MII-Tema_10.Fundiciones - TEMA 10 FUNDICIONES Cuestiones a...

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UC3M – Dpto. Materiales Materiales II - Fundiciones 10-1 TEMA 10 . - FUNDICIONES Cuestiones a tratar: .- Definición y clasificación de las fundiciones .- Fundiciones blancas .- Fundiciones grises .- Fundiciones maleables .- Fundiciones dúctiles
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UC3M – Dpto. Materiales Materiales II - Fundiciones 10-2 Aleaciones Fe-C-Si (Mn, P, S, etc.) Composición: 2-4 % C y 3 % Si Propiedades: Propiedades: checkbld Tf checkbld viscosidad (líquido) checkbld contracción checkbld resistencia al impacto checkbld tenacidad y ductilidad checkbld coste checkbld aplicaciones ingenieriles FUNDICIONES
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UC3M – Dpto. Materiales Materiales II - Fundiciones 10-3 CLASIFICACIÓN Clasificación de fundiciones (microestructura ): -fundición blanca -fundición gris -fundición maleable -fundición dúctil o esferoidal Microestructura Microestructura : Matriz de acero + carburo o grafito
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UC3M – Dpto. Materiales Materiales II - Fundiciones 10-4 Factores que influyen en el tipo de fundición: checkbld %C checkbld % Si checkbld Velocidad de enfriamiento Carbono equivalente: Carbono equivalente: %C eq = %C fundición +1/3 %Si
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UC3M – Dpto. Materiales Materiales II - Fundiciones 10-5 FUNDICIONES BLANCAS hipoeut hipoeut é ctica ctica (% C < 4.3) (% C < 4.3) eut é ctica (%C = 4.3) hipereut é ctica ctica (4.3 < %C < 6.67) Aleación Fe-C (1,7<%C<6,67) Fracturas blancas y brillantes T=25ºC : Fases: ferrita y cementita ESTABLE METAESTABLE
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UC3M – Dpto. Materiales Materiales II - Fundiciones 10-6 Microestructura de las fundiciones blancas hipoeut hipoeut é ctica: ctica: (Fe 3 C) s + Perlita (F+Fe 3 C)+ Ledeburita transformada (P+Fe 3 C)
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UC3M – Dpto. Materiales Materiales II - Fundiciones 10-7 Microestructura de las fundiciones blancas eut eut é ctica: ctica: (Fe 3 C) s + Ledeburita transformada (P+Fe 3 C) hipereut hipereut é ctica: ctica: (Fe 3 C) p + (Fe 3 C) s + Ledeburita transformada (P+Fe 3 C)
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UC3M – Dpto. Materiales Materiales II - Fundiciones 10-8 Propiedades Mec Propiedades Mec á nicas nicas checkbld Dureza elevada: hiper>hipo checkbld Resistencia a tracción baja: hipo>hiper checkbld R compresión
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