Publication: Caracterización microestructural, micromecánica y tribológica de aceros dual phase de alta resistencia sometidos a procesos de perfilado en frío (Microstructural, micromechanical and trobological characterización of high strength dual phase steels subjected to cold roll forming processes)
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2012
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Abstract
El sector de la automoción ha impulsado numerosos desarrollos en el campo de los materiales, específicamente aceros, para disminuir el peso en sus estructuras y, por tanto, el consumo de combustible y las emisiones de CO2 a la atmósfera. Uno de estos nuevos aceros que ha despertado mayor interés es el acero dual-phase, perteneciente a la familia de aceros avanzados de alta resistencia (AHSS, Advanced High Strength Steels), debido a su composición de ferrita y martensita la cual otorga a este acero una elevada resistencia con una excelente ductilidad. Sin embargo, los aceros dual-phase presentan cierta dificultad a la hora de someterse a un proceso de conformado en frío como es el perfilado de geometría variable, proceso usual para la fabricación de piezas estructurales de los automóviles. En el presente trabajo se ha llevado a cabo una extensa caracterización microestructural (mediante
microscopía óptica, microscopía electrónica de barrido y utilizando la técnica de electrones retrodispersados (EBSD)), mecánica (mediante ensayos de ultramicrodureza) y tribológica (mediante ensayos de ball-on-disc) con la finalidad de optimizar los procesos de conformado en frio de aceros dual-phase. [ABSTRACT] The automotive industry has prompted many developments in the field of materials,
particularly steels, to reduce the weight in their structures and, therefore, to reduce fuel consumption and CO2 emissions during the manufacturing of car bodies. One of these new advanced high strength steels (AHSS) is the dual-phase steel, that due to its composition of ferrite and martensite phases provide a high strength with excellent ductility. However, dualphase steels present some difficulty when they are subjected to a cold forming process such as variable geometry roll-forming, that is a usual process for the manufacture of structural parts of automobiles. The present work shows the extensive microstructural characterization (by optical microscopy, scanning electron microscopy and using backscattered electron technique (EBSD)), mechanical (by ultramicrohardness tests) and tribological (by ball-on-disc test) carried out in order to optimize the cold forming processes of dual-phase steels.
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Máster Universitario en Física Aplicada. Facultad de Ciencias Físicas. Curso 2011-2012.
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