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

Number of Access:651（2025-08-13 23:03 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/98247

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Title
Compressive residual stress applied to a low-carbon steel surface alloyed with WC tool constituent elements according to friction stir processing
Creator
NRID
1000000842577 1000000842577
ORCID
0000-0001-6562-5624 0000-0001-6562-5624
researchmap permalink
h.yamamoto h.yamamoto
Scopus Author ID
57193028962 57193028962
CreatorName
Yamamoto, Hajime
CreatorName
Yamamoto, Yuji
NRID
1000060303856 1000060303856
researchmap permalink
kazuhiro_ito5 kazuhiro_ito5
Scopus Author ID
7410406840 7410406840
CreatorName
Ito, Kazuhiro
NRID
1000040397758 1000040397758
ORCID
0000-0002-7685-3152 0000-0002-7685-3152
researchmap permalink
read0134237 read0134237
Scopus Author ID
35318208400 35318208400
CreatorName
Mikami, Yoshiki
Subject
Friction stir processing
Residual stress
Surface alloying
Retained austenite
Deformation-induced martensitic transformation
Tungsten carbide
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.
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.
Publisher
Elsevier Ltd
Source Title
Materials and Design
Volume (Issue)
244
Page
113225
Date of Issued
2024-08-01
Language
English
Handle URL
https://hdl.handle.net/11094/98247
PISSN
02641275
eISSN
18734197
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1016/j.matdes.2024.113225
Access Rights
open access
CopyRight
This article is licensed under a Creative Commons Attribution 4.0 International License.
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Version of Record
Category
学術雑誌論文 Journal Article