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Title: Effect of thermal aging on the microstructure and mechanical properties of stainless steel UNS S31803.
Authors: Costa, Junia Maria Gândara
Lacerda, José Carlos de
Godefroid, Leonardo Barbosa
Cândido, Luiz Cláudio
Keywords: Duplex stainless steel
Sigma phase
Mechanical properties
Issue Date: 2020
Citation: COSTA, J. M. G. et al. Effect of thermal aging on the microstructure and mechanical properties of stainless steel UNS S31803. Matéria, v. 27, n. 1, artigo e13128, 2022. Disponível em: <>. Acesso em: 15 mar. 2023.
Abstract: Duplex stainless steel UNS S31803 exhibits high mechanical strength with high corrosion properties, due to its microstructure composed of ferrite and austenite phases, in equal proportion. When the UNS S31803 steel is submitted to high temperatures, some precipitations can occur, such as nitrites, carbides, and third phases (e.g. sigma phase -σ, and alpha prime - α'). These phases are deleterious in relation to the mechanical properties and corrosion resistance, and their effects are analyzed regarding the properties of the steel. In order to evaluate the precipitation of this deleterious phase, isothermal treatment was done at 500°C for 144 hours (α' phase) and at 850ºC for 80 minutes (σ phase). The results were obtained through the microstructural analysis and tensile tests. The presence of sigma phase was verified in the grain boundary, an increase in the mechanical resistance with a loss of toughness. There was as well as an increase in mechanical resistance with the precipitation of α', with less loss of ductility than that observed in the experiments involving the presence of sigma phase.
ISSN: 1517-7076
metadata.dc.rights.license: This is an open access article under the CC BY-NC-ND license ( Fonte: PDF do artigo.
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