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Impact Toughness of High-Strength Low-Alloy Steels Joined by Friction STIR Welding.

Authors :
Dolzhenko, A. S.
Lugovskaya, A. S.
Malopheyev, S. S.
Belyakov, A. N.
Source :
Russian Physics Journal. Sep2024, Vol. 67 Issue 9, p1356-1363. 8p.
Publication Year :
2024

Abstract

The microstructure and impact toughness of high-strength low-alloy steels joined by friction stir welding are studied. The hardened steel samples are tempered at a temperature of 600–650°C for 1 hour, followed by warm rolling to a total strain of 1.5 at the same temperature. The resulting steels are characterized by an ultrafine-grained lamella-type microstructure. The as-processed steel plates are joined by friction stir welding. A martensitic microstructure is formed in the stir zone. The steel samples with a carbon content of 0.15% show high impact toughness of 68 J/cm2 at room temperature with a gradual decrease to 16 J/cm2 at a temperature of –196°C, while the steel samples with a carbon content of 0.36% exhibit an impact toughness of 10 J/cm2 at room temperature. The 0.36% carbon steel joints are tempered at a temperature of 650°C for 1 hour, which increases their room-temperature impact toughness to 67 J/cm2. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
10648887
Volume :
67
Issue :
9
Database :
Academic Search Index
Journal :
Russian Physics Journal
Publication Type :
Academic Journal
Accession number :
180004107
Full Text :
https://doi.org/10.1007/s11182-024-03254-6