Hydrogen-Aided Microstructural Engineering of Additively Manufactured Ti–6Al–4V

Draelos-Hagerty, Lara; Paramore, James D.; Butler, Brady G.; Nandwana, Peeyush; Srivastava, Ankit

doi:10.1007/s11663-023-02924-z

Title: Hydrogen-Aided Microstructural Engineering of Additively Manufactured Ti–6Al–4V

Journal Article · Fri Sep 29 00:00:00 EDT 2023 · Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science

DOI:https://doi.org/10.1007/s11663-023-02924-z· OSTI ID:2007704

Draelos-Hagerty, Lara ^[1]; Paramore, James D. ^[2]; Butler, Brady G. ^[2];

^[3]; Srivastava, Ankit ^[1]

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)

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.

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

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); US Army Research Laboratory (USARL); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; CMMI-1944496

OSTI ID:: 2007704

Journal Information:: Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science, Vol. 54; ISSN 1073-5615

Publisher:: ASM InternationalCopyright Statement

Country of Publication:: United States

Language:: English

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