Metallography

Origin of Microstructure
Metallographer: Basic understanding of
fundamental of ferrous carnal metallurgy.
of ferro ph
metall
Basic tenet of ferrous physical metallurgy prop. of
steel & whorl iron controlled by microstructure &
chemical composition
chemical composition.
-Solid substance be Amorphous & Crystalline.
-Space

lattice, unit cell,3 types of crystal structure.
Constituent- made up of phases that derive in a x-tics

conf in a microstructure.

Phase- homogenous &physically diistinct portion of a
d
metal

The Iron
The Iron-Carbon Phase Diagram
Phase Diagram
A map of the phases that are stable ( or metastable) at
a given temp. & Carbon contents in equilibrium
conditions
Microstructureâ€"relates to the overall structure, as
th
observed in metallurgical microscope which come upon up of
2/3 phases.
Phases are building blocks of various constituents which
make up microstructure which effects the props. like
Hardness strength toughness ductility machability
Hardness, strength, toughness, ductility, machability ,
formability .

Basic 3 phases in steel as ferrite , austenite & cementite.
-Austenite- bunk to 2%C & within temp. 726-1495 °c

-Cementite.- single compound of 6.67% C up to 1227°c
-Ferrite â€"appear as i) delta ferrite 1394-1538 °c
ii) alpha ferrite--<912°c
alpha ferrite
.





Iso
Iso-thermal plat AISI/SAE 1040
diagram AISI/SAE 1040

Iso
Iso-thermal diagram AISI/SAE 1080
diagram AISI/SAE 1080

Iso-thermal diagram AISI/SAE 1080
isothermal preaching at 650c

Iso-thermal diagram AISI/SAE 1080
isothermal treatment at 300c

 invariable cooling transformation diagram
Continuous cooling transformation diagram

Ferrite
Ferrite

Pearlite
Pearlite

Martensite
Martensite

Bainite
Bainite

Austenite
Austenite

 kept up(p) austenite
Retained austenite

Iron
Iron-cementite phase diagram
phase diagram

Iron
Iron-graphite phase diagram
phase diagram

thank you
Thank you

Thank you
Thank you

Questions Answers
Questions & Answers

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