Post-processing to Modify the α Phase Micro-Texture and β Phase Grain Morphology in Ti-6Al-4V Fabricated by Powder Bed Electron Beam Melting

Peeyush Nandwana; Yousub Lee; Chasen Ranger; Anthony D. Rollett; Ryan R. Dehoff; Sudarsanam S. Babu

doi:10.1007/s11661-019-05247-4

Post-processing to Modify the α Phase Micro-Texture and β Phase Grain Morphology in Ti-6Al-4V Fabricated by Powder Bed Electron Beam Melting

Peeyush Nandwana, Yousub Lee, Chasen Ranger, Anthony D. Rollett, Ryan R. Dehoff, Sudarsanam S. Babu

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

Abstract

Additively manufactured Ti-6Al-4V has columnar β grains along the build direction with a 〈001〉 fiber texture. Because of Burgers Orientation Relationship, the resulting α phase becomes textured albeit less strongly than the β phase. Microtexture zones have been identified in the α phase in laser-based systems. There have been limited studies on α phase texture and its impact on mechanical behavior of Ti-6Al-4V fabricated via electron beam melting (EBM) powder bed additive manufacturing along with the use of super-transus heat treatments to modify the resulting α phase texture. We present the role of texture on influencing the tensile behavior of EBM Ti-6Al-4V. We observed that super-transus heat treatment of the alloy also results in columnar to equiaxed transition of β grains with a subsequent change in α phase texture. Potential mechanisms for the formation of equiaxed β are discussed.

Original language	English
Pages (from-to)	3429-3439
Number of pages	11
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	50
Issue number	7
DOIs	https://doi.org/10.1007/s11661-019-05247-4
State	Published - Jul 15 2019

Funding

Research was sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office, under Contract DE-AC05-00OR22725 with UT-Battelle, LLC. This research at the Oak Ridge National Laboratory¢s High Temperature Materials Laboratory was sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Program. CR and ADR acknowledge support from the Department of Energy, National Nuclear Security Administration under Grant No. DE-NA0002918. Research was sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office, under Contract DE-AC05-00OR22725 with UT-Battelle, LLC. This research at the Oak Ridge National Laboratory?s High Temperature Materials Laboratory was sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Program. CR and ADR acknowledge support from the Department of Energy, National Nuclear Security Administration under Grant No. DE-NA0002918.

Funders	Funder number
U.S. Department of Energy
Office of Energy Efficiency and Renewable Energy	DE-AC05-00OR22725 with UT-Battelle
National Nuclear Security Administration	DE-NA0002918
Vehicle Technologies Program
Oak Ridge National Laboratory

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1007/s11661-019-05247-4

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Nandwana, P., Lee, Y., Ranger, C., Rollett, A. D., Dehoff, R. R., & Babu, S. S. (2019). Post-processing to Modify the α Phase Micro-Texture and β Phase Grain Morphology in Ti-6Al-4V Fabricated by Powder Bed Electron Beam Melting. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 50(7), 3429-3439. https://doi.org/10.1007/s11661-019-05247-4

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title = "Post-processing to Modify the α Phase Micro-Texture and β Phase Grain Morphology in Ti-6Al-4V Fabricated by Powder Bed Electron Beam Melting",

abstract = "Additively manufactured Ti-6Al-4V has columnar β grains along the build direction with a 〈001〉 fiber texture. Because of Burgers Orientation Relationship, the resulting α phase becomes textured albeit less strongly than the β phase. Microtexture zones have been identified in the α phase in laser-based systems. There have been limited studies on α phase texture and its impact on mechanical behavior of Ti-6Al-4V fabricated via electron beam melting (EBM) powder bed additive manufacturing along with the use of super-transus heat treatments to modify the resulting α phase texture. We present the role of texture on influencing the tensile behavior of EBM Ti-6Al-4V. We observed that super-transus heat treatment of the alloy also results in columnar to equiaxed transition of β grains with a subsequent change in α phase texture. Potential mechanisms for the formation of equiaxed β are discussed.",

author = "Peeyush Nandwana and Yousub Lee and Chasen Ranger and Rollett, {Anthony D.} and Dehoff, {Ryan R.} and Babu, {Sudarsanam S.}",

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Nandwana, P , Lee, Y, Ranger, C, Rollett, AD, Dehoff, RR & Babu, SS 2019, 'Post-processing to Modify the α Phase Micro-Texture and β Phase Grain Morphology in Ti-6Al-4V Fabricated by Powder Bed Electron Beam Melting', Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, vol. 50, no. 7, pp. 3429-3439. https://doi.org/10.1007/s11661-019-05247-4

Post-processing to Modify the α Phase Micro-Texture and β Phase Grain Morphology in Ti-6Al-4V Fabricated by Powder Bed Electron Beam Melting. / Nandwana, Peeyush ; Lee, Yousub; Ranger, Chasen et al.
In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 50, No. 7, 15.07.2019, p. 3429-3439.

Research output: Contribution to journal › Article › peer-review

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T1 - Post-processing to Modify the α Phase Micro-Texture and β Phase Grain Morphology in Ti-6Al-4V Fabricated by Powder Bed Electron Beam Melting

AU - Nandwana, Peeyush

AU - Lee, Yousub

AU - Ranger, Chasen

AU - Rollett, Anthony D.

AU - Dehoff, Ryan R.

AU - Babu, Sudarsanam S.

N1 - Publisher Copyright: © 2019, This is a U.S. government work and its text is not subject to copyright protection in the United States; however, its text may be subject to foreign copyright protection.

PY - 2019/7/15

Y1 - 2019/7/15

N2 - Additively manufactured Ti-6Al-4V has columnar β grains along the build direction with a 〈001〉 fiber texture. Because of Burgers Orientation Relationship, the resulting α phase becomes textured albeit less strongly than the β phase. Microtexture zones have been identified in the α phase in laser-based systems. There have been limited studies on α phase texture and its impact on mechanical behavior of Ti-6Al-4V fabricated via electron beam melting (EBM) powder bed additive manufacturing along with the use of super-transus heat treatments to modify the resulting α phase texture. We present the role of texture on influencing the tensile behavior of EBM Ti-6Al-4V. We observed that super-transus heat treatment of the alloy also results in columnar to equiaxed transition of β grains with a subsequent change in α phase texture. Potential mechanisms for the formation of equiaxed β are discussed.

AB - Additively manufactured Ti-6Al-4V has columnar β grains along the build direction with a 〈001〉 fiber texture. Because of Burgers Orientation Relationship, the resulting α phase becomes textured albeit less strongly than the β phase. Microtexture zones have been identified in the α phase in laser-based systems. There have been limited studies on α phase texture and its impact on mechanical behavior of Ti-6Al-4V fabricated via electron beam melting (EBM) powder bed additive manufacturing along with the use of super-transus heat treatments to modify the resulting α phase texture. We present the role of texture on influencing the tensile behavior of EBM Ti-6Al-4V. We observed that super-transus heat treatment of the alloy also results in columnar to equiaxed transition of β grains with a subsequent change in α phase texture. Potential mechanisms for the formation of equiaxed β are discussed.

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IS - 7

ER -

Post-processing to Modify the α Phase Micro-Texture and β Phase Grain Morphology in Ti-6Al-4V Fabricated by Powder Bed Electron Beam Melting

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