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- Title
Microstructural characterisation of stir zone containing residual ferrite in friction stir welded 304 austenitic stainless steel.
- Authors
Park, S. H. C.; Sato, Y. S.; Kokawa, H.; Okamoto, K.; Hirano, S.; Inagaki, M.
- Abstract
Friction stir welding was applied to a 2 mm thick 304 austenitic stainless steel plate. 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, which are typically observed in friction stir welds in aluminium alloys. The hardness of the SZ was higher than that of the base material and the maximum hardness was observed at the TMAZ. The higher hardness at the TMAZ was attributed to high densities of dislocations and subboundaries. Microstructural observations revealed that the ferrite was formed along grain boundaries of the austenite matrix in the advancing side of the SZ. It is suggested that the frictional heat due to stirring resulted in the phase transformation of austenite to ferrite and that upon rapid cooling the ferrite was retained in the SZ.
- Subjects
ELECTRIC welding; AUSTENITIC stainless steel; AUSTENITIC steel; FERRITES; ALLOYS; CORROSION resistant materials; WELDING
- Publication
Science & Technology of Welding & Joining, 2005, Vol 10, Issue 5, p550
- ISSN
1362-1718
- Publication type
Article
- DOI
10.1179/174329305X46691