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Title: 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

Abstract

In this paper, we focus on the mechanisms of phase transformations in additively manufactured Ti–6Al–4V during cooling. In particular, the goal is to understand if the imposed thermal cycles during fabrication results in the complete transformation of the α' to the β phase or the sub-transus decomposition of α' (martensite) to α + β. To this effect, samples fabricated using electron beam melting and laser-directed energy deposition techniques were analyzed using atom probe tomography (APT) in conjunction with correlative transmission Kikuchi diffraction (TKD). While the composition measurement using APT shows partitioning of vanadium into the β phase, the crystallographic analysis suggests evidence of a shear-induced transformation. Despite the pronounced differences in the processing conditions, both of the additive manufacturing techniques lead to similar partitioning of vanadium to the β phase. Finally, calculations using THERMOCALC and DICTRA show that under the time and temperature regimes of additive manufacturing the microstructure could develop by the decomposition reaction of α' → α+β.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [2];  [2];  [4]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  2. CAMECA Instrument, Inc., Madison, WI (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office
OSTI Identifier:
1607175
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Science
Additional Journal Information:
Journal Volume: 55; Journal Issue: 4; Journal ID: ISSN 0022-2461
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Sridharan, Niyanth, Chen, Yimeng, Nandwana, Peeyush, Ulfig, Robert M., Larson, David J., and Babu, Sudarsanam. 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. United States: N. p., 2019. Web. https://doi.org/10.1007/s10853-019-03984-w.
Sridharan, Niyanth, Chen, Yimeng, Nandwana, Peeyush, Ulfig, Robert M., Larson, David J., & Babu, Sudarsanam. 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. United States. https://doi.org/10.1007/s10853-019-03984-w
Sridharan, Niyanth, Chen, Yimeng, Nandwana, Peeyush, Ulfig, Robert M., Larson, David J., and Babu, Sudarsanam. Fri . "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". United States. https://doi.org/10.1007/s10853-019-03984-w. https://www.osti.gov/servlets/purl/1607175.
@article{osti_1607175,
title = {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},
author = {Sridharan, Niyanth and Chen, Yimeng and Nandwana, Peeyush and Ulfig, Robert M. and Larson, David J. and Babu, Sudarsanam},
abstractNote = {In this paper, we focus on the mechanisms of phase transformations in additively manufactured Ti–6Al–4V during cooling. In particular, the goal is to understand if the imposed thermal cycles during fabrication results in the complete transformation of the α' to the β phase or the sub-transus decomposition of α' (martensite) to α + β. To this effect, samples fabricated using electron beam melting and laser-directed energy deposition techniques were analyzed using atom probe tomography (APT) in conjunction with correlative transmission Kikuchi diffraction (TKD). While the composition measurement using APT shows partitioning of vanadium into the β phase, the crystallographic analysis suggests evidence of a shear-induced transformation. Despite the pronounced differences in the processing conditions, both of the additive manufacturing techniques lead to similar partitioning of vanadium to the β phase. Finally, calculations using THERMOCALC and DICTRA show that under the time and temperature regimes of additive manufacturing the microstructure could develop by the decomposition reaction of α' → α+β.},
doi = {10.1007/s10853-019-03984-w},
journal = {Journal of Materials Science},
number = 4,
volume = 55,
place = {United States},
year = {2019},
month = {9}
}

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