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Desarrollo de aleaciones TWIP por molienda mecánica

Authors: Pérez Pablo, Sergio;

Desarrollo de aleaciones TWIP por molienda mecánica

Abstract

En este trabajo fin de grado se han intentado conseguir piezas de acero de composición TWIP (TWinning induced plasticity) a partir de polvo de acero de esta misma composición. El objetivo principal es conseguir un acero de una gran resistencia, caracterizada por un alto límite elástico. El método escogido para hacerlo ha sido la molienda mecánica, que permite un gran endurecimiento al deformar severamente el material. Se ha partido de un polvo de composición Fe-22Mn-1,5Si-1,5Al-0,4C y se han realizado moliendas variando el contenido de cera (para evitar que el polvo se adhiera a las paredes) entre 0,6 y 1 por ciento y aumentando el tiempo de molienda (10, 15, 20 y 25 horas, según los casos). Se ha seguido el proceso de endurecimiento del polvo y el cambio de su morfología. Con los contenidos de cera mayores se ha visto que el proceso se vuelve más lento y con los menores se ha observado que, aunque la molienda es más rápida, corre el riesgo de producir soldadura en frio. A partir de las curvas de endurecimiento se han elegido una serie de muestras de polvo y realizado un proceso de compactación en frío y sinterización a 1100º C durante una hora. En las probetas sinterizadas se ha determinado la dureza final y se ha realizado una caracterización microestructural mediante microscopía óptica, utilizando un ataque electrolítico. En las muestras sinterizadas tapadas se observa que el ataque es más severo que en las que no lo estaban, y el tamaño de grano es claramente inferior en las muestras con más horas de molienda.

Country
Spain
Keywords

Steel, High strength, :Enginyeria mecànica [Àrees temàtiques de la UPC], Steel, High strength, Acer d'alta resistència, Àrees temàtiques de la UPC::Enginyeria mecànica, Steel--Heat treatment, Acer austenític

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visibility
selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
views
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