The Iron-Iron Carbide Phase Diagram - In practice the...

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Heat Treatment of Steel The Iron-Iron Carbide Phase Diagram
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Features Peritectic L + d = g Eutectic L = g + Fe 3 C Eutectoid g = a + Fe 3 C Phases present L Reactions d Bcc structure Paramagnetic g austenite Fcc structure Non-magnetic ductile a ferrite Bcc structure Ferromagnetic Fairly ductile Fe 3 C cementite Orthorhombic Hard brittle Max. solubility of C in ferrite=0.022% Max. solubility of C in austenite=2.11%
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Microstructures a g
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Steels Steel is an interstitial solid solution of carbon in iron. Theoretically steel has a maximum of 2.11% carbon.
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Unformatted text preview: 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 Microstructural changes in steel on cooling for different compositions Eutectoid steel Hypoeutectoid steel Hypereutectoid steel...
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  • Spring '11
  • PERERA
  • High Carbon Steels, Low carbon steels, Max. solubility, Ferromagnetic Fairly ductile, Bcc structure Paramagnetic

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