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

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...

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Autores principales:	Asif Mahmud, Thinh Huynh, Le Zhou, Holden Hyer, Abhishek Mehta, Daniel D. Imholte, Nicolas E. Woolstenhulme, Daniel M. Wachs, Yongho Sohn
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	laser powder bed fusion titanium alloy hot isostatic pressing phase transformations Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/5222840734d4431ca771927938b0691b
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spelling	oai:doaj.org-article:5222840734d4431ca771927938b0691b2021-11-25T18:21:06ZMechanical Behavior Assessment of Ti-6Al-4V ELI Alloy Produced by Laser Powder Bed Fusion10.3390/met111116712075-4701https://doaj.org/article/5222840734d4431ca771927938b0691b2021-10-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1671https://doaj.org/toc/2075-4701The 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.Asif MahmudThinh HuynhLe ZhouHolden HyerAbhishek MehtaDaniel D. ImholteNicolas E. WoolstenhulmeDaniel M. WachsYongho SohnMDPI AGarticlelaser powder bed fusiontitanium alloyhot isostatic pressingphase transformationsMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1671, p 1671 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	laser powder bed fusion titanium alloy hot isostatic pressing phase transformations Mining engineering. Metallurgy TN1-997
spellingShingle	laser powder bed fusion titanium alloy hot isostatic pressing phase transformations Mining engineering. Metallurgy TN1-997 Asif Mahmud Thinh Huynh Le Zhou Holden Hyer Abhishek Mehta Daniel D. Imholte Nicolas E. Woolstenhulme Daniel M. Wachs Yongho Sohn Mechanical Behavior Assessment of Ti-6Al-4V ELI Alloy Produced by Laser Powder Bed Fusion
description	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.
format	article
author	Asif Mahmud Thinh Huynh Le Zhou Holden Hyer Abhishek Mehta Daniel D. Imholte Nicolas E. Woolstenhulme Daniel M. Wachs Yongho Sohn
author_facet	Asif Mahmud Thinh Huynh Le Zhou Holden Hyer Abhishek Mehta Daniel D. Imholte Nicolas E. Woolstenhulme Daniel M. Wachs Yongho Sohn
author_sort	Asif Mahmud
title	Mechanical Behavior Assessment of Ti-6Al-4V ELI Alloy Produced by Laser Powder Bed Fusion
title_short	Mechanical Behavior Assessment of Ti-6Al-4V ELI Alloy Produced by Laser Powder Bed Fusion
title_full	Mechanical Behavior Assessment of Ti-6Al-4V ELI Alloy Produced by Laser Powder Bed Fusion
title_fullStr	Mechanical Behavior Assessment of Ti-6Al-4V ELI Alloy Produced by Laser Powder Bed Fusion
title_full_unstemmed	Mechanical Behavior Assessment of Ti-6Al-4V ELI Alloy Produced by Laser Powder Bed Fusion
title_sort	mechanical behavior assessment of ti-6al-4v eli alloy produced by laser powder bed fusion
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/5222840734d4431ca771927938b0691b
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_version_	1718411256290869248

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

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