Synchronous improvement in strength and ductility of biomedical Co–Cr–Mo alloys by unique low-temperature heat treatment

Ueki, Kosuke; Abe, Mai; Ueda, Kyosuke; Nakai, Masaaki; Nakano, Takayoshi; Narushima, Takayuki

doi:https://doi.org/10.1016/j.msea.2018.10.016

Synchronous improvement in strength and ductility of biomedical Co–Cr–Mo alloys by unique low-temperature heat treatment

Ueki, Kosuke; Abe, Mai; Ueda, Kyosuke et al.

Materials Science and Engineering A, 2019, 739, 53-61

アクセス数:108件（2025-04-03 22:07 集計）

固定URL: https://hdl.handle.net/11094/89827

閲覧可能ファイル

ファイル	フォーマット	利用条件	サイズ	閲覧回数	利用開始日	説明	information
MaterSciEngA_739_53	pdf	なし	4.43 MB	68	2022.12.26

Creative Commons : 表示

論文情報

ファイル出力 EndNote Basic出力 Mendeley出力

タイトル	Synchronous improvement in strength and ductility of biomedical Co–Cr–Mo alloys by unique low-temperature heat treatment
著者	NRID 1000010845928 1000010845928 著者名 Ueki, Kosuke
	著者名 Abe, Mai
	NRID 1000040507901 1000040507901 著者名 Ueda, Kyosuke
	NRID 1000020431603 1000020431603 著者名 Nakai, Masaaki
	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
	NRID 1000020198394 1000020198394 著者名 Narushima, Takayuki
キーワード等	Heat treatment
	Mechanical properties
	Plastic deformation
	Stacking fault
	Strain-induced martensitic transformation
内容	Ueki K., Abe M., Ueda K., et al. Synchronous improvement in strength and ductility of biomedical Co–Cr–Mo alloys by unique low-temperature heat treatment. Materials Science and Engineering A, 739, 53. https://doi.org/10.1016/j.msea.2018.10.016.
抄録	The microstructure and tensile properties of Co–27Cr–6Mo (mass%) alloys heat-treated at 673–1373 K were studied. Lower elongation was observed after heat treatment at 1073 K due to formation of carbonitride precipitates. In contrast, when low-temperature heat treatment (LTHT) was applied at 673–873 K, both the ultimate tensile strength and elongation synchronously improved compared with the solution-treated alloy. Electron backscatter diffraction analysis for plastic-strained alloys and in situ X-ray diffraction analysis under stress-induced conditions revealed that the strain-induced martensitic transformation (SIMT) of the γ(fcc)-phase to ε(hcp)-phase during plastic deformation was suppressed by the LTHT. Stacking faults (thin ε-phase) were observed to collide in the LTHT alloys. The following mechanisms for the synchronous improvement in the tensile strength and elongation after LHTH are proposed. First, stacking faults with multiple variants were formed during LTHT. Then, the ε-phase of a single variant formed by SIMT during plastic deformation collides with preexisting multi-variant stacking faults formed during LTHT, increasing the tensile strength. In addition, the SIMT during plastic deformation is suppressed in the high-plastic-strain region by the collision. This decreases the total amount of ε-phase formed during plastic deformation, which improves the ductility. We demonstrated that LTHT of Co–Cr–Mo alloys effectively improves the performance and mechanical safety of spinal fixation implants, which often fracture because of fatigue cracking.
出版者	Elsevier
収録物名	Materials Science and Engineering A
巻(号)	739
ページ	53-61
刊行年月	2019-01-02
言語	英語
ハンドルURL	https://hdl.handle.net/11094/89827
PISSN	09215093
NCID	AA10720420
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1016/j.msea.2018.10.016
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	Materials Science and Engineering A. 2019, 739, p. 53-61
DC.title	Synchronous improvement in strength and ductility of biomedical Co–Cr–Mo alloys by unique low-temperature heat treatment
DC.creator	Ueki, Kosuke
	Abe, Mai
	Ueda, Kyosuke
	Nakai, Masaaki
	Nakano, Takayoshi
	Narushima, Takayuki
DC.publisher	Elsevier
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2019-01-02
DC.identifier	https://doi.org/10.1016/j.msea.2018.10.016
DC.subject	Heat treatment
	Mechanical properties
	Plastic deformation
	Stacking fault
	Strain-induced martensitic transformation
DC.description	Ueki K., Abe M., Ueda K., et al. Synchronous improvement in strength and ductility of biomedical Co–Cr–Mo alloys by unique low-temperature heat treatment. Materials Science and Engineering A, 739, 53. https://doi.org/10.1016/j.msea.2018.10.016.
DCTERMS.abstract	The microstructure and tensile properties of Co–27Cr–6Mo (mass%) alloys heat-treated at 673–1373 K were studied. Lower elongation was observed after heat treatment at 1073 K due to formation of carbonitride precipitates. In contrast, when low-temperature heat treatment (LTHT) was applied at 673–873 K, both the ultimate tensile strength and elongation synchronously improved compared with the solution-treated alloy. Electron backscatter diffraction analysis for plastic-strained alloys and in situ X-ray diffraction analysis under stress-induced conditions revealed that the strain-induced martensitic transformation (SIMT) of the γ(fcc)-phase to ε(hcp)-phase during plastic deformation was suppressed by the LTHT. Stacking faults (thin ε-phase) were observed to collide in the LTHT alloys. The following mechanisms for the synchronous improvement in the tensile strength and elongation after LHTH are proposed. First, stacking faults with multiple variants were formed during LTHT. Then, the ε-phase of a single variant formed by SIMT during plastic deformation collides with preexisting multi-variant stacking faults formed during LTHT, increasing the tensile strength. In addition, the SIMT during plastic deformation is suppressed in the high-plastic-strain region by the collision. This decreases the total amount of ε-phase formed during plastic deformation, which improves the ductility. We demonstrated that LTHT of Co–Cr–Mo alloys effectively improves the performance and mechanical safety of spinal fixation implants, which often fracture because of fatigue cracking.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	89827
citation_title	Synchronous improvement in strength and ductility of biomedical Co–Cr–Mo alloys by unique low-temperature heat treatment
citation_author	Ueki, Kosuke
	Abe, Mai
	Ueda, Kyosuke
	Nakai, Masaaki
	Nakano, Takayoshi
	Narushima, Takayuki
citation_publisher	Elsevier
citation_language	英語
citation_date	2019-01-02
citation_journal_title	Materials Science and Engineering A
citation_volume	739
citation_firstpage	53
citation_lastpage	61
citation_doi	https://doi.org/10.1016/j.msea.2018.10.016
citation_public_url	https://hdl.handle.net/11094/89827

Synchronous improvement in strength and ductility of biomedical Co–Cr–Mo alloys by unique low-temperature heat treatment

閲覧可能ファイル

論文情報

論文詳細を表示