Compressive residual stress applied to a low-carbon steel surface alloyed with WC tool constituent elements according to friction stir processing

Yamamoto, Hajime; Yamamoto, Yuji; Ito, Kazuhiro; Mikami, Yoshiki

doi:https://doi.org/10.1016/j.matdes.2024.113225

Compressive residual stress applied to a low-carbon steel surface alloyed with WC tool constituent elements according to friction stir processing

Yamamoto, Hajime; Yamamoto, Yuji; Ito, Kazuhiro et al.

Materials and Design, 2024, 244, 113225

アクセス数:56件（2025-05-16 17:04 集計）

固定URL: https://hdl.handle.net/11094/98247

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タイトル	Compressive residual stress applied to a low-carbon steel surface alloyed with WC tool constituent elements according to friction stir processing
著者	NRID 1000000842577 1000000842577 ORCID 0000-0001-6562-5624 0000-0001-6562-5624 researchmap permalink h.yamamoto h.yamamoto Scopus Author ID 57193028962 57193028962 著者名 Yamamoto, Hajime
	著者名 Yamamoto, Yuji
	NRID 1000060303856 1000060303856 researchmap permalink kazuhiro_ito5 kazuhiro_ito5 Scopus Author ID 7410406840 7410406840 著者名 Ito, Kazuhiro
	NRID 1000040397758 1000040397758 ORCID 0000-0002-7685-3152 0000-0002-7685-3152 researchmap permalink read0134237 read0134237 Scopus Author ID 35318208400 35318208400 著者名 Mikami, Yoshiki
キーワード等	Friction stir processing
	Residual stress
	Surface alloying
	Retained austenite
	Deformation-induced martensitic transformation
	Tungsten carbide
内容	Yamamoto H., Yamamoto Y., Ito K., et al. Compressive residual stress applied to a low-carbon steel surface alloyed with WC tool constituent elements according to friction stir processing. Materials and Design 244, 113225 (2024); https://doi.org/10.1016/j.matdes.2024.113225.
抄録	Friction stir processing (FSP) effectively improves the fatigue strength of arc-welded joints; however, wear of tools is inevitable in case of high-strength materials. Notably, a new benefit has been discovered: compressive residual stress is applied on the FSPed steel surface, alloyed with the WC tool constituent elements, contrasting with the tensile residual stress typically applied via conventional FSP. To elucidate the mechanism of compressive residual stress application, FSP was performed on a low-carbon steel plate at various rotational speeds. The alloyed topmost layers in the stir zone comprised martensite structures with a small amount of retained austenite grains, resulting in a hardness increase owing to the tool constituent elements. The residual stresses on the stir zone surface were influenced by the alloying contents and the corresponding martensite start temperature (Ms). Compressive residual stresses were maximized at an Ms of approximately 150 °C owing to martensitic transformation expansion near room temperature. Lowering the Ms below approximately 150 °C led to tensile residual stresses and an increased volume fraction of the retained austenite, suggesting that martensitic transformation expansion is insufficient to apply compressive residual stress. Conversely, the retained austenite can resist plastic deformation and crack propagation through deformation-induced martensitic transformation, thereby enhancing fatigue properties.
出版者	Elsevier Ltd
収録物名	Materials and Design
巻(号)	244
ページ	113225
刊行年月	2024-08-01
言語	英語
ハンドルURL	https://hdl.handle.net/11094/98247
PISSN	02641275
eISSN	18734197
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1016/j.matdes.2024.113225
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
DCTERMS.bibliographicCitation	Materials and Design. 2024, 244, p. 113225
DC.title	Compressive residual stress applied to a low-carbon steel surface alloyed with WC tool constituent elements according to friction stir processing
DC.creator	Yamamoto, Hajime
	Yamamoto, Yuji
	Ito, Kazuhiro
	Mikami, Yoshiki
DC.publisher	Elsevier Ltd
DC.language' scheme='DCTERMS.RFC1766	英語
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2024-08-01
DC.identifier	https://doi.org/10.1016/j.matdes.2024.113225
DC.subject	Friction stir processing
	Residual stress
	Surface alloying
	Retained austenite
	Deformation-induced martensitic transformation
	Tungsten carbide
DC.description	Yamamoto H., Yamamoto Y., Ito K., et al. Compressive residual stress applied to a low-carbon steel surface alloyed with WC tool constituent elements according to friction stir processing. Materials and Design 244, 113225 (2024); https://doi.org/10.1016/j.matdes.2024.113225.
DCTERMS.abstract	Friction stir processing (FSP) effectively improves the fatigue strength of arc-welded joints; however, wear of tools is inevitable in case of high-strength materials. Notably, a new benefit has been discovered: compressive residual stress is applied on the FSPed steel surface, alloyed with the WC tool constituent elements, contrasting with the tensile residual stress typically applied via conventional FSP. To elucidate the mechanism of compressive residual stress application, FSP was performed on a low-carbon steel plate at various rotational speeds. The alloyed topmost layers in the stir zone comprised martensite structures with a small amount of retained austenite grains, resulting in a hardness increase owing to the tool constituent elements. The residual stresses on the stir zone surface were influenced by the alloying contents and the corresponding martensite start temperature (Ms). Compressive residual stresses were maximized at an Ms of approximately 150 °C owing to martensitic transformation expansion near room temperature. Lowering the Ms below approximately 150 °C led to tensile residual stresses and an increased volume fraction of the retained austenite, suggesting that martensitic transformation expansion is insufficient to apply compressive residual stress. Conversely, the retained austenite can resist plastic deformation and crack propagation through deformation-induced martensitic transformation, thereby enhancing fatigue properties.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	98247
citation_title	Compressive residual stress applied to a low-carbon steel surface alloyed with WC tool constituent elements according to friction stir processing
citation_author	Yamamoto, Hajime
	Yamamoto, Yuji
	Ito, Kazuhiro
	Mikami, Yoshiki
citation_publisher	Elsevier Ltd
citation_language	英語
citation_date	2024-08-01
citation_journal_title	Materials and Design
citation_volume	244
citation_firstpage	113225
citation_doi	https://doi.org/10.1016/j.matdes.2024.113225
citation_public_url	https://hdl.handle.net/11094/98247

Compressive residual stress applied to a low-carbon steel surface alloyed with WC tool constituent elements according to friction stir processing

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