Corrosion behavior of a 2304 lean duplex stainless steel cold-rolled and short-term annealed at different temperatures.
Data
2023
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Resumo
This study examined the effects of cold working and subsequent annealing treatment for a short time on the
corrosion behavior of a lean duplex stainless steel (LDSS). The as-received sample was solution treated at 1100 °C
for 1800 s and cold rolled. The cold deformation (75%) was followed by isochronic annealing at 900, 950, 1000,
1050 and 1100 °C for 180 s. The microstructural changes were evaluated by scanning electron microscopy
(SEM) and Vickers hardness, while corrosion behavior was investigated by cyclic potentiodynamic polarization
technique and electrochemical impedance spectroscopy (EIS) in 3.5% NaCl solution at 22 ± 2 °C. After cyclic
polarization, pits morphology was characterized by SEM. Cold rolling lowered lamellar spacing between the
phases and increased hardness. Hardness at temperatures higher than 950 °C was equal to the 2304 LDSS
solution treated. Although grain refinement is observed due to recrystallization, the corrosion resistance was not
significantly improved. The highest pitting potential and charge transfer resistance were obtained after annealing
at 1000 °C for 180 s. The pit distribution indicates that the corrosion behavior of the phases changed during the
cold rolling and annealing treatment, and pitting was initiated preferentially in the α/γ boundaries and inside the
α domains.
Descrição
Palavras-chave
Lean duplex stainless steel, Pitting corrosion, Short-term annealing
Citação
ASSUMPÇÃO, R. F.; SICUPIRA, D. C.; SANTOS, D. B. Corrosion behavior of a 2304 lean duplex stainless steel cold-rolled and short-term annealed at different temperatures. Materia-Rio de Janeiro, v. 28, n. 2, 2023. Disponível em: <https://www.scielo.br/j/rmat/a/mN3xBBXhmd8ZsrbPZBXPWvF/>. Acesso em: 01 ago. 2023.