Comparison of phase characteristics and residual stresses in ti-6al-4v alloy manufactured by laser powder bed fusion (L-pbf) and electron beam powder bed fusion (eb-pbf) techniques

Takase, Aya; Ishimoto, Takuya; Morita, Naotaka; Ikeo, Naoko; Nakano, Takayoshi

doi:https://doi.org/10.3390/cryst11070796

Comparison of phase characteristics and residual stresses in ti-6al-4v alloy manufactured by laser powder bed fusion (L-pbf) and electron beam powder bed fusion (eb-pbf) techniques

Takase, Aya; Ishimoto, Takuya; Morita, Naotaka et al.

Crystals, 2021, 11(7), 796

Number of Access:434（2025-07-18 10:02 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/89779

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Title	Comparison of phase characteristics and residual stresses in ti-6al-4v alloy manufactured by laser powder bed fusion (L-pbf) and electron beam powder bed fusion (eb-pbf) techniques
Creator	CreatorName Takase, Aya
	NRID 1000050508835 1000050508835 ORCID 0000-0003-0081-0591 0000-0003-0081-0591 researchmap permalink i_taku i_taku Scopus Author ID 35310484700 35310484700 CreatorName Ishimoto, Takuya
	CreatorName Morita, Naotaka
	CreatorName Ikeo, Naoko
	NRID 1000030243182 1000030243182 ORCID 0000-0001-8052-1698 0000-0001-8052-1698 researchmap permalink read0013987 read0013987 Scopus Author ID 7403896013 7403896013 CreatorName Nakano, Takayoshi
Subject	Electron beam powder bed fusion
	Laser powder bed fusion
	Phase composition
	Thermal history
	Ti alloys
Description	Takase A., Ishimoto T., Morita N., et al. Comparison of phase characteristics and residual stresses in ti-6al-4v alloy manufactured by laser powder bed fusion (L-pbf) and electron beam powder bed fusion (eb-pbf) techniques. Crystals, 11, 7, 796. https://doi.org/10.3390/cryst11070796.
Abstract	Ti-6Al-4V alloy fabricated by laser powder bed fusion (L-PBF) and electron beam powder bed fusion (EB-PBF) techniques have been studied for applications ranging from medicine to aviation. The fabrication technique is often selected based on the part size and fabrication speed, while less attention is paid to the differences in the physicochemical properties. Especially, the relationship between the evolution of α, α’, and β phases in as-grown parts and the fabrication techniques is unclear. This work systematically and quantitatively investigates how L-PBF and EB-PBF and their process parameters affect the phase evolution of Ti-6Al-4V and residual stresses in the final parts. This is the first report demonstrating the correlations among measured parameters, indicating the lattice strain reduces, and c/a increases, shifting from an α’ to α+β or α structure as the crystallite size of the α or α’ phase increases. The experimental results combined with heat-transfer simulation indicate the cooling rate near the β transus temperature dictates the resulting phase characteristics, whereas the residual stress depends on the cooling rate immediately below the solidification temperature. This study provides new insights into the previously unknown differences in the α, α’, and β phase evolution between L-PBF and EB-PBF and their process parameters.
Publisher	MDPI
Source Title	Crystals
Volume (Issue)	11(7)
Page	796
Date of Issued	2021-07-08
Language	English
Handle URL	https://hdl.handle.net/11094/89779
eISSN	20734352
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.3390/cryst11070796
Access Rights	open access
CopyRight	This article is licensed under a Creative Commons Attribution 4.0 International License.
oaire:version	Version of Record
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCMI Type	Text
DCTERMS.bibliographicCitation	Crystals. 2021, 11(7), p. 796
DC.title	Comparison of phase characteristics and residual stresses in ti-6al-4v alloy manufactured by laser powder bed fusion (L-pbf) and electron beam powder bed fusion (eb-pbf) techniques
DC.creator	Takase, Aya
	Ishimoto, Takuya
	Morita, Naotaka
	Ikeo, Naoko
	Nakano, Takayoshi
DC.publisher	MDPI
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2021-07-08
DC.identifier	https://doi.org/10.3390/cryst11070796
DC.subject	Electron beam powder bed fusion
	Laser powder bed fusion
	Phase composition
	Thermal history
	Ti alloys
DC.description	Takase A., Ishimoto T., Morita N., et al. Comparison of phase characteristics and residual stresses in ti-6al-4v alloy manufactured by laser powder bed fusion (L-pbf) and electron beam powder bed fusion (eb-pbf) techniques. Crystals, 11, 7, 796. https://doi.org/10.3390/cryst11070796.
DCTERMS.abstract	Ti-6Al-4V alloy fabricated by laser powder bed fusion (L-PBF) and electron beam powder bed fusion (EB-PBF) techniques have been studied for applications ranging from medicine to aviation. The fabrication technique is often selected based on the part size and fabrication speed, while less attention is paid to the differences in the physicochemical properties. Especially, the relationship between the evolution of α, α’, and β phases in as-grown parts and the fabrication techniques is unclear. This work systematically and quantitatively investigates how L-PBF and EB-PBF and their process parameters affect the phase evolution of Ti-6Al-4V and residual stresses in the final parts. This is the first report demonstrating the correlations among measured parameters, indicating the lattice strain reduces, and c/a increases, shifting from an α’ to α+β or α structure as the crystallite size of the α or α’ phase increases. The experimental results combined with heat-transfer simulation indicate the cooling rate near the β transus temperature dictates the resulting phase characteristics, whereas the residual stress depends on the cooling rate immediately below the solidification temperature. This study provides new insights into the previously unknown differences in the α, α’, and β phase evolution between L-PBF and EB-PBF and their process parameters.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	89779
citation_title	Comparison of phase characteristics and residual stresses in ti-6al-4v alloy manufactured by laser powder bed fusion (L-pbf) and electron beam powder bed fusion (eb-pbf) techniques
citation_author	Takase, Aya
	Ishimoto, Takuya
	Morita, Naotaka
	Ikeo, Naoko
	Nakano, Takayoshi
citation_publisher	MDPI
citation_language	English
citation_date	2021-07-08
citation_journal_title	Crystals
citation_volume	11
citation_issue	7
citation_firstpage	796
citation_doi	https://doi.org/10.3390/cryst11070796
citation_public_url	https://hdl.handle.net/11094/89779

Comparison of phase characteristics and residual stresses in ti-6al-4v alloy manufactured by laser powder bed fusion (L-pbf) and electron beam powder bed fusion (eb-pbf) techniques

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