Mechanical Behavior Assessment of Ti-6Al-4V ELI Alloy Produced by Laser Powder Bed Fusion

Mahmud, Asif; Huynh, Thinh; Zhou, Le; Hyer, Holden; Mehta, Abhishek; Imholte, Daniel D.; Woolstenhulme, Nicolas E.; Wachs, Daniel M.; Sohn, Yongho

doi:10.3390/met11111671

Title: Mechanical Behavior Assessment of Ti-6Al-4V ELI Alloy Produced by Laser Powder Bed Fusion

Journal Article · Wed Oct 20 00:00:00 EDT 2021 · Metals

DOI:https://doi.org/10.3390/met11111671· OSTI ID:1897056

^[1];

^[1]; Zhou, Le ^[2];

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^[4];

^[4]; Wachs, Daniel M. ^[4]; Sohn, Yongho ^[1]

Univ. of Central Florida, Orlando, FL (United States)
Univ. of Central Florida, Orlando, FL (United States); Marquette Univ., Milwaukee, WI (United States)
Univ. of Central Florida, Orlando, FL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Idaho National Lab. (INL), Idaho Falls, ID (United States)

The present work correlates the quasi-static, tensile mechanical properties of additively manufactured Ti-6Al-4V extra low interstitial (ELI, Grade 23) alloy to the phase constituents, microstructure, and fracture surface characteristics that changed with post-heat treatment of stress relief (670 °C for 5 h) and hot isostatic pressing (HIP with 100 MPa at 920 °C for 2 h under an Ar atmosphere). Ti-6Al-4V ELI alloy tensile specimens in both the horizontal (i.e., X and Y) and vertical (Z) directions were produced by the laser powder bed fusion (LPBF) technique. Higher yield strength (1141 MPa), higher tensile strength (1190 MPa), but lower elongation at fracture (6.9%), along with mechanical anisotropy were observed for as-stress-relieved (ASR) samples. However, after HIP, consistent and isotropic mechanical behaviors were observed with a slight reduction in yield strength (928 MPa) and tensile strength (1003 MPa), but with a significant improvement in elongation at fracture (16.1%). Phase constituents of acicular α' phase in ASR and lamellar α + β phases in HIP samples were observed and quantified to corroborate the reduction in strength and increase in ductility. The anisotropic variation in elongation at fracture observed for the ASR samples, particularly built in the build (Z) direction, was related to the presence of “keyhole” porosity.

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Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 1897056

Report Number(s):: INL/JOU-22-68799-Rev000; TRN: US2310738

Journal Information:: Metals, Vol. 11, Issue 11; ISSN 2075-4701

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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