Revealing competitive columnar grain growth behavior and periodic microstructural banding in additively manufactured Ti-6Al-4 V parts by selective electron beam melting

Powder-bed fusion additive manufacturing of Ti-6Al-4 V has been of tremendous interest in both academia and industry. As the two ubiquitous microstructural features, columnar grain and microstructural banding in selective electron beam melting of Ti-6Al-4 V are systematically studied by experimental...

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Main Authors: Tan, Xi Peng, Chandra, Shubham, Kok, Yihong, Tor, Shu Beng, Seet, Gerald Gim Lee, Loh, Ngiap Hiang, Liu, Erjia
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/140228
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1402282020-09-26T22:06:35Z Revealing competitive columnar grain growth behavior and periodic microstructural banding in additively manufactured Ti-6Al-4 V parts by selective electron beam melting Tan, Xi Peng Chandra, Shubham Kok, Yihong Tor, Shu Beng Seet, Gerald Gim Lee Loh, Ngiap Hiang Liu, Erjia School of Mechanical and Aerospace Engineering Singapore Centre for 3D Printing Engineering::Materials::Material testing and characterization Additive Manufacturing Electron Beam Melting Powder-bed fusion additive manufacturing of Ti-6Al-4 V has been of tremendous interest in both academia and industry. As the two ubiquitous microstructural features, columnar grain and microstructural banding in selective electron beam melting of Ti-6Al-4 V are systematically studied by experimental and simulation methods. Three basic build geometries (i.e. V-, I- and A-shaped parts) are employed to study the columnar grain growth behavior. We find that columnar prior β-Ti grains grow epitaxially and competitively by following the classic competitive grain growth model in additive manufacturing of Ti-6Al-4 V. It results in increasingly stronger crystallographic texture with the rising build height. We also observe the consistently occurring microstructural banding (∼100 µm in period) normal to build direction due to the overlapped heat affected zones that are formed in the layerwise thermal cyclic process. In addition, a large quantity of sub-columnar grains exist within the microstructure for selective electron beam melted Ti-6Al-4 V. It is demonstrated that the periodic microstructural banding determines the appearance of sub-columnar grains which may affect the competition behavior for the growth of columnar grains. NRF (Natl Research Foundation, S’pore) Accepted version 2020-05-27T07:45:48Z 2020-05-27T07:45:48Z 2019 Journal Article Tan, X. P., Chandra, S., Kok, Y., Tor, S. B., Seet, G., Loh, N. H., & Liu, E. (2019). Revealing competitive columnar grain growth behavior and periodic microstructural banding in additively manufactured Ti-6Al-4 V parts by selective electron beam melting. Materialia, 7, 100365-. doi:10.1016/j.mtla.2019.100365 2589-1529 https://hdl.handle.net/10356/140228 10.1016/j.mtla.2019.100365 2-s2.0-85066612644 7 en Materialia © 2019 Acta Materialia Inc. All rights reserved. This paper was published by Elsevier Ltd in Materialia and is made available with permission of Acta Materialia Inc. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Engineering::Materials::Material testing and characterization
Additive Manufacturing
Electron Beam Melting
spellingShingle Engineering::Materials::Material testing and characterization
Additive Manufacturing
Electron Beam Melting
Tan, Xi Peng
Chandra, Shubham
Kok, Yihong
Tor, Shu Beng
Seet, Gerald Gim Lee
Loh, Ngiap Hiang
Liu, Erjia
Revealing competitive columnar grain growth behavior and periodic microstructural banding in additively manufactured Ti-6Al-4 V parts by selective electron beam melting
description Powder-bed fusion additive manufacturing of Ti-6Al-4 V has been of tremendous interest in both academia and industry. As the two ubiquitous microstructural features, columnar grain and microstructural banding in selective electron beam melting of Ti-6Al-4 V are systematically studied by experimental and simulation methods. Three basic build geometries (i.e. V-, I- and A-shaped parts) are employed to study the columnar grain growth behavior. We find that columnar prior β-Ti grains grow epitaxially and competitively by following the classic competitive grain growth model in additive manufacturing of Ti-6Al-4 V. It results in increasingly stronger crystallographic texture with the rising build height. We also observe the consistently occurring microstructural banding (∼100 µm in period) normal to build direction due to the overlapped heat affected zones that are formed in the layerwise thermal cyclic process. In addition, a large quantity of sub-columnar grains exist within the microstructure for selective electron beam melted Ti-6Al-4 V. It is demonstrated that the periodic microstructural banding determines the appearance of sub-columnar grains which may affect the competition behavior for the growth of columnar grains.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Tan, Xi Peng
Chandra, Shubham
Kok, Yihong
Tor, Shu Beng
Seet, Gerald Gim Lee
Loh, Ngiap Hiang
Liu, Erjia
format Article
author Tan, Xi Peng
Chandra, Shubham
Kok, Yihong
Tor, Shu Beng
Seet, Gerald Gim Lee
Loh, Ngiap Hiang
Liu, Erjia
author_sort Tan, Xi Peng
title Revealing competitive columnar grain growth behavior and periodic microstructural banding in additively manufactured Ti-6Al-4 V parts by selective electron beam melting
title_short Revealing competitive columnar grain growth behavior and periodic microstructural banding in additively manufactured Ti-6Al-4 V parts by selective electron beam melting
title_full Revealing competitive columnar grain growth behavior and periodic microstructural banding in additively manufactured Ti-6Al-4 V parts by selective electron beam melting
title_fullStr Revealing competitive columnar grain growth behavior and periodic microstructural banding in additively manufactured Ti-6Al-4 V parts by selective electron beam melting
title_full_unstemmed Revealing competitive columnar grain growth behavior and periodic microstructural banding in additively manufactured Ti-6Al-4 V parts by selective electron beam melting
title_sort revealing competitive columnar grain growth behavior and periodic microstructural banding in additively manufactured ti-6al-4 v parts by selective electron beam melting
publishDate 2020
url https://hdl.handle.net/10356/140228
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