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HeatTreatment of Steel
Features
Peritectic L + δ = γ
Eutectic L = γ + Fe3C
Eutectoid γ = α + Fe3C
Phases present
L
Reactions
δ
Bcc structure
Paramagnetic
γ austenite
Fcc structure
Non-magnetic
ductile
α ferrite
Bcc structure
Ferromagnetic
Fairly ductile
Fe3C cementite
Orthorhombic
Hard
brittle
Max. solubility of C in ferrite=0.022%
Max. solubility of C in austenite=2.11%
Microstructures
α γ
Steels
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%
Classification/Nomenclature
Low carbon steels up to
0.2%C
Medium carbon steels 0.2-0.4%C
High carbon steels >0.4% C
AISI 1020:
Last two numbers indicate
Amount of carbon :0.2%C
10 indicates plain carbon steel
AISI 4340: 0.4%C
43 indicates alloy steel
Eutectoid steel
Hypoeutectoid steel
Hypereutectoid steel
KEEP SMILING
MADHUR
KEEP SMILING
MADHUR

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Iron carbon diagram by madhur mahajan

  • 2.
  • 3. Features Peritectic L + δ = γ Eutectic L = γ + Fe3C Eutectoid γ = α + Fe3C Phases present L Reactions δ Bcc structure Paramagnetic γ austenite Fcc structure Non-magnetic ductile α ferrite Bcc structure Ferromagnetic Fairly ductile Fe3C cementite Orthorhombic Hard brittle Max. solubility of C in ferrite=0.022% Max. solubility of C in austenite=2.11%
  • 5. Steels 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% Classification/Nomenclature Low carbon steels up to 0.2%C Medium carbon steels 0.2-0.4%C High carbon steels >0.4% C AISI 1020: Last two numbers indicate Amount of carbon :0.2%C 10 indicates plain carbon steel AISI 4340: 0.4%C 43 indicates alloy steel