal of the Minerals, Metals & Materials Society
 [1];  [2];  [3];  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Mechanical, Aerospace, and Biomedical Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Applied Optimization, Dayton, OH (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
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Titanium alloys are used in a wide variety of high performance applications and hence the processing of the titanium and the resulting microstructures after additive manufacturing has received significant attention. During additive manufacturing the processing route involves the transition from a liquid to solid state. The addition of successive layers results in a complex microstructure due to solid-state transformations. The current study focuses on understanding the phase transformations and relate it to the transformation texture in Ti-6Al-4V to identify conditions leading to a strong alpha transformation texture. The as deposited builds were characterized using optical microscopy and electron backscattered diffraction. The results showed columnar prior β grains with a martensitic structure after the deposition of a single layer. On subsequent depositions the martensitic microstructure decomposes to a colony and basketweave microstructure with a stronger transformation texture. The alpha texture with a colony and basketweave microstructure shows a stronger transformation texture as a result of variant selection. Thus by controlling the cooling rate of the build from the β transus it is possible to control the alpha transformation texture.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Temperature Materials Lab. (HTML); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Manufacturing Demonstration Facility (MDF)
Sponsoring Organization:
USDOE; Work for Others (WFO)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1302938
Journal Information:
JOM. Journal of the Minerals, Metals & Materials Society, Vol. 68, Issue 3; ISSN 1047-4838
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 48 works
Citation information provided by
Web of Science

References (16)

In situ observation of texture evolution during α→β and β→α phase transformations in titanium alloys investigated by neutron diffraction journal October 2007
The effects of texture in titanium alloys for engineering components under fatigue journal January 2001
Texture and Crystal Orientation in Ti-6Al-4V Builds Fabricated by Shaped Metal Deposition journal June 2010
The role of crystallographic and geometrical relationships between α and β phases in an α/β titanium alloy journal September 2003
Effect of β grain growth on variant selection and texture memory effect during α→β→α phase transformation in Ti–6 Al–4 V journal February 2012
Variant selection and intervariant crystallographic planes distribution in martensite in a Ti–6Al–4V alloy journal November 2014
Effect of self-accommodation on α/α boundary populations in pure titanium journal May 2003
Selection of α variants during microstructural evolution in α/β titanium alloys journal August 2007
In situ neutron diffraction study of texture evolution and variant selection during the α→β→α phase transformation in Ti–6Al–4V journal December 2012
The Origin of Microstructural Diversity, Texture, and Mechanical Properties in Electron Beam Melted Ti-6Al-4V journal August 2010
Effect of Wall Thickness Transitions on Texture and Grain Structure in Additive Layer Manufacture (ALM) of Ti-6Al-4V journal January 2012
Thermal process maps for predicting solidification microstructure in laser fabrication of thin-wall structures journal September 2006
The influence of rolling temperature on texture evolution and variant selection during α→β→α phase transformation in Ti–6Al–4V journal October 2012
A study of the microstructural evolution during selective laser melting of Ti–6Al–4V journal May 2010
Crystallographic variant selection in Ti–6Al–4V journal October 2004
On the Texture Formation of Selective Laser Melted Ti-6Al-4V journal February 2014

Cited By (9)

On the potential mechanisms of β to α′ + β decomposition in two phase titanium alloys during additive manufacturing: a combined transmission Kikuchi diffraction and 3D atom probe study journal September 2019
Post-processing to Modify the α Phase Micro-Texture and β Phase Grain Morphology in Ti-6Al-4V Fabricated by Powder Bed Electron Beam Melting journal May 2019
Experimental and computational appraisal of the shape accuracy of a thin-walled virole aero-engine casing manufactured by means of laser metal deposition journal June 2017
Microstructure and property of laser additive manufactured alloy Ti–6Al–2V–1.5Mo–0.5Zr–0.3Si after aged at different temperatures journal January 2019
Microstructure characterisation of Ti-6Al-4V from different additive manufacturing processes journal October 2017
Laser Metal Deposition of Ti6Al4V—A Brief Review journal January 2020
Effect of Interlayer Cooling Time, Constraint and Tool Path Strategy on Deformation of Large Components Made by Laser Metal Deposition with Wire journal November 2019
Additive manufacturing of titanium alloys in the biomedical field: processes, properties and applications journal August 2017
Laser Metal Deposition of Ti6Al4V : A Brief Review text January 2020

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