Juan David Granados - Academia.edu (original) (raw)
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Max Planck Institute for Iron Research
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Papers by Juan David Granados
journal of Engineering Science and Technology Review, 2018
The influence of Martensite Volume Fraction (MVF) on fracture mechanisms in a Dual Phase steel wi... more The influence of Martensite Volume Fraction (MVF) on fracture mechanisms in a Dual Phase steel with two different grain sizes was studied in this work. Ferrite-Martensite microstructure was obtained by an intercritical heat treatment for both groups of grain sizes. The results show a direct relationship between a higher temperature during the intercritical heat treatment and the increase of the MVF. The fine microstructure with higher MVF presents a high tensile strength and a good ductility. Furthermore, in relation to the material behavior under impact conditions, grain refinement and higher values of MVF promote ductile fracture by typical microvoid coalescence. High values of impact energy refer to the presence of low-carbon martensite formed at higher temperatures, which is more ductile than high carbon martensite formed at lower temperatures. Additionally, fine-grained materials have a better ability to dissipate impact energy. It was shown that an increase of 10.0% in MVF allows fine grain microstructures to improve their capacity to dissipate impact energy by 11.4%. This behavior may be explained because of the low carbon content of the as-received material, and the mechanical properties of the martensite obtained by the intercritical heat treatment.
Resumen: En el presente estudio se evaluo el efecto de someter un acero AISI – SAE 5160H a temper... more Resumen: En el presente estudio se evaluo el efecto de someter un acero AISI – SAE 5160H a temperaturas bajo cero dentro de las etapas de tratamiento termico convencional, caracterizando la tenacidad de fractura mediante probetas de flexion en tres puntos y la velocidad de crecimiento de grietas por fatiga mediante probetas de tension de tipo compacto para determinar las constantes segun el modelo de Paris. Se encontro que someter el acero a un revenido inicial, de manera previa al tratamiento bajo cero, inhibe el efecto que pueda tener un tratamiento bajo-cero posterior debido a la estabilizacion de la microestructura. El tratamiento en el que el acero se sometio a tratamiento criogenico seguido por un revenido a alta temperatura puede llegar a superar en el comportamiento mecanico de un acero sometido a un tratamiento convencional.
journal of Engineering Science and Technology Review, 2018
The influence of Martensite Volume Fraction (MVF) on fracture mechanisms in a Dual Phase steel wi... more The influence of Martensite Volume Fraction (MVF) on fracture mechanisms in a Dual Phase steel with two different grain sizes was studied in this work. Ferrite-Martensite microstructure was obtained by an intercritical heat treatment for both groups of grain sizes. The results show a direct relationship between a higher temperature during the intercritical heat treatment and the increase of the MVF. The fine microstructure with higher MVF presents a high tensile strength and a good ductility. Furthermore, in relation to the material behavior under impact conditions, grain refinement and higher values of MVF promote ductile fracture by typical microvoid coalescence. High values of impact energy refer to the presence of low-carbon martensite formed at higher temperatures, which is more ductile than high carbon martensite formed at lower temperatures. Additionally, fine-grained materials have a better ability to dissipate impact energy. It was shown that an increase of 10.0% in MVF allows fine grain microstructures to improve their capacity to dissipate impact energy by 11.4%. This behavior may be explained because of the low carbon content of the as-received material, and the mechanical properties of the martensite obtained by the intercritical heat treatment.
Resumen: En el presente estudio se evaluo el efecto de someter un acero AISI – SAE 5160H a temper... more Resumen: En el presente estudio se evaluo el efecto de someter un acero AISI – SAE 5160H a temperaturas bajo cero dentro de las etapas de tratamiento termico convencional, caracterizando la tenacidad de fractura mediante probetas de flexion en tres puntos y la velocidad de crecimiento de grietas por fatiga mediante probetas de tension de tipo compacto para determinar las constantes segun el modelo de Paris. Se encontro que someter el acero a un revenido inicial, de manera previa al tratamiento bajo cero, inhibe el efecto que pueda tener un tratamiento bajo-cero posterior debido a la estabilizacion de la microestructura. El tratamiento en el que el acero se sometio a tratamiento criogenico seguido por un revenido a alta temperatura puede llegar a superar en el comportamiento mecanico de un acero sometido a un tratamiento convencional.