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The Iron-Iron Carbide Phase Diagram Heat Treatment of Steel

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Page 1: The Iron-Iron Carbide Phase Diagram Heat Treatment of Steel

The Iron-Iron Carbide Phase Diagram

Heat Treatment of Steel

Page 2: The Iron-Iron Carbide Phase Diagram Heat Treatment of Steel
Page 3: The Iron-Iron Carbide Phase Diagram Heat Treatment of Steel

Features

Peritectic L + =

Eutectic L = + Fe3C

Eutectoid = + Fe3C

Phases present L

Reactions

Bcc structureParamagnetic

austeniteFcc structureNon-magneticductile

ferriteBcc structureFerromagneticFairly ductile

Fe3C cementiteOrthorhombicHardbrittle

Max. solubility of C in ferrite=0.022%

Max. solubility of C in austenite=2.11%

Page 4: The Iron-Iron Carbide Phase Diagram Heat Treatment of Steel

Microstructures

Page 5: The Iron-Iron Carbide Phase Diagram Heat Treatment of Steel

SteelsSteel 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/NomenclatureLow 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 indicateAmount of carbon :0.2%C10 indicates plain carbon steelAISI 4340: 0.4%C43 indicates alloy steel

Page 6: The Iron-Iron Carbide Phase Diagram Heat Treatment of Steel

Microstructural changes in steel on cooling for different compositions

Page 7: The Iron-Iron Carbide Phase Diagram Heat Treatment of Steel

Eutectoid steel

Page 8: The Iron-Iron Carbide Phase Diagram Heat Treatment of Steel

Hypoeutectoid steel

Page 9: The Iron-Iron Carbide Phase Diagram Heat Treatment of Steel

Hypereutectoid steel


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