Fe-C MArtin
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IAGRAMA
IERRO - CARBONO
Presentado por:Martin Alonso Nieto Diaz
Codigo: 2011-103024E-mail:alonsin27@gmail!om
Cel: ""#"0040"
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IERRO CARBONO
INTRODUCCION
El Acero es básicamente una aleación o combinación de hierro ycarbono (alrededor de 0,08% hasta menos de un 2%). Algunasveces otros elementos de aleación esec!"icos tales como el #r o$i se agregan con roósitos determinados.
i la aleación osee una concentración de carbono mayor al 2,0%se roducen "undiciones &ue, en oosición al acero, son&uebradi'as y no es osible "orarlas sino &ue deben sermoldeadas.
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En el diagrama de "ase del e se observa las "ormas alotróicasdel hierro sólido, *## y ##, a distintas temeraturas+
$ierro al%a &'(: #ristali'a a -8 #. u estructura cristalina es*## con una distancia interatómica de 2.8- /. rácticamenteno disuelve en carbono.
$ierro gamma &)(: e resenta de 10# a 300#.
#ristali'a en la estructura cristalina ## con mayor volumen&ue la estructura cristalina de hierro al"a. 4isuelve "ácilmenteen carbono y es una variedad de e amagn5tico.
$ierro delta &*(: e inicia a los 300# y resenta unareducción en la distancia interatómica &ue la hace retornar auna estructura cristalina *##. u má6ima solubilidad decarbono es 0.00% a 38#. $o osee una imortanciaindustrial relevante. A artir de 7# se inicia la "usión dele uro.
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9as aleaciones hierro:carbono ertenecen al tio dealeaciones &ue "orman una comosición &u!mica. El carbonose uede encontrar en las aleaciones hierro:carbono, tanto en
estado ligado (e#), como en estado libre (#, es decir,gra"ito), or eso, el diagrama comrende dos sistemas+
Fe−Fe3C (metaestable); este sistema está
representado en el diagrama con líneas llenas
gruesas y comprende aceros y fundiciones blancas,o sea, las aleaciones con el carbono ligado, sin
carbono libre (grafito).
Fe−C (estable); en el diagrama se representa conlíneas punteadas; este sistema expone el esquema
de formación de las estructuras en las fundiciones
grises y atruchadas donde el carbono se encuentra
total o parcialmente en estado libre (grafito).
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FASES DEL DIAGRAMAHIERRO CARBONO
+A,E A,.EN/.CA &0 asta 21 C(
9a austenita resenta las siguientes caracter!sticas+
*aa temeratura de "usión. *aa tenacidad. E6celente soldabilidad. $o es magn5tica.
Carono dis5elto en$ierro 6 es 5na sol5!inslida intersti!ial en 5na
red +CC
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9a austenita está "ormada or cristales c;bicoscentrados en las caras estructura (##).
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La máxima solubilidad es
,!!" de # a $!$%#, y
disuel&e sólo ,'" de #
a temperatura ambiente.
<icroestructura interna de la "errita
Carono dis5elto en $ierro' Es 5na sol5!in slida
intersti!ial en 5na red 8CC
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e "orma cementita (e#) cuando se e6cede el l!mite desolubilidad del carbono en "errita = or debao de 2># (lacomosición está comrendida en la región de "ases =?e#).9a cementita, desde el unto de vista mecánico, es dura y"rágil, y su resencia aumenta considerablemente laresistencia de algunos aceros.
9a cementita se resenta de "orma oscura al ser observada almicroscoio, Estrictamente hablando, la cementita es sólometaestable@ esto es, ermanece como comuesto atemeratura ambiente inde"inidamente. ero si se calienta
entre -70 y 00># durante varios aos, cambia gradualmenteo se trans"orma en hierro = y carbono, en "orma de gra"ito, &ueermanece al en"riar hasta temeratura ambiente.
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9as 'onas oscuras corresonde a cementita &ue es el mayorconstituyente en la "undición blanca, las 'onas clarascorresonden a erlita.
9a cementita osee las siguientes roiedades+
<icroestructura interna de la cementita
A9BA4CDEA
<CFDGHI9
A9BA DEIBE$#IA A94EHABE
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<icroestructura interna de la ledeburita
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9a ledeburita se "orma al en"riar una "undición l!&uida decarbono (de comosición alrededor del 3.% de #) desde
0#, siendo estable hasta 2#, descomoni5ndose aartir de esta temeratura en "errita y cementita. Está "ormadaor 72% de cementita y 38% de austenita.9a ledeburita no e6iste a temeratura ambiente en las"undiciones ordinarias debido a &ue en el en"riamiento se
trans"orma en cementita y erlita@ sin embargo en las"undiciones se uede conocer las 'onas donde e6istió laledeburita or el asecto eut5ctico con &ue &uedan lasagruaciones de erlita y cementita.
htt+JJocK.ucm.esJcienciaLeLoinJ&uimicaLdeLlosLmaterialesJ<aterialLdeLclaseJtema
L-.LmaterialesLmetalicosLceramicosLyLolimerosLiJsMinlessNvieK
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E9 DA;AMA $E;;< CA;8<N< .ENE 9<, ,EN.E,PN.<, C;/.C<,
a( P5nto perit=!ti!o:01> C ? 14"3 C
( P5nto e5t=!ti!o:43 C ? 1147 C
!( P5nto e5te!toide:
0# C ? 723 C
γ δ ⇔+ líquido
C Fe Líquido3
+⇔ γ
C Fe3
+⇔α γ
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γ δ ⇔+ doacerolíqui
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C Feíquida FundicionL3
+⇔ γ
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Acero es la denominación &ue com;nmente se le da, en
ingenier!a metal;rgica, a una aleación de hierro con unacantidad de carbono variable entre el 0,08% y el ,-% en esode su comosición, deendiendo del grado.
