
handle: 10495/5793
RESUMEN: En este trabajo se estudian los fenómenos metalúrgicos que ocurren en la soldadura SMAW de un acero inoxidable ferrítico AISI 430 con un acero inoxidable austenítico AISI 316L. Para el estudio se utilizaron dos tipos de electrodos: austenítico AWS E309L y dúplex AWS E2209-16, ambos con un diámetro de 3.2 mm. La unión se realizó con un solo pase y manteniendo alta la entrada de calor. Se evaluó la influencia del tipo de electrodo en la evolución microestructural de la zona afectada por el calor y de la zona de fusión, encontrando diferencias en la morfología de la ferrita δ para ambos depósitos, evidenciando crecimiento y refinación de grano ferrítico y formación de martensita en la zona afectada por el calor del metal base ferrítico. Se evaluó también la resistencia a la tensión hallando similitudes en los dos depósitos. La dureza y el porcentaje de ferrita δ fueron medidos.
ABSTRACT: The metallurgical transformations of SMAW welding of AISI 316L austenitic stainless steel with AISI 430 ferritic stainless steel were studied. Two different electrodes, AWS E309L austenitic and AWS E2209-16 duplex stainless steels 3.2 mm diameter were used to perform the study. The joining was made with a single pass welding and keeping a high heat input. The influence that the electrodes have on the microstructural evolution in the heat affected zone and fusion zone was evaluated. Differences between δ ferrite morphology were found for both weld metals. The heat affected zone of the ferritic side showed grain coarsening and grain refinement with martensite at the grain boundaries. Tensile strength was similar for both welding conditions. Microhardness and δ ferrite percentage were measured as well.
Uniones soldadas, SMAW, Acero inoxidable austenítico, Soldadura de aceros inoxidables, Acero inoxidable ferrítico, 620, Metalurgia de la soldadura
Uniones soldadas, SMAW, Acero inoxidable austenítico, Soldadura de aceros inoxidables, Acero inoxidable ferrítico, 620, Metalurgia de la soldadura
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