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; Rollett, Anthony D.; Dehoff, Ryan R.; Babu, Sudarsanam S.

doi:10.1007/s11661-019-05247-4

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

Journal Article · Mon May 13 00:00:00 EDT 2019 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-019-05247-4· OSTI ID:1546541

^[1];

^[1]; Ranger, Chasen ^[2]; Rollett, Anthony D. ^[2];

^[1]; Babu, Sudarsanam S. ^[3]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Carnegie Mellon Univ., Pittsburgh, PA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Additively manufactured Ti-6Al-₄V has columnar β grains along the build direction with a ⟨001⟩ fiber texture. Due to 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. Possible mechanisms for the formation of equiaxed β are reported on.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1546541

Journal Information:: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 50, Issue 7; ISSN 1073-5623

Publisher:: ASM InternationalCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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Deformation-free geometric recrystallisation in a metastable β-Ti alloy produced by selective laser melting Zafari, Ahmad; Lui, Edward W.; Xia, Kenong Taylor & Francis https://doi.org/10.6084/m9.figshare.11590257.v1	text	January 2020

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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

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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