Improvement of mechanical properties by microstructural evolution of biomedical Co-Cr-W-Ni alloys with the addition of Mn and Si

Ueki, Kosuke; Yanagihara, Soh; Ueda, Kyosuke; Nakai, Masaaki; Nakano, Takayoshi; Narushima, Takayuki

doi:https://doi.org/10.2320/matertrans.MT-M2020300

Improvement of mechanical properties by microstructural evolution of biomedical Co-Cr-W-Ni alloys with the addition of Mn and Si

Ueki, Kosuke; Yanagihara, Soh; Ueda, Kyosuke et al.

Materials Transactions, 2021, 62(2), 229-238

Number of Access:554（2025-08-21 04:37 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/89889

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Title	Improvement of mechanical properties by microstructural evolution of biomedical Co-Cr-W-Ni alloys with the addition of Mn and Si
Creator	NRID 1000010845928 1000010845928 CreatorName Ueki, Kosuke
	CreatorName Yanagihara, Soh
	NRID 1000040507901 1000040507901 CreatorName Ueda, Kyosuke
	NRID 1000020431603 1000020431603 CreatorName Nakai, Masaaki
	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 1000020198394 1000020198394 CreatorName Narushima, Takayuki
Subject	Cobaltchromiumtungstennickel alloy
	Manganese addition
	Mechanical properties
	Plastic deformation behavior
	Precipitates
	Silicon addition
Description	Ueki K., Yanagihara S., Ueda K., et al. Improvement of mechanical properties by microstructural evolution of biomedical Co-Cr-W-Ni alloys with the addition of Mn and Si. Materials Transactions 62, 229 (2021); https://doi.org/10.2320/matertrans.MT-M2020300.
Abstract	We investigated changes in the microstructure and mechanical properties of biomedical Co-20Cr-15W-10Ni alloys (mass%) containing 8 mass% Mn and 0-3 mass% Si due to hot forging, solution treatment, cold swaging, and static recrystallization. The η-phase (M₆X-M₁₂X type cubic structure, M: metallic elements, X: C and/or N, space group: Fd-3m (227)) and CoWSi type Laves phase (C14 MgZn2 type hexagonal structure, space group: P63/mmc (194)) were confirmed as precipitates in the as-cast and as-forged alloys. To the best of our knowledge, this is the first report that reveals the formation of CoWSi type Laves phase precipitates in Co-Cr-W-Ni-based alloys. The addition of Si promoted the formation of precipitates of both η-phase and CoWSi type Laves phase. The solution-treated 8Mn+(0, 1)Si-added alloys exhibited TWIP-like plastic deformation behavior with an increasing work-hardening rate during the early to middle stages of plastic deformation. This plastic deformation behavior is effective in achieving both the low yield stress and high strength required to develop a high-performance balloon-expandable stent. The 8Mn+2Si-added alloy retained the CoWSi type Laves phase even after solution treatment, such that the ductility decreased but the strength improved. Additions of Mn and Si are effective in improving the ductility and strength of the Co-Cr-W-Ni alloy, respectively.
Publisher	The Japan Institute of Metals and Materials
Source Title	Materials Transactions
Volume (Issue)	62(2)
Page	229-238
Date of Issued	2021-02-01
Language	English
Handle URL	https://hdl.handle.net/11094/89889
PISSN	13459678
eISSN	13475320
NCID	AA1151294X
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.2320/matertrans.MT-M2020300
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. 2021, 62(2), p. 229-238
DC.title	Improvement of mechanical properties by microstructural evolution of biomedical Co-Cr-W-Ni alloys with the addition of Mn and Si
DC.creator	Ueki, Kosuke
	Yanagihara, Soh
	Ueda, Kyosuke
	Nakai, Masaaki
	Nakano, Takayoshi
	Narushima, Takayuki
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	2021-02-01
DC.identifier	https://doi.org/10.2320/matertrans.MT-M2020300
DC.subject	Cobaltchromiumtungstennickel alloy
	Manganese addition
	Mechanical properties
	Plastic deformation behavior
	Precipitates
	Silicon addition
DC.description	Ueki K., Yanagihara S., Ueda K., et al. Improvement of mechanical properties by microstructural evolution of biomedical Co-Cr-W-Ni alloys with the addition of Mn and Si. Materials Transactions 62, 229 (2021); https://doi.org/10.2320/matertrans.MT-M2020300.
DCTERMS.abstract	We investigated changes in the microstructure and mechanical properties of biomedical Co-20Cr-15W-10Ni alloys (mass%) containing 8 mass% Mn and 0-3 mass% Si due to hot forging, solution treatment, cold swaging, and static recrystallization. The η-phase (M₆X-M₁₂X type cubic structure, M: metallic elements, X: C and/or N, space group: Fd-3m (227)) and CoWSi type Laves phase (C14 MgZn2 type hexagonal structure, space group: P63/mmc (194)) were confirmed as precipitates in the as-cast and as-forged alloys. To the best of our knowledge, this is the first report that reveals the formation of CoWSi type Laves phase precipitates in Co-Cr-W-Ni-based alloys. The addition of Si promoted the formation of precipitates of both η-phase and CoWSi type Laves phase. The solution-treated 8Mn+(0, 1)Si-added alloys exhibited TWIP-like plastic deformation behavior with an increasing work-hardening rate during the early to middle stages of plastic deformation. This plastic deformation behavior is effective in achieving both the low yield stress and high strength required to develop a high-performance balloon-expandable stent. The 8Mn+2Si-added alloy retained the CoWSi type Laves phase even after solution treatment, such that the ductility decreased but the strength improved. Additions of Mn and Si are effective in improving the ductility and strength of the Co-Cr-W-Ni alloy, respectively.
DC.format	89889
citation_title	Improvement of mechanical properties by microstructural evolution of biomedical Co-Cr-W-Ni alloys with the addition of Mn and Si
citation_author	Ueki, Kosuke
	Yanagihara, Soh
	Ueda, Kyosuke
	Nakai, Masaaki
	Nakano, Takayoshi
	Narushima, Takayuki
citation_publisher	The Japan Institute of Metals and Materials
citation_language	English
citation_date	2021-02-01
citation_journal_title	Materials Transactions
citation_volume	62
citation_issue	2
citation_firstpage	229
citation_lastpage	238
citation_doi	https://doi.org/10.2320/matertrans.MT-M2020300
citation_public_url	https://hdl.handle.net/11094/89889

Improvement of mechanical properties by microstructural evolution of biomedical Co-Cr-W-Ni alloys with the addition of Mn and Si

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