Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/40595
Title: Avaliação da susceptibilidade de precipitação da fase sigma na soldagem do aço inoxidável duplex SAF2205
Other Titles: Evaluation of the sigma phase precipitation susceptibility in duplex stainless steel SAF2205 welding
Keywords: Aço inoxidável duplex
GMAW
Aporte térmico
Fase sigma
Duplex stainless steel
Heat input
Phase sigma
Issue Date: 2019
Publisher: Rede Latino-Americana de Materiais
Citation: FONSECA, C. S. et al. Avaliação da susceptibilidade de precipitação da fase sigma na soldagem do aço inoxidável duplex SAF2205. Revista Matéria, Rio de Janeiro, v. 24, n. 3, 2019. Não paginado.
Abstract: Welding of duplex stainless steels is a critical operation, due to the thermal cycling to which the material is subjected, which can favor the precipitation of deleterious phases. The purpose of this research is to analyze the influence of welding energy on susceptibility to sigma phase formation in SAF2205 duplex steel. The SAF2205 sheets were welded by the GMAW welding process, varying the welding energy by 0.5 kJ/mm, 1.0 kJ/mm, 1.5 kJ/mm. The material was analyzed by optical microscopy, XRD and Vickers microhardness. The analysis of the microstructure of the plates showed that the higher the thermal input used in the welding, the greater the amount of austenite and the larger the size of the austenitic and ferritic grains. By means of the microhardness profile it was verified that the reduction of the hardness in the ZTA occurs. Through the XRD, the presence of sigma phase was determined in the weld regions for samples welded with welding energy of 1.0 kJ/mm and 1.5 kJ/mm. It was concluded that in the GMAW welding processes of SAF2205 duplex stainless steels with a 4 mm thick thermal input close to 0.5 kJ/mm when the objective is to avoid the formation of sigma phase and approximately equal to 1.5 kJ/mm when the objective is to maintain percentage of the phases in the ZTA and ZF next to the metal.
URI: http://repositorio.ufla.br/jspui/handle/1/40595
Appears in Collections:DEG - Artigos publicados em periódicos



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