Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/140228
Title: Revealing competitive columnar grain growth behavior and periodic microstructural banding in additively manufactured Ti-6Al-4 V parts by selective electron beam melting
Authors: Tan, Xi Peng
Chandra, Shubham
Kok, Yihong
Tor, Shu Beng
Seet, Gerald Gim Lee
Loh, Ngiap Hiang
Liu, Erjia
Keywords: Engineering::Materials::Material testing and characterization
Issue Date: 2019
Source: 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
Journal: Materialia
Abstract: 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.
URI: https://hdl.handle.net/10356/140228
ISSN: 2589-1529
DOI: 10.1016/j.mtla.2019.100365
Rights: © 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.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SC3DP Journal Articles

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