Influence of Input Energy Density on Morphology of Unique Layered Microstructure of γ-TiAl Alloys Fabricated by Electron Beam Powder Bed Fusion

Cho, Ken; Morita, Naohide; Matsuoka, Hiromasa; Yasuda, Hiroyuki Y.; Todai, Mitsuharu; Ueda, Minoru; Takeyama, Masao; Nakano, Takayoshi

doi:https://doi.org/10.2320/matertrans.MT-MLA2022015

Influence of Input Energy Density on Morphology of Unique Layered Microstructure of γ-TiAl Alloys Fabricated by Electron Beam Powder Bed Fusion

Cho, Ken; Morita, Naohide; Matsuoka, Hiromasa et al.

Materials Transactions, 2023, 64(1), 44-49

Number of Access:975（2025-08-15 22:51 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/89909

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Title	Influence of Input Energy Density on Morphology of Unique Layered Microstructure of γ-TiAl Alloys Fabricated by Electron Beam Powder Bed Fusion
Creator	NRID 1000000633661 1000000633661 researchmap permalink choken choken Scopus Author ID 55535308400 55535308400 CreatorName Cho, Ken
	CreatorName Morita, Naohide
	CreatorName Matsuoka, Hiromasa
	NRID 1000060294021 1000060294021 ORCID 0000-0002-7077-0655 0000-0002-7077-0655 researchmap permalink read0051691 read0051691 Scopus Author ID 47861549600 47861549600 CreatorName Yasuda, Hiroyuki Y.
	NRID 1000010610800 1000010610800 CreatorName Todai, Mitsuharu
	CreatorName Ueda, Minoru
	NRID 1000030251622 1000030251622 CreatorName Takeyama, Masao
	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	additive manufacturing
	titanium aluminide
	energy density
	microstructure control
	tensile property
Description	Cho Ken, Morita Naohide, Matsuoka Hiromasa, et al. Influence of Input Energy Density on Morphology of Unique Layered Microstructure of γ-TiAl Alloys Fabricated by Electron Beam Powder Cho Ken, Morita Naohide, Matsuoka Hiromasa, et al. Influence of Input Energy Density on Morphology of Unique Layered Microstructure of γ-TiAl Alloys Fabricated by Electron Beam Powder Bed Fusion. MATERIALS TRANSACTIONS 64, 44 (2023); https://doi.org/10.2320/matertrans.MT-MLA2022015.
Abstract	Microstructure and tensile properties of Ti–48Al–2Cr–2Nb (at%) rods fabricated by electron beam powder bed fusion (EB-PBF) process were investigated by changing input energy density (ED) which is one of the important factors affecting formation of the melt pool. We found that unique layered microstructure consisting of an equiaxed γ grain layer (γ band) and a duplex region can be formed by EB-PBF with ED in the range of 13 to 31 J/mm3. It is interesting to note that the width of the γ band and the volume fraction of the γ phase in the duplex region decrease with increasing ED. On the other hand, the α2/γ lamellar grain in the duplex region increases with increasing ED. These morphological changes in the layered microstructure are attributed to variation of temperature distribution from melt pool caused by increasing ED. Moreover, we also found for the first time the strength of the alloys can be improved by decreasing width of the γ band and increasing of the α2/γ lamellar grain in the duplex region. Whereas, the width of the γ band and the fraction of the equiaxed γ grain in the duplex region should be increased to enhance ductility of the alloys.
Publisher	The Japan Institute of Metals and Materials
Source Title	Materials Transactions
Volume (Issue)	64(1)
Page	44-49
Date of Issued	2023-01-01
Language	English
Handle URL	https://hdl.handle.net/11094/89909
PISSN	13459678
eISSN	13475320
NCID	AA1217589X
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.2320/matertrans.MT-MLA2022015
Access Rights	open access
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	Materials Transactions. 2023, 64(1), p. 44-49
DC.title	Influence of Input Energy Density on Morphology of Unique Layered Microstructure of γ-TiAl Alloys Fabricated by Electron Beam Powder Bed Fusion
DC.creator	Cho, Ken
	Morita, Naohide
	Matsuoka, Hiromasa
	Yasuda, Hiroyuki Y.
	Todai, Mitsuharu
	Ueda, Minoru
	Takeyama, Masao
	Nakano, Takayoshi
DC.publisher	The Japan Institute of Metals and Materials
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2023-01-01
DC.identifier	https://doi.org/10.2320/matertrans.MT-MLA2022015
DC.subject	additive manufacturing
	titanium aluminide
	energy density
	microstructure control
	tensile property
DC.description	Cho Ken, Morita Naohide, Matsuoka Hiromasa, et al. Influence of Input Energy Density on Morphology of Unique Layered Microstructure of γ-TiAl Alloys Fabricated by Electron Beam Powder Cho Ken, Morita Naohide, Matsuoka Hiromasa, et al. Influence of Input Energy Density on Morphology of Unique Layered Microstructure of γ-TiAl Alloys Fabricated by Electron Beam Powder Bed Fusion. MATERIALS TRANSACTIONS 64, 44 (2023); https://doi.org/10.2320/matertrans.MT-MLA2022015.
DCTERMS.abstract	Microstructure and tensile properties of Ti–48Al–2Cr–2Nb (at%) rods fabricated by electron beam powder bed fusion (EB-PBF) process were investigated by changing input energy density (ED) which is one of the important factors affecting formation of the melt pool. We found that unique layered microstructure consisting of an equiaxed γ grain layer (γ band) and a duplex region can be formed by EB-PBF with ED in the range of 13 to 31 J/mm3. It is interesting to note that the width of the γ band and the volume fraction of the γ phase in the duplex region decrease with increasing ED. On the other hand, the α2/γ lamellar grain in the duplex region increases with increasing ED. These morphological changes in the layered microstructure are attributed to variation of temperature distribution from melt pool caused by increasing ED. Moreover, we also found for the first time the strength of the alloys can be improved by decreasing width of the γ band and increasing of the α2/γ lamellar grain in the duplex region. Whereas, the width of the γ band and the fraction of the equiaxed γ grain in the duplex region should be increased to enhance ductility of the alloys.
DC.format	89909
citation_title	Influence of Input Energy Density on Morphology of Unique Layered Microstructure of γ-TiAl Alloys Fabricated by Electron Beam Powder Bed Fusion
citation_author	Cho, Ken
	Morita, Naohide
	Matsuoka, Hiromasa
	Yasuda, Hiroyuki Y.
	Todai, Mitsuharu
	Ueda, Minoru
	Takeyama, Masao
	Nakano, Takayoshi
citation_publisher	The Japan Institute of Metals and Materials
citation_language	English
citation_date	2023-01-01
citation_journal_title	Materials Transactions
citation_volume	64
citation_issue	1
citation_firstpage	44
citation_lastpage	49
citation_doi	https://doi.org/10.2320/matertrans.MT-MLA2022015
citation_public_url	https://hdl.handle.net/11094/89909

Influence of Input Energy Density on Morphology of Unique Layered Microstructure of γ-TiAl Alloys Fabricated by Electron Beam Powder Bed Fusion

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