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Title: Dynamic phase transformations in additively manufactured Ti-6Al-4V during thermo-mechanical gyrations

Abstract

A complex interaction of process parameters, geometry and scan strategies in Additive Manufacturing (AM), can bring about spatial and temporal transients, i.e., Σ T (x, y, z, time), within a part. Published literature focusses on fluctuating thermal cycles on the microstructure evolution. However, the microstructural variations have not been correlated to dynamic flow behavior due to the macro- and micro-scale phenomena, i.e., accumulated plastic strains brought about by large thermal gradients, transformational strains and crystallographic misfit strains. Therefore, here we studied the mechanical response of Ti6Al4V alloys produced by AM under externally imposed controlled thermo-mechanical reversals in a Gleeble® thermo-mechanical simulator. The stress-strain behaviors were correlated to phase fractions, lattice strains, and also limited information on crystallographic texture using neutron diffraction techniques at the VULCAN Beamline at SNS, ORNL and also metallographic studies. The results are discussed and rationalized based on theories of static and dynamic phase transformations.

Authors:
 [1];  [1]; ORCiD logo [2]; ORCiD logo [3];  [4]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Manufacturing Demonstration Facility (MDF)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
  4. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Manufacturing Demonstration Facility (MDF)
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; US Department of the Navy, Office of Naval Research (ONR)
OSTI Identifier:
1659619
Alternate Identifier(s):
OSTI ID: 1657634
Grant/Contract Number:  
AC05-00OR22725; N00014-18-1-2794
Resource Type:
Accepted Manuscript
Journal Name:
Materialia
Additional Journal Information:
Journal Volume: 14; Journal ID: ISSN 2589-1529
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; α/β titanium alloy; additive manufacturing; cyclic thermo-mechanical reversals; E-PBF system; hysteresis stress-strain plots; neutron diffraction analysis

Citation Formats

Kumar, Sabina, Kamath, Rakesh Rajaram, Nandwana, Peeyush, Chen, Yan, and Babu, Suresh. Dynamic phase transformations in additively manufactured Ti-6Al-4V during thermo-mechanical gyrations. United States: N. p., 2020. Web. https://doi.org/10.1016/j.mtla.2020.100883.
Kumar, Sabina, Kamath, Rakesh Rajaram, Nandwana, Peeyush, Chen, Yan, & Babu, Suresh. Dynamic phase transformations in additively manufactured Ti-6Al-4V during thermo-mechanical gyrations. United States. https://doi.org/10.1016/j.mtla.2020.100883
Kumar, Sabina, Kamath, Rakesh Rajaram, Nandwana, Peeyush, Chen, Yan, and Babu, Suresh. Sat . "Dynamic phase transformations in additively manufactured Ti-6Al-4V during thermo-mechanical gyrations". United States. https://doi.org/10.1016/j.mtla.2020.100883.
@article{osti_1659619,
title = {Dynamic phase transformations in additively manufactured Ti-6Al-4V during thermo-mechanical gyrations},
author = {Kumar, Sabina and Kamath, Rakesh Rajaram and Nandwana, Peeyush and Chen, Yan and Babu, Suresh},
abstractNote = {A complex interaction of process parameters, geometry and scan strategies in Additive Manufacturing (AM), can bring about spatial and temporal transients, i.e., Σ T (x, y, z, time), within a part. Published literature focusses on fluctuating thermal cycles on the microstructure evolution. However, the microstructural variations have not been correlated to dynamic flow behavior due to the macro- and micro-scale phenomena, i.e., accumulated plastic strains brought about by large thermal gradients, transformational strains and crystallographic misfit strains. Therefore, here we studied the mechanical response of Ti6Al4V alloys produced by AM under externally imposed controlled thermo-mechanical reversals in a Gleeble® thermo-mechanical simulator. The stress-strain behaviors were correlated to phase fractions, lattice strains, and also limited information on crystallographic texture using neutron diffraction techniques at the VULCAN Beamline at SNS, ORNL and also metallographic studies. The results are discussed and rationalized based on theories of static and dynamic phase transformations.},
doi = {10.1016/j.mtla.2020.100883},
journal = {Materialia},
number = ,
volume = 14,
place = {United States},
year = {2020},
month = {8}
}

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This content will become publicly available on August 29, 2021
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