Microstructural characterization and corrosion behavior of a commercial friction stir welded AA2024-T3
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2018
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BRAZILIAN MRS MEETING, 17th
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Resumo
Friction Stir Welding (FSW) arises as a great development by removing rivets,
fasteners and lap joints areas, consequently, decreasing the aircraft weight.
However, during the welding process, the plastic deformation and heat
generation at the joint and surrounding areas lead to three distinct
microstructural zones, namely, nugget or stir zone (SZ), thermo-mechanically
affected zone (TMAZ), heat affected zone (HAZ), besides the base metal (BM). In
these zones the microstructure of the material can be profoundly modified and
localized corrosion phenomena can be more easily developed, which can be
enhanced by local galvanic coupling due to changes in the microstructure as
grain refinement and recrystallization, changes in the grain boundaries,
dissolution and precipitation of hardening precipitates and dispersóides. In the
present work, a commercial friction stir welded AA2024-T3 had its microstructure
characterized by Electron Backscatter Diffraction (EBSD) technique and optical
microscopy (OM). The corrosion behavior was investigated by exfoliation
corrosion (EXCO) test and the intergranular corrosion susceptibility according to
ASTM G110-97. After all tests, the samples were observed by scanning electron
microscopy (SEM). EBSD results revealed the evolution of microstructure as a
result of FSW. The base metal showed elongated grains along the rolling direction
with a pancake-like non-recrystallized structure. The SZ undergone dynamic
recrystallization showing finer equiaxed grains as a result of a significant plastic
deformation and heating during the welding process. The TMAZ of the advancing
side showed recrystallized finer grains, while the TMAZ of the retreating side
showed coarse grains. Finally, the HAZ of both advancing and retreating sides
showed grains typically elongated caused by the thermal input. The EXCO and
intergranular tests showed a more intense attack in the TMAZ of the retreating
side in agreement with the corrosion morphology observed by SEM.
Como referenciar
QUEIROZ, FERNANDA M.; ARAUJO, JOAO V.S.; TERADA, MAYSA; LAMAKA, SVIATLANA; COSTA, ISOLDA; MELO, HERCILIO G. de. Microstructural characterization and corrosion behavior of a commercial friction stir welded AA2024-T3. In: BRAZILIAN MRS MEETING, 17th, September 16-20, 2018, Natal, RN. Abstract... São Carlos: Aptor Software, 2018. p. 1199-1199. Disponível em: http://repositorio.ipen.br/handle/123456789/30341. Acesso em: 07 Jun 2024.
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