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

Kumar, Sabina; Kamath, Rakesh Rajaram; Nandwana, Peeyush; Chen, Yan; Babu, Suresh

doi:10.1016/j.mtla.2020.100883

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

Journal Article · 29 August 2020 · Materialia

DOI: https://doi.org/10.1016/j.mtla.2020.100883 · OSTI ID:1659619

Kumar, Sabina ^[1]; Kamath, Rakesh Rajaram ^[1];

^[2];

^[3]; Babu, Suresh ^[4]

Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Manufacturing Demonstration Facility (MDF)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Manufacturing Demonstration Facility (MDF)

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: 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)

Grant/Contract Number:: AC05-00OR22725; N00014-18-1-2794

OSTI ID:: 1659619

Alternate ID(s):: OSTI ID: 1657634

Journal Information:: Materialia, Vol. 14; ISSN 2589-1529

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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