Transformaciones de fase en las uniones soldadas simuladas de los aceros inoxidables dúplex
Archivos
Fecha
2018-06-20
Autores
Betancourt Portal, Gustavo
Título de la revista
ISSN de la revista
Título del volumen
Editor
Universidad Central “Marta Abreu” de Las Villas
Resumen
Se simulan zonas de influencia térmica (HAZ) en un acero inoxidable dúplex SAF 2205 con diferentes velocidades de enfriamiento. La microestructura y las propiedades de estas regiones se estudian con microscopía óptica (MO) y electrónica (MET). Las fases presentes (austenita γ y ferrita ẟ) en cada HAZ se cuantifican tomando en consideración las diferentes formas morfológicas de γ. Además, se calculan los principales parámetros de cada forma morfológica para las diferentes velocidades de enfriamiento. Esto permite establecer una ley de mezclas donde la tensión de fluencia obtenida para los respectivos valores de dureza está en correspondencia con la tensión de fluencia experimental. Además, la fracción de nitruros de cromo registrados con el MET permite justificar los perfiles de microdureza de la ferrítica y su influencia en la resistencia a la corrosión en la HAZ para diferentes tiempos de enfriamiento
The heated effected zones (HAZs) in a duplex stainless steel SAF 2205 were simulated for different cooling times. The microstructure and properties of these regions were studied with optical and electronic microscopy. The phases (austenite γ and ferrite ẟ) in each HAZs microstructure were quantified taking into account the different austenite morphological forms. Also, the major microstructural parameters of each morphological form were calculated at the different cooling rates. This allows to establish a mixture law where the yield strength obtained from the hardness values is corresponded with the experimental yield strength. Furthermore, the chromium nitride fractions recorded in TEM allowed justifying the microhardness profiles in the ferrite matrix influencing in the pitting corrosion resistance in these HAZs at the different cooling times
The heated effected zones (HAZs) in a duplex stainless steel SAF 2205 were simulated for different cooling times. The microstructure and properties of these regions were studied with optical and electronic microscopy. The phases (austenite γ and ferrite ẟ) in each HAZs microstructure were quantified taking into account the different austenite morphological forms. Also, the major microstructural parameters of each morphological form were calculated at the different cooling rates. This allows to establish a mixture law where the yield strength obtained from the hardness values is corresponded with the experimental yield strength. Furthermore, the chromium nitride fractions recorded in TEM allowed justifying the microhardness profiles in the ferrite matrix influencing in the pitting corrosion resistance in these HAZs at the different cooling times
Descripción
Palabras clave
Aceros Inoxidables Dúplex, Zona de Influencia Térmica, Ciclos Térmicos, Soldadura Simulada, Duplex Stainless Steel, Heated Affected Zone, Thermal Cycle, Simulated Weld