The Iron-Iron Carbide Phase Diagram. Heat Treatment of Steel. Features. Phases present. L. a ferrite Bcc structure Ferromagnetic Fairly ductile. d Bcc structure Paramagnetic. g austenite Fcc structure Non-magnetic ductile. Fe 3 C cementite Orthorhombic Hard brittle. Reactions.
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Heat Treatment of Steel
Peritectic L + d = g
Max. solubility of C in ferrite=0.022%
Max. solubility of C in austenite=2.11%
Eutectic L = g + Fe3C
Eutectoid g = a + Fe3C
Steel is an interstitial solid solution of carbon in iron.
Theoretically steel has a maximum of 2.11% carbon.
In practice, the amount of carbon rarely exceeds 0.8%
Low carbon steels up to 0.2%C
Medium carbon steels 0.2-0.4%C
High carbon steels >0.4% C
Last two numbers indicate
Amount of carbon :0.2%C
10 indicates plain carbon steel
AISI 4340: 0.4%C
43 indicates alloy steel