#pearlite  a lamellar mixture of cementite and ferrite formed during the cooling of austenite; a micro-constituent of steel and cast iron
  supertype:  lamellar_mixture  a mixture in which substances occur in distinct layers
  substance:  cementite  ferrite
  substance of:  cast_iron  steel
  subtype:  granular_pearlite__globular_pearlite  if steel or iron cool very slowly the cementite may occur in globules instead of in layers

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