- Carburization -

Definition:

A high-temperature corrosion phenomenon caused by carbon ingress from the environment into metal components, leading to internal carbide precipitation and changes to the mechanical properties of the materials.

Grabke, H. J. Carburization: A High Temperature Corrosion Phenomenon. MTI, 1998.

Mechanism:
• C/CO transport to the steel surface
• C diffuses into the surface
• Solid state reaction with Fe in steel
  • Fem + Cn Þ FemCn

Consequences:
• Phase-change stresses
• Altered ductile properties, grain cohesion
• MP-lowering: TM~1800K Þ TM򒶜K
• Metal Dusting: disintegration of the steel in a dust of metal particles and C

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