$o se debe con"undir el acero con el hierro, &ue es un metalrelativamente duro y tena', con temeratura de "usión de .77># y unto de ebullición 2.30 >#.
El acero conserva las caracter!sticas metálicas del hierro enestado uro, ero la adición de carbono y de otros elementostanto metálicos como no metálicos meora sus roiedades
"!sicoL&u!micas. El acero es actualmente la más imortantealeación mecánica emleándose de "orma intensiva ennumerosas alicaciones como bienes de e&uio (má&uinaLherramienta), construcción, etc.
ACERO
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CLASIFICACION DE
LOS ACEROS
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H I P O E U T E C T O I
D E
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C O
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EUTECTOIDE
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H I P E
R E U T
E C T O
I D E
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DEFINICIÓN: ALEACIÓN HIERRO-CARBONOO SUSTANCIAS OBTENIDAS POR FUSIÓN DEL
Fe , C e IMPUREZAS
O C DISUELTO ( Feα, Feγ)O C COMBINADO (Feз C ceme!"!#)O C LIBRE (LAMINAS, NODOS)
DEFINICIÓN ACERO: ALEACIÓN Fe-C $%&O HIPOEUTECTOIDE C$'-&O EUTECTOIDE C'*&O HIPEREUTECTOIDE C+'*&
DEFINICIÓN FUNDICIÓN: Fe %&$C$*&O HIPEREUTECTICA C+.*/&O HIPOEUTECTICA C$.*/&O EUTECTICA C.*/&
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O FERRITA (α 0 1) SOLUCIÓNSÓLIDA DE INSERCIÓN DE C ENFe α* SOLUBILIDAD M23IMA
'*'%&* Fe PURO* BLANDA* BCC
O FERRITA 4 SOLUCIÓN SÓLIDAINTERSTICIAL DE C EN Fe 4*BCC* SOLUBILIDAD M23IMA
'*'5&*
O CEMENTITA: FeзC , ,,& C*DURO 6 FR27IL* SISTEMAORTORÓMBICO
COMPONENTESESTRUCTURALES DE LOS
ACEROS
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O PERLITA: MEZCLA EUTECTOIDEFERRITA 6 CEMENTITA * '*&C*L2MINAS ALTERNADAS
O AUSTENITA: SOLUCIÓN SÓLIDAINSERCIÓN DE C EN Feγ* SEDESDOBLA POR REACCIÓNEUTECTOIDE* SOLUBILIDAD
M23IMA %,88&
O LEDEBURITA: MEZCLAEUTECTICA DE CEMENTITA 6AUSTENITA .,/&C
COMPONENTESESTRUCTURALES DE LOS
ACEROS
ANALISIS EN EL
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ANALISIS EN EL
DIAGRAMA Fe-C
PN.<,: 04C 3#C
3C
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040 3#0 30 A
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0.30
AN
B
9,,
D
E 9DA
:;AM
A
+e- C
A9P
N.<
04
C
A
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0.30
0 1 #
0.
ANB9
, ,DE9
DA:
;AMA
+e-
C
A9PN
.<0
4
C
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ANB9,, DE9 DA;AMA +e C
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ANB9,, DE9 DA;AMA +e-CA9 PN.< 04C
ANB9,, DE9 DA;AMA +e C
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ANB9,, DE9 DA;AMA +e-CA9 PN.< 04C
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Ferrita 42.57%Cee!t
itaE"te#t$
ie
5.4&%
Per'ita4&.(5 %
ANB9,, DE9 DA;AMA +e C
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B># B %eP
%Acero9i&.
e P
Q#R
Acero9i&. Q#R
703 B 0 00 0.0 0.30318 B2 1.01 10.1 0. 0.33
313 B 22.22 .8 0.2 0.38
B># B %Aust. %Acero 9i&. AustenitaQ#R
Acero 9i&.Q#R
38 B3 -8.1 .0 0. 0.-0
3- B7 00 0 0.30 0.8
ANB9,, DE9 DA;AMA +e-CA9 PN.< 04C
># % %
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B># B %Aust. %errita AustenitaQ#R
erritaQ#R
11 B- 00 0 0.30 0.020
B 82.32 .78 0.38 0.027
- B8 7-.1 3.8 0.-1 0.028
2 B1 38.07 7.17 0.80 0.00
Ferrita 42.57%
Cee!titaE"te#t$
ie
5.4&%
Per'ita
4&.(5 %
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C;A DE EN+;AMEN.<
P.< 04C
errita
#ementitaEutectoide
errita
Perlita
9i&uido
A
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.8 .38
4 3
2.
0 #
AN
B
9,,
D
E 9DA
:;AM
A
+e- C
A9P
N
.<3#
C
ANB9,, DE9 DA;AMA +e-C
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ANB9,, DE9 DA;AMA +e-CA9 PN.< 3#C
ANB9,, DE9 DA;AMA +e-C
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ANB9,, DE9 DA;AMA +e-CA9 PN.< 3#C
ANB9,, DE9 DA;AMA +e-C
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ANB9,, DE9 DA;AMA +e-CA9 PN.< 3#C
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B># B und. 9i&.Q#R
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GRACIAS…
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S ) e a) e ea# $ e) " /# #a)Bi!aria)E01 P*-S!
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Referencias Bibliográficas:
htt+JJocK.ucm.esJcienciaLeLoinJ&uimicaLdeLlosLmaterialesJ<aterialLdeLclaseJtemaL-.Lmater ialesLmetalicosLceramicosLyLolimerosLiJsMinlessNvieK