p untos i nvariantes eutéctico (funde fácil): l -> s1 + s2 peritéctico (funde alrededor): s1...
TRANSCRIPT
PUNTOS INVARIANTES
Eutéctico (funde fácil): L -> S1 + S2
Peritéctico (funde alrededor): S1 + L -> S2
Monotéctico: L1 -> L2 + S
Peritectoide: S1 + S2 -> S3
Eutectoide: S1 -> S2 + S3
Punto de Fusión Congruente: L -> S
Punto de Transformación Congruente:
S1 -> S2
EJEMPLO: CU - SN
1. Peritéctico: L+Cu ->
2. Peritéctico: L+ ->
3. PTE ->
4. Eutectoide: -> Cu5. Eutectoide: -> + Cu
12
6
34
56. Peritéctico: L+ ->
A 300 °C y una composición de 50% Sn, ¿cuáles son las fases presentes y en qué cantidades?
Phase equilibria in the Fe-C system
+ Fe3C +
+ Fe3C
912
T(ºC)
727
wt% C0.02 0.776.69
Fe3C
A1
A3
Acm
What type of invariant
reaction is this?Eutectoid
Nucleation and growth
C1
Let’s consider the cooling of a single phase austenite through the intercritical regime.
C1
Nucleation and growthLet’s consider the cooling of a single phase austenite through the intercritical regime.
C1
Nucleation and growthLet’s consider the cooling of a single phase austenite through the intercritical regime.
C1
Nucleation and growthLet’s consider the cooling of a single phase austenite through the intercritical regime.
C1
Nucleation and growthLet’s consider the cooling of a single phase austenite through the intercritical regime.
C1
Nucleation and growthLet’s consider the cooling of a single phase austenite through the intercritical regime.
C1
Nucleation and growthLet’s consider the cooling of a single phase austenite through the intercritical regime.
+Fe3C
C1
Nucleation and growth
Now we examine a similar case for a higher carbon content.
When we cross the A1, the remaining austenite transforms to a two-phase product of and Fe3C, known as pearlite.