Which Phase has complex orthorhomic crystal structure?

Discussion

• Sravanthi   -Posted on 21 Nov 15
  Cementite:
  
  - It has complex orthorhomic crystal structure which contains 12 iron atoms and 4 carbon atoms in each unit cell. Cementite is also called as iron carbide.
  
  - It is a hard and brittle phase which influences properties of steels and cast irons.
  
  - It is an inter-metallic compound of iron (93.3%) and carbon (6.67%).
  
  - In carbon steel, cementite forms from austenite when cooled and during tempering it forms from martensite.
  
  - Orthorhombic crystal structures are formed when cubic lattice is stretched along its orthogonal pairs. They have rectangular prism with a rectangular base and height which are distinct from each other and intersect at 90°.
  

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