Microstructures in friction stir welded 304 austenitic stainless steel

H. Kokawa; S. H.C. Park; Y. S. Sato; K. Okamoto; S. Hirano; M. Inagaki

doi:10.1007/BF03266473

Microstructures in friction stir welded 304 austenitic stainless steel

H. Kokawa, S. H.C. Park, Y. S. Sato, K. Okamoto, S. Hirano, M. Inagaki

ENG - Materials Processing

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

Friction stir welding was applied to 304 austenitic stainless steel. The microstructural evolution and hardness distribution in the weld were investigated. The stir zone (SZ) and thermomechanically affected zone (TMAZ) showed dynamically recrystallised and recovered microstructures, respectively. The hardness of the SZ was higher than that of the base material and the maximum hardness was located in the TMAZ. The higher hardness in TMAZ was attributed to high density of dislocations and sub-grains. Electron microscopic observations revealed that ferrite and sigma phase were formed in austenite matrix in the SZ depending on the cooling rate during FSW.

Original language	English
Pages (from-to)	34-40
Number of pages	7
Journal	Welding in the World
Volume	49
Issue number	3-4
DOIs	https://doi.org/10.1007/BF03266473
Publication status	Published - 2005 Jan 1

Keywords

Austenite
Ferrite
Friction stir welding
Friction welding
Grain size
Hardness
Mechanical properties
Recrystallisation
Reference lists
Stainless steels
Steels; microstructure

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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abstract = "Friction stir welding was applied to 304 austenitic stainless steel. The microstructural evolution and hardness distribution in the weld were investigated. The stir zone (SZ) and thermomechanically affected zone (TMAZ) showed dynamically recrystallised and recovered microstructures, respectively. The hardness of the SZ was higher than that of the base material and the maximum hardness was located in the TMAZ. The higher hardness in TMAZ was attributed to high density of dislocations and sub-grains. Electron microscopic observations revealed that ferrite and sigma phase were formed in austenite matrix in the SZ depending on the cooling rate during FSW.",

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AU - Kokawa, H.

AU - Park, S. H.C.

AU - Sato, Y. S.

AU - Okamoto, K.

AU - Hirano, S.

AU - Inagaki, M.

PY - 2005/1/1

Y1 - 2005/1/1

N2 - Friction stir welding was applied to 304 austenitic stainless steel. The microstructural evolution and hardness distribution in the weld were investigated. The stir zone (SZ) and thermomechanically affected zone (TMAZ) showed dynamically recrystallised and recovered microstructures, respectively. The hardness of the SZ was higher than that of the base material and the maximum hardness was located in the TMAZ. The higher hardness in TMAZ was attributed to high density of dislocations and sub-grains. Electron microscopic observations revealed that ferrite and sigma phase were formed in austenite matrix in the SZ depending on the cooling rate during FSW.

AB - Friction stir welding was applied to 304 austenitic stainless steel. The microstructural evolution and hardness distribution in the weld were investigated. The stir zone (SZ) and thermomechanically affected zone (TMAZ) showed dynamically recrystallised and recovered microstructures, respectively. The hardness of the SZ was higher than that of the base material and the maximum hardness was located in the TMAZ. The higher hardness in TMAZ was attributed to high density of dislocations and sub-grains. Electron microscopic observations revealed that ferrite and sigma phase were formed in austenite matrix in the SZ depending on the cooling rate during FSW.

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KW - Ferrite

KW - Friction stir welding

KW - Friction welding

KW - Grain size

KW - Hardness

KW - Mechanical properties

KW - Recrystallisation

KW - Reference lists

KW - Stainless steels

KW - Steels; microstructure

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