Effect of a helium gas atmosphere on the mechanical properties of Ti-6Al-4V alloy built with laser powder bed fusion: A comparative study with argon gas

Amano, Hiroki; Ishimoto, Takuya; Suganuma, Ryoya; Aiba, Keisuke; Sun, Shi Hai; Ozasa, Ryosuke; Nakano, Takayoshi

doi:https://doi.org/10.1016/j.addma.2021.102444

Effect of a helium gas atmosphere on the mechanical properties of Ti-6Al-4V alloy built with laser powder bed fusion: A comparative study with argon gas

Amano, Hiroki; Ishimoto, Takuya; Suganuma, Ryoya et al.

Additive Manufacturing, 2021, 48(B), 102444

Number of Access:540（2025-07-18 10:02 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/89763

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Title	Effect of a helium gas atmosphere on the mechanical properties of Ti-6Al-4V alloy built with laser powder bed fusion: A comparative study with argon gas
Creator	CreatorName Amano, Hiroki
	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 Suganuma, Ryoya
	CreatorName Aiba, Keisuke
	CreatorName Sun, Shi Hai
	NRID 1000080845347 1000080845347 ORCID 0000-0002-2773-072X 0000-0002-2773-072X researchmap permalink ozasa_r ozasa_r Scopus Author ID 56202812400 56202812400 CreatorName Ozasa, Ryosuke
	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	Atmosphere
	Cooling rate
	Helium
	Laser powder bed fusion
	Thermal conductivity
Description	Amano H., Ishimoto T., Suganuma R., et al. Effect of a helium gas atmosphere on the mechanical properties of Ti-6Al-4V alloy built with laser powder bed fusion: A comparative study with argon gas. Additive Manufacturing, 48, 102444. https://doi.org/10.1016/j.addma.2021.102444.
Abstract	In metal additive manufacturing, the microstructures and associated mechanical properties of metal specimens can be controlled over a wide range. Although process parameters are considered important in the fabrication of functional parts, the effect of atmospheric gas has not been comprehensively documented. In laser powder bed fusion (LPBF), gas flow is used to eliminate fumes generated by laser irradiation. Simultaneously, the gas removes heat from the laser-irradiated part, which is exposed to high temperature. In this study, we investigated the capacity of helium as an alternative to argon, which is conventionally used as the LPBF atmosphere gas. He has a higher thermal conductivity and lower gas density than Ar, which may result in enhanced heat removal from the Ti-6Al-4V alloy during fabrication. Numerical simulations suggest a greater cooling rate under He flow. Further, the material built under He flow contained finer α' martensite grains and showed improved mechanical properties compared to those fabricated under Ar flow, despite the identical laser irradiation conditions. Thus, He gas is advantageous in LPBF for fabricating products with superior mechanical performance through microstructural refinement, and this is a result of its capacity for cooling and fume generation inhibition. Therefore, this study reveals the importance of the choice of atmospheric gas because of its effects on the characteristics of metallic specimens fabricated using LPBF.
Publisher	Elsevier
Source Title	Additive Manufacturing
Volume (Issue)	48(B)
Page	102444
Date of Issued	2021-12-01
Language	English
Handle URL	https://hdl.handle.net/11094/89763
eISSN	22148604
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.1016/j.addma.2021.102444
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	Additive Manufacturing. 2021, 48(B), p. 102444
DC.title	Effect of a helium gas atmosphere on the mechanical properties of Ti-6Al-4V alloy built with laser powder bed fusion: A comparative study with argon gas
DC.creator	Amano, Hiroki
	Ishimoto, Takuya
	Suganuma, Ryoya
	Aiba, Keisuke
	Sun, Shi Hai
	Ozasa, Ryosuke
	Nakano, Takayoshi
DC.publisher	Elsevier
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2021-12-01
DC.identifier	https://doi.org/10.1016/j.addma.2021.102444
DC.subject	Atmosphere
	Cooling rate
	Helium
	Laser powder bed fusion
	Thermal conductivity
DC.description	Amano H., Ishimoto T., Suganuma R., et al. Effect of a helium gas atmosphere on the mechanical properties of Ti-6Al-4V alloy built with laser powder bed fusion: A comparative study with argon gas. Additive Manufacturing, 48, 102444. https://doi.org/10.1016/j.addma.2021.102444.
DCTERMS.abstract	In metal additive manufacturing, the microstructures and associated mechanical properties of metal specimens can be controlled over a wide range. Although process parameters are considered important in the fabrication of functional parts, the effect of atmospheric gas has not been comprehensively documented. In laser powder bed fusion (LPBF), gas flow is used to eliminate fumes generated by laser irradiation. Simultaneously, the gas removes heat from the laser-irradiated part, which is exposed to high temperature. In this study, we investigated the capacity of helium as an alternative to argon, which is conventionally used as the LPBF atmosphere gas. He has a higher thermal conductivity and lower gas density than Ar, which may result in enhanced heat removal from the Ti-6Al-4V alloy during fabrication. Numerical simulations suggest a greater cooling rate under He flow. Further, the material built under He flow contained finer α' martensite grains and showed improved mechanical properties compared to those fabricated under Ar flow, despite the identical laser irradiation conditions. Thus, He gas is advantageous in LPBF for fabricating products with superior mechanical performance through microstructural refinement, and this is a result of its capacity for cooling and fume generation inhibition. Therefore, this study reveals the importance of the choice of atmospheric gas because of its effects on the characteristics of metallic specimens fabricated using LPBF.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	89763
citation_title	Effect of a helium gas atmosphere on the mechanical properties of Ti-6Al-4V alloy built with laser powder bed fusion: A comparative study with argon gas
citation_author	Amano, Hiroki
	Ishimoto, Takuya
	Suganuma, Ryoya
	Aiba, Keisuke
	Sun, Shi Hai
	Ozasa, Ryosuke
	Nakano, Takayoshi
citation_publisher	Elsevier
citation_language	English
citation_date	2021-12-01
citation_journal_title	Additive Manufacturing
citation_volume	48
citation_issue	B
citation_firstpage	102444
citation_doi	https://doi.org/10.1016/j.addma.2021.102444
citation_public_url	https://hdl.handle.net/11094/89763

Effect of a helium gas atmosphere on the mechanical properties of Ti-6Al-4V alloy built with laser powder bed fusion: A comparative study with argon gas

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