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In-Situ Synchrotron X-Ray Diffraction of Ti-6Al-4V During Thermomechanical Treatment in the Beta Field

1
Institute of Materials Science, Joining and Forming, Graz University of Technology, A-8010 Graz, Austria
2
Nuclear Physics Institute ASCR, CZ-25068 Řež near Prague, Czech Republic
3
Institute of Food Technology, University of Natural Resources and Life Sciences, A-1180 Vienna, Austria
4
Institute of Materials Science, German Aerospace Center (DLR), D-51147 Cologne, Germany
5
Metallic Structures and Materials Systems for Aerospace Engineering, Institute of Metal Forming, RWTH Aachen University, D-52062 Aachen, Germany
6
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, D-21502 Geesthacht, Germany
7
Christian Doppler Laboratory for Design of High-Performance Alloys by Thermomechanical Processing, A-8010 Graz, Austria
*
Author to whom correspondence should be addressed.
Metals 2019, 9(8), 862; https://doi.org/10.3390/met9080862
Received: 25 June 2019 / Revised: 26 July 2019 / Accepted: 31 July 2019 / Published: 7 August 2019
(This article belongs to the Special Issue The Behaviours of Alloys under Thermo-Mechanical Treatment)
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Abstract

This work aims to identify the mechanisms of restoration occurring in Ti-6Al-4V during hot plastic deformation and subsequent heat treatment. The allotropic phase transformation that occurs during cooling distorts the interpretation of the restoration mechanisms taking place at high temperatures. Therefore, analysis of deformed samples by conventional microscopy have led to controversies in the interpretation of the main dynamic restoration mechanism. Additionally, static restoration of the microstructure can occur during slow cooling, modifying the microstructure. These facts were mainly the reasons why discontinuous dynamic recrystallization and/or dynamic recovery has been reported as the main dynamic restoration mechanism for Ti-6Al-4V. In this work, we use in-situ synchrotron X-ray diffraction combined with conventional microscopy to determine the dynamic and static mechanisms of restoration during and after deformation at different strain rates. The results show dynamic recovery as main mechanism of restoration during deformation in the β field, denoted by sub-grain formation and a misorientation dependency of the strain rate. After deformation, static recrystallization, grain growth, and coarsening of the β grains can be observed, especially at strain rates higher than 0.1 s−1. It is also demonstrated that the nucleation of new grains can occur within the very first seconds of the isothermal heat treatment. View Full-Text
Keywords: Ti-6Al-4V; hot deformation; heat treatment; in-situ high energy X-ray diffraction; microstructure; recrystallization Ti-6Al-4V; hot deformation; heat treatment; in-situ high energy X-ray diffraction; microstructure; recrystallization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Warchomicka, F.; Canelo-Yubero, D.; Zehetner, E.; Requena, G.; Stark, A.; Poletti, C. In-Situ Synchrotron X-Ray Diffraction of Ti-6Al-4V During Thermomechanical Treatment in the Beta Field. Metals 2019, 9, 862.

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