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Type: Artigo de evento
Title: Superplastic Deformation Of A Duplex Stainless Steel
Author: Pulino-Sagradi D.
Medrano R.E.
Nazar A.M.M.
Abstract: Superplastic behavior of a duplex stainless steel has been studied at 1223 K (950°C) and 1253 K (980°C) for initial strain-rates ranging from 2×10-4 s-1 to 8×10-3 s-1. In the given range of temperature, it was observed that the elongation increased as the strain rate decreased. The best superplastic conditions were obtained at 1253 K where the samples presented homogeneous deformation along the gage length. Under this temperature the maximum elongation (900%) was obtained for an initial strain-rate of 4×10-4 s-1. Those results were also confirmed by determination of the strain-rate sensitivity coefficient, m, which presented the highest value at 1253 K and clearly increased with decreasing strain-rate. Microstructure studies and previous information about the amount of cavities suggest that the deformation process occurs by a superplastic grain boundary sliding mechanism.
Rights: fechado
Identifier DOI: 
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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