Influence of unique layered microstructure on fatigue properties of Ti-48Al-2Cr-2Nb alloys fabricated by electron beam melting

Cho, Ken; Kobayashi, Ryota; Oh, Jong Yeong; Yasuda, Hiroyuki Y.; Todai, Mitsuharu; Nakano, Takayoshi; Ikeda, Ayako; Ueda, Minoru; Takeyama, Masao

doi:https://doi.org/10.1016/j.intermet.2018.01.009

Influence of unique layered microstructure on fatigue properties of Ti-48Al-2Cr-2Nb alloys fabricated by electron beam melting

Cho, Ken; Kobayashi, Ryota; Oh, Jong Yeong et al.

Intermetallics, 2018, 95, 1-10

Number of Access:1,317（2025-10-11 10:30 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/89903

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Title	Influence of unique layered microstructure on fatigue properties of Ti-48Al-2Cr-2Nb alloys fabricated by electron beam melting
Creator	NRID 1000000633661 1000000633661 researchmap permalink choken choken Scopus Author ID 55535308400 55535308400 ORCID 0009-0008-4612-6393 0009-0008-4612-6393 CreatorName Cho, Ken
	CreatorName Kobayashi, Ryota
	CreatorName Oh, Jong Yeong
	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
	NRID 1000030243182 1000030243182 ORCID 0000-0001-8052-1698 0000-0001-8052-1698 researchmap permalink read0013987 read0013987 Scopus Author ID 7403896013 7403896013 CreatorName Nakano, Takayoshi
	NRID 1000040746666 1000040746666 CreatorName Ikeda, Ayako
	CreatorName Ueda, Minoru
	NRID 1000030251622 1000030251622 CreatorName Takeyama, Masao
Subject	A. Intermetallics (aluminides)
	B. Fatigue resistance and crack growth
	D. Microstructure
	G. Aero–engine components
Description	Cho K., Kobayashi R., Oh J.Y., et al. Influence of unique layered microstructure on fatigue properties of Ti-48Al-2Cr-2Nb alloys fabricated by electron beam melting. Intermetallics 95, 1 (2018); https://doi.org/https://doi.org/10.1016/j.intermet.2018.01.009.
Abstract	The influence of a unique layered microstructure consisting of duplex-like region and equiaxed γ grain layers (γ bands) on the fatigue properties of Ti-48Al-2Cr-2Nb alloy bars fabricated by electron beam melting (EBM) was investigated at room temperature (RT) and 1023 K focusing on the angle (θ) between the building direction and cylinder (loading) axis. We found for the first time the fatigue strengths of the alloy bars with the layered microstructure depend strongly on the angle θ. Particularly, the fatigue strength of the alloy bars fabricated at θ = 45° is comparable to that of the hot isostatic pressing (HIP) treated cast alloys, even without HIP treatment. We also found the alloy bars fabricated at θ = 0° and 45° exhibit high fatigue strengths in the low-cycle fatigue life region at 1023 K similar to θ = 45° alloy bars at RT. These high fatigue strengths are caused by inhibition of the brittle main crack initiation by stress relaxation due to shear deformation at the γ bands and large plasticity of the alloys. These findings indicate that the alloys fabricated by EBM at θ = 45° with the unique layered microstructure have a great potential for aerospace and automobile applications.
Publisher	Elsevier
Source Title	Intermetallics
Volume (Issue)	95
Page	1-10
Date of Issued	2018-04-01
Language	English
Handle URL	https://hdl.handle.net/11094/89903
PISSN	09669795
NCID	AA10947696
Relation.isVersionOf	DOI (Publisher Version) https://doi.org/10.1016/j.intermet.2018.01.009
Access Rights	open access
CopyRight	©2018. This manuscript version is made available under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
oaire:version	Accepted Manuscript
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCMI Type	Text
DCTERMS.bibliographicCitation	Intermetallics. 2018, 95, p. 1-10
DC.title	Influence of unique layered microstructure on fatigue properties of Ti-48Al-2Cr-2Nb alloys fabricated by electron beam melting
DC.creator	Cho, Ken
	Kobayashi, Ryota
	Oh, Jong Yeong
	Yasuda, Hiroyuki Y.
	Todai, Mitsuharu
	Nakano, Takayoshi
	Ikeda, Ayako
	Ueda, Minoru
	Takeyama, Masao
DC.publisher	Elsevier
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2018-04-01
DC.identifier	https://doi.org/10.1016/j.intermet.2018.01.009
DC.subject	A. Intermetallics (aluminides)
	B. Fatigue resistance and crack growth
	D. Microstructure
	G. Aero–engine components
DC.description	Cho K., Kobayashi R., Oh J.Y., et al. Influence of unique layered microstructure on fatigue properties of Ti-48Al-2Cr-2Nb alloys fabricated by electron beam melting. Intermetallics 95, 1 (2018); https://doi.org/https://doi.org/10.1016/j.intermet.2018.01.009.
DCTERMS.abstract	The influence of a unique layered microstructure consisting of duplex-like region and equiaxed γ grain layers (γ bands) on the fatigue properties of Ti-48Al-2Cr-2Nb alloy bars fabricated by electron beam melting (EBM) was investigated at room temperature (RT) and 1023 K focusing on the angle (θ) between the building direction and cylinder (loading) axis. We found for the first time the fatigue strengths of the alloy bars with the layered microstructure depend strongly on the angle θ. Particularly, the fatigue strength of the alloy bars fabricated at θ = 45° is comparable to that of the hot isostatic pressing (HIP) treated cast alloys, even without HIP treatment. We also found the alloy bars fabricated at θ = 0° and 45° exhibit high fatigue strengths in the low-cycle fatigue life region at 1023 K similar to θ = 45° alloy bars at RT. These high fatigue strengths are caused by inhibition of the brittle main crack initiation by stress relaxation due to shear deformation at the γ bands and large plasticity of the alloys. These findings indicate that the alloys fabricated by EBM at θ = 45° with the unique layered microstructure have a great potential for aerospace and automobile applications.
DC.rights	©2018. This manuscript version is made available under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
DC.format	89903
citation_title	Influence of unique layered microstructure on fatigue properties of Ti-48Al-2Cr-2Nb alloys fabricated by electron beam melting
citation_author	Cho, Ken
	Kobayashi, Ryota
	Oh, Jong Yeong
	Yasuda, Hiroyuki Y.
	Todai, Mitsuharu
	Nakano, Takayoshi
	Ikeda, Ayako
	Ueda, Minoru
	Takeyama, Masao
citation_publisher	Elsevier
citation_language	English
citation_date	2018-04-01
citation_journal_title	Intermetallics
citation_volume	95
citation_firstpage	1
citation_lastpage	10
citation_doi	https://doi.org/10.1016/j.intermet.2018.01.009
citation_public_url	https://hdl.handle.net/11094/89903

Influence of unique layered microstructure on fatigue properties of Ti-48Al-2Cr-2Nb alloys fabricated by electron beam melting

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