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- Title
Effects of solution heat treatment on grain growth and degree of sensitization of AISI 321 austenitic stainless steel.
- Authors
de Sousa, Regina Célia; Filho, José Carlos Cardoso; Tanaka, Auro Atsushi; Oliveira, Ayana Cristina S.; Ferreira, Wilman Eduardo Italiano
- Abstract
This work investigates the influence of solution temperature on grain growth and degree of sensitization of AISI 321 steel. Samples were solution treated at temperatures between 800 and 1,200°C for 80 min and sensitized at 600°C for 105 h. Optical microscopy and double loop electrochemical potentiodynamic reactivation (DLEPR) techniques were used to characterize and evaluate the degree of sensitization. The grain coarsening temperature ( T gc) found was 1,080°C, with occurrence of abnormal or discontinuous grain growth. Samples submitted to solution heat treatment below 1,080°C presented average grain diameter approximately equal to those presented by non-heat treated samples. The sensitization process at 600°C for 105 h became null when the samples were previously solution treated at 800 or 900°C, for 80 min. Sensitized and previously solution treated samples for temperatures greater than 1,075°C presented a decrease in sensitization intensity and an increase in transgranular precipitation.
- Subjects
AUSTENITIC stainless steel; MICROSCOPY; ELECTROCHEMICAL analysis; OSTWALD ripening; CRYSTAL growth; MATERIALS science
- Publication
Journal of Materials Science, 2006, Vol 41, Issue 8, p2381
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-006-2468-3