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Hydrogen-Aided Microstructural Engineering of Additively Manufactured Ti–6Al–4V
Abstract
Electron beam melting (EBM) additive manufacturing of Ti–6Al–4V subjects the material to complex thermal cycles, resulting in a columnar morphology of the prior β grains (PBGs). While the columnar PBGs of EBM-processed Ti–6Al–4V can be transformed to an equiaxed morphology through a super-transus (i.e., above the β-transus temperature) heat treatment, this also leads to the formation of a coarse lamellar two-phase microstructure. Such a microstructure is prone to strain localization and premature fracture. In this study, we present a thermohydrogen post-process treatment that achieves equiaxed PBG morphology in EBM-processed Ti–6Al–4V without sacrificing mechanical properties. Our results show that a three-step thermohydrogen post-process treatment can transform the columnar PBG morphology to an equiaxed morphology with fine microstructure, and strength and ductility levels comparable to those of the most optimum as-fabricated samples. This three-step thermohydrogen post-process treatment involves hydrogenation and phase transformation treatment in a hydrogen atmosphere, and subsequent dehydrogenation treatment in vacuum. Notably, all these treatments are carried out at temperatures well below the β-transus temperature of hydrogen-free Ti–6Al–4V.
- Authors:
-
[3];
- Texas A & M Univ., College Station, TX (United States)
- Texas A & M Univ., College Station, TX (United States); DEVCOM Army Research Laboratory, College Station, TX (United States)
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE); US Army Research Laboratory (USARL); National Science Foundation (NSF)
- OSTI Identifier:
- 2007704
- Grant/Contract Number:
- AC05-00OR22725; CMMI-1944496
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science
- Additional Journal Information:
- Journal Volume: 54; Journal ID: ISSN 1073-5615
- Publisher:
- ASM International
- Country of Publication:
- United States
- Language:
- English
- Subject:
- characterization; tensile testing; additive manufacturing; titanium alloys; phase transformation; hydrogen processing
Citation Formats
Draelos-Hagerty, Lara, Paramore, James D., Butler, Brady G., Nandwana, Peeyush, and Srivastava, Ankit. Hydrogen-Aided Microstructural Engineering of Additively Manufactured Ti–6Al–4V. United States: N. p., 2023.
Web. doi:10.1007/s11663-023-02924-z.
Draelos-Hagerty, Lara, Paramore, James D., Butler, Brady G., Nandwana, Peeyush, & Srivastava, Ankit. Hydrogen-Aided Microstructural Engineering of Additively Manufactured Ti–6Al–4V. United States. https://doi.org/10.1007/s11663-023-02924-z
Draelos-Hagerty, Lara, Paramore, James D., Butler, Brady G., Nandwana, Peeyush, and Srivastava, Ankit. Fri .
"Hydrogen-Aided Microstructural Engineering of Additively Manufactured Ti–6Al–4V". United States. https://doi.org/10.1007/s11663-023-02924-z.
@article{osti_2007704,
title = {Hydrogen-Aided Microstructural Engineering of Additively Manufactured Ti–6Al–4V},
author = {Draelos-Hagerty, Lara and Paramore, James D. and Butler, Brady G. and Nandwana, Peeyush and Srivastava, Ankit},
abstractNote = {Electron beam melting (EBM) additive manufacturing of Ti–6Al–4V subjects the material to complex thermal cycles, resulting in a columnar morphology of the prior β grains (PBGs). While the columnar PBGs of EBM-processed Ti–6Al–4V can be transformed to an equiaxed morphology through a super-transus (i.e., above the β-transus temperature) heat treatment, this also leads to the formation of a coarse lamellar two-phase microstructure. Such a microstructure is prone to strain localization and premature fracture. In this study, we present a thermohydrogen post-process treatment that achieves equiaxed PBG morphology in EBM-processed Ti–6Al–4V without sacrificing mechanical properties. Our results show that a three-step thermohydrogen post-process treatment can transform the columnar PBG morphology to an equiaxed morphology with fine microstructure, and strength and ductility levels comparable to those of the most optimum as-fabricated samples. This three-step thermohydrogen post-process treatment involves hydrogenation and phase transformation treatment in a hydrogen atmosphere, and subsequent dehydrogenation treatment in vacuum. Notably, all these treatments are carried out at temperatures well below the β-transus temperature of hydrogen-free Ti–6Al–4V.},
doi = {10.1007/s11663-023-02924-z},
journal = {Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science},
number = ,
volume = 54,
place = {United States},
year = {Fri Sep 29 00:00:00 EDT 2023},
month = {Fri Sep 29 00:00:00 EDT 2023}
}
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