Effects of microstructure and phosphorus segregation on tensile properties of friction stir welded high phosphorus weathering steel

Chen, Junqi; Miura, Takuya; Ushioda, Kohsaku et al.

Materials Science and Engineering: A, 2024, 916, 147315

Number of Access:341（2025-08-14 15:06 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/98455

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Title
Effects of microstructure and phosphorus segregation on tensile properties of friction stir welded high phosphorus weathering steel
Creator
CreatorName
Chen, Junqi
NRID
1000060781466 1000060781466
ORCID
0000-0002-8991-5412 0000-0002-8991-5412
researchmap permalink
miuratky miuratky
Scopus Author ID
55162450300 55162450300
CreatorName
Miura, Takuya
CreatorName
Ushioda, Kohsaku
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
Friction stir welding
Microstructure
Phosphorus segregation
Tensile property
Weathering steel
Description
Chen J., Miura T., Ushioda K., et al. Effects of microstructure and phosphorus segregation on tensile properties of friction stir welded high phosphorus weathering steel. Materials Science and Engineering: A 916, 147315 (2024); https://doi.org/10.1016/j.msea.2024.147315.
Abstract
Defect-free sound joints of high-phosphorus (0.094 wt%) weathering steel (SPA-H) were successfully fabricated using friction stir welding (FSW). This study examines the microstructural evolution and mechanical properties of joints produced at different FSW parameters. Tensile tests of the joints revealed that fractures occurred in the base metal (BM) region, indicating almost 100 % welding efficiency. Furthermore, the stir zones (SZ) demonstrated a marked improvement in tensile properties. Particularly, at the rotation rate of 80 rpm and axial load of 45 kN condition (below A1), the microstructure featured ultra-fine ferrite and cementite, resulting in high hardness (270 HV) and tensile strength (704 MPa) in steel with just 0.08 wt% C, while maintaining nearly 80 % of the total elongation of BM. However, the SZ at 80 rpm exhibited an unusual decrease in local elongation despite the fine ferrite grain size and cementite presence. Electron probe microanalysis (EPMA) and nano-hardness revealed pronounced phosphorus segregation in the ferrite region and significant localized hardness disparities induced by the segregation behavior. The strain concentration at the interfaces between these regions during the tensile process leads to crack initiation and rapid propagation. The negative factor caused by the phosphorus segregation accelerates the failure of the specimen during the necking stage and ultimately shows decreased local elongation.
Publisher
Elsevier Ltd
Source Title
Materials Science and Engineering: A
Volume (Issue)
916
Page
147315
Date of Issued
2024-11-01
Language
English
Handle URL
https://hdl.handle.net/11094/98455
PISSN
09215093
Relation.isVersionOf
DOI (Publisher Version)
https://doi.org/10.1016/j.msea.2024.147315
Access Rights
embargoed access
CopyRight
© 2024. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
The full-text file will be made open to the public on 1 November 2026 in accordance with the publisher's policy.
oaire:version
Accepted Manuscript
Category
学術雑誌論文 Journal Article