Journal of Heat Treating

, Volume 4, Issue 2, pp 167–176 | Cite as

The effect of segregation on the formation of austempered ductile iron

  • J. M. Schissler
  • J. Saverna


Alloy segregation at the solidification cell boundaries can have a very important influence upon the kinetics of the bainite reaction. The two stages usually observed in a homogeneous matrix after isothermal holding in the range of temperatures 350 to 450 °C can be described as follows: 1 -γ→ (α) + (γ); 2-(α) + (γ) → α + silicocarbides. These reactions are functions of the elements in solution in the matrix. For this reason, segregated elements affect very sensitively the evolution of the two basic reactions. The solidