Fatigue strength improvement of linear friction welded butt joints of low carbon steel by pressurizing after oscillation

Miao, Huilin; Tsutsumi, Seiichiro; Yamashita, Takayuki; Morisada, Yoshiaki; Fujii, Hidetoshi

doi:https://doi.org/10.1016/j.jmapro.2023.08.004

Fatigue strength improvement of linear friction welded butt joints of low carbon steel by pressurizing after oscillation

Miao, Huilin; Tsutsumi, Seiichiro; Yamashita, Takayuki et al.

Journal of Manufacturing Processes, 2023, 102, 795-805

Number of Access:566（2025-09-30 08:00 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/94532

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Title	Fatigue strength improvement of linear friction welded butt joints of low carbon steel by pressurizing after oscillation
Creator	CreatorName Miao, Huilin
	NRID 1000070344702 1000070344702 ORCID 0000-0002-9279-0657 0000-0002-9279-0657 researchmap permalink tsutsumi tsutsumi Scopus Author ID 7102881459 7102881459 CreatorName Tsutsumi, Seiichiro
	NRID 1000020829080 1000020829080 researchmap permalink mart111 mart111 Scopus Author ID 57195308182 57195308182 CreatorName Yamashita, Takayuki
	NRID 1000000416356 1000000416356 researchmap permalink morisada morisada CreatorName Morisada, Yoshiaki
	NRID 1000000247230 1000000247230 ORCID 0000-0002-5023-3844 0000-0002-5023-3844 researchmap permalink read0051741 read0051741 Scopus Author ID 7403071460 7403071460 CreatorName Fujii, Hidetoshi
Subject	Fatigue strength
	Linear friction welding
	Weld toe radius
Description	Miao H., Tsutsumi S., Yamashita T., et al. Fatigue strength improvement of linear friction welded butt joints of low carbon steel by pressurizing after oscillation. Journal of Manufacturing Processes 102, 795 (2023); https://doi.org/10.1016/j.jmapro.2023.08.004.
Abstract	Although linear friction welding (LFW) has received significant attention as an effective solid-state welding method, the fatigue properties of LFW joints have not been fully investigated. In this study, the fatigue strength of the steel joints fabricated using LFW was investigated and improved by increasing the pressure after oscillation. Low-carbon steel SM490A was successfully joined using LFW without unbonded areas or apparent softening in the heat-affected zone (HAZ). The microhardness, microstructure, weld toe shape, and fatigue life were assessed to investigate their relationships with the pressure conditions after oscillation. The results indicated that increasing the pressure after oscillation improved the area fraction of martensite (M) and the hardness of the weld interface center. The weld toe radius (ρ) and weld toe angle (α) also increased regardless of the upset control condition. The increasing of the pressure after oscillation from 50 MPa to 300 MPa increased ρ from 0.4 mm to 2.1 mm and the α increased from 92.7° to 103.4° at the weld center, accompanied by a reduced stress concentration factor (Kt) from 3.0 to 1.7. Under the fatigue test conditions of the stress range of 380 MPa, the fatigue life of the LFW as-welded joints was increased by approximately 31 % when the pressure after oscillation was 250 MPa compared to that of 50 MPa and by 87 % when it was 300 MPa compared to that of 250 MPa. Despite the possibility of fracture initiation at the weld toe at the edge of the LFW joints, the fatigue strength demonstrated a substantially longer fatigue life than the S-N design curve FAT90 recommended by the International Institute of Welding.
Publisher	Elsevier Ltd
Source Title	Journal of Manufacturing Processes
Volume (Issue)	102
Page	795-805
Date of Issued	2023-09-29
Language	English
Handle URL	https://hdl.handle.net/11094/94532
PISSN	15266125
Relation.isVersionOf	DOI (Publisher Version) https://doi.org/10.1016/j.jmapro.2023.08.004
Access Rights	embargoed access
CopyRight	© 2023. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
CopyRight	The full-text file will be made open to the public on 29 September 2025 in accordance with the publisher's policy.
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	Journal of Manufacturing Processes. 2023, 102, p. 795-805
DC.title	Fatigue strength improvement of linear friction welded butt joints of low carbon steel by pressurizing after oscillation
DC.creator	Miao, Huilin
	Tsutsumi, Seiichiro
	Yamashita, Takayuki
	Morisada, Yoshiaki
	Fujii, Hidetoshi
DC.publisher	Elsevier Ltd
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2023-09-29
DC.identifier	https://doi.org/10.1016/j.jmapro.2023.08.004
DC.subject	Fatigue strength
	Linear friction welding
	Weld toe radius
DC.description	Miao H., Tsutsumi S., Yamashita T., et al. Fatigue strength improvement of linear friction welded butt joints of low carbon steel by pressurizing after oscillation. Journal of Manufacturing Processes 102, 795 (2023); https://doi.org/10.1016/j.jmapro.2023.08.004.
DCTERMS.abstract	Although linear friction welding (LFW) has received significant attention as an effective solid-state welding method, the fatigue properties of LFW joints have not been fully investigated. In this study, the fatigue strength of the steel joints fabricated using LFW was investigated and improved by increasing the pressure after oscillation. Low-carbon steel SM490A was successfully joined using LFW without unbonded areas or apparent softening in the heat-affected zone (HAZ). The microhardness, microstructure, weld toe shape, and fatigue life were assessed to investigate their relationships with the pressure conditions after oscillation. The results indicated that increasing the pressure after oscillation improved the area fraction of martensite (M) and the hardness of the weld interface center. The weld toe radius (ρ) and weld toe angle (α) also increased regardless of the upset control condition. The increasing of the pressure after oscillation from 50 MPa to 300 MPa increased ρ from 0.4 mm to 2.1 mm and the α increased from 92.7° to 103.4° at the weld center, accompanied by a reduced stress concentration factor (Kt) from 3.0 to 1.7. Under the fatigue test conditions of the stress range of 380 MPa, the fatigue life of the LFW as-welded joints was increased by approximately 31 % when the pressure after oscillation was 250 MPa compared to that of 50 MPa and by 87 % when it was 300 MPa compared to that of 250 MPa. Despite the possibility of fracture initiation at the weld toe at the edge of the LFW joints, the fatigue strength demonstrated a substantially longer fatigue life than the S-N design curve FAT90 recommended by the International Institute of Welding.
DC.rights	© 2023. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
DC.rights	The full-text file will be made open to the public on 29 September 2025 in accordance with the publisher's policy.
DC.format	94532
citation_title	Fatigue strength improvement of linear friction welded butt joints of low carbon steel by pressurizing after oscillation
citation_author	Miao, Huilin
	Tsutsumi, Seiichiro
	Yamashita, Takayuki
	Morisada, Yoshiaki
	Fujii, Hidetoshi
citation_publisher	Elsevier Ltd
citation_language	English
citation_date	2023-09-29
citation_journal_title	Journal of Manufacturing Processes
citation_volume	102
citation_firstpage	795
citation_lastpage	805
citation_doi	https://doi.org/10.1016/j.jmapro.2023.08.004
citation_public_url	https://hdl.handle.net/11094/94532

Fatigue strength improvement of linear friction welded butt joints of low carbon steel by pressurizing after oscillation

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