RESUMOA área da metalografia quantitativa aplicada às ciências dos materiais utiliza o processamento digital de imagens para caracterização de parâmetros que influenciam nas propriedades dos materiais. Neste trabalho foram quantificados o percentual das fases ferrita e austenita em chapas do aço inoxidável duplex UNS S32304 soldado por processamento TIG autógeno com subsequente tratamento térmico a 600, 650, 700 e 750 °C por 8h e resfriado ao ar. As análises foram feitas utilizando os programas de processamento de imagens FIJI -ImageJ e SVRNA, com imagens obtidas por microscopia óptica. Os resultados encontrados foram próximos, entretanto o FIJI se mostrou mais preciso na análise de partículas menores sem muito contraste, quando comparado ao SVRNA. O processo de soldagem promoveu o desbalanceamento de fases e o aumento da temperatura de tratamento térmico promoveu o aumento do teor da fase austenítica.Palavras chaves: Aço inoxidável duplex; ImageJ; SVRNA; Quantificação de fases.
ABSTRACTThe quantitative metallographic area applied to materials sciences uses digital image processing to characterize parameters that influence the materials properties. In this work was quantified the percentage of the ferrite and austenite phases in UNS S32304 duplex stainless steel welded plates by the autogenous TIG processing with subsequent heat treatment at 600, 650, 700 and 750 °C for 8 hours and cooled to air. The analyzes were performed using the image processing programs FIJI -ImageJ and SVRNA, with images obtained by light microscopy. The results were close, however the FIJI showed to be more accurate in the analysis of smaller particles with less contrast when compared to the SVRNA. The welding process promoted the unbalance of phases and the increase of the temperature of heat treatment promoted the increase of the content of the austenitic phase.
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