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austenite

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Also known as gamma-phase iron, γ-Fe, gamma iron

thumb|right|250px|Iron-carbon phase diagram, showing the conditions under which austenite (γ) is stable in carbon steel. thumb|Allotropes of iron; alpha iron and gamma iron

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Austenite
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11 sections
Contents
  • Allotrope of iron
  • Material
  • Austempering
  • Behavior in plain carbon-steel
  • Behavior in cast iron
  • Stabilization at lower temperatures
  • Thin films
  • Transformation and Curie point
  • Thermo-optical emission, colour indicates temperature
  • See also
  • References

thumb|right|250px|Iron-carbon phase diagram, showing the conditions under which austenite (γ) is stable in carbon steel. thumb|Allotropes of iron; alpha iron and gamma iron

Austenite, also known as gamma-phase iron (γ-Fe), is a metallic, non-magnetic allotrope of iron or a solid solution of iron with an alloying element. In plain-carbon steel, austenite exists above the critical eutectoid temperature of 1000 K (727 °C); other alloys of steel have different eutectoid temperatures. The austenite allotrope is named after Sir William Chandler Roberts-Austen (1843–1902). It exists at room temperature in some stainless steels due to the presence of nickel stabilizing the austenite at lower temperatures.

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