the iron-iron carbide phase diagram heat treatment of steel
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The Iron-Iron Carbide Phase Diagram
Heat Treatment of Steel
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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%
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Microstructures
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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
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Microstructural changes in steel on cooling for different compositions
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Eutectoid steel
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Hypoeutectoid steel
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Hypereutectoid steel