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

アクセス数:129件（2025-04-03 22:07 集計）

固定URL: https://hdl.handle.net/11094/89779

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タイトル	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
著者	著者名 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 著者名 Ishimoto, Takuya
	著者名 Morita, Naotaka
	著者名 Ikeo, Naoko
	NRID 1000030243182 1000030243182 ORCID 0000-0001-8052-1698 0000-0001-8052-1698 researchmap permalink read0013987 read0013987 Scopus Author ID 7403896013 7403896013 著者名 Nakano, Takayoshi
キーワード等	Electron beam powder bed fusion
	Laser powder bed fusion
	Phase composition
	Thermal history
	Ti alloys
内容	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.
抄録	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.
出版者	MDPI
収録物名	Crystals
巻(号)	11(7)
ページ	796
刊行年月	2021-07-08
言語	英語
ハンドルURL	https://hdl.handle.net/11094/89779
eISSN	20734352
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.3390/cryst11070796
アクセス権	open access
権利情報	This article is licensed under a Creative Commons Attribution 4.0 International License.
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCMI資源タイプ	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	英語
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	英語
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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