Fernández Silva, B. orcid.org/0000-0003-2288-9675, Jackson, M. orcid.org/0000-0002-9553-1239, Fox, K. et al. (1 more author) (2023) Tool for automatic macrozone characterization from EBSD data sets of titanium alloys. Journal of Applied Crystallography, 56 (3). pp. 737-749. ISSN 0021-8898
Abstract
Microtexture heterogeneities are commonly found in titanium forgings because of the thermomechanical processing. Also known as macrozones, these regions can reach millimetres in length, with grains sharing a similar crystallographic orientation leading to less resistance to crack propagation. Since the link between macrozones and the reduction of cold-dwell-fatigue performance on rotative components in gas turbine engines was established, efforts have been put into macrozone definition and characterization. The electron backscatter diffraction (EBSD) technique, widely used for texture analysis, allows for a qualitative macrozone characterization; however, further processing is required to define the boundaries and disorientation spread of each macrozone. Current approaches often use c-axis misorientation criteria, but this can sometimes lead to a large disorientation spread within a macrozone. This article describes the development and application of a computational tool implemented in MATLAB for automatic macrozone identification from EBSD data sets on the basis of a more conservative approach where both the c-axis tilting and rotation are considered. The tool allows for detection of macrozones according to the disorientation angle and density-fraction criteria. The clustering efficiency is validated by pole-figure plots, and the effects of the key parameters defining the macrozone clustering (disorientation and fraction) are discussed. In addition, this tool was successfully applied to both fully equiaxed and bimodal microstructures of titanium forgings.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023 The Authors. This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
Keywords: | macrozones; electron backscatter diffraction; titanium alloys; texture; characterization; crystal misorientation criteria. |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Funding Information: | Funder Grant number Engineering and Physical Sciences Research Council EP/L016273/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 05 Jun 2023 15:21 |
Last Modified: | 05 Jun 2023 15:21 |
Published Version: | http://dx.doi.org/10.1107/s1600576723003862 |
Status: | Published |
Publisher: | International Union of Crystallography (IUCr) |
Refereed: | Yes |
Identification Number: | 10.1107/s1600576723003862 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:199737 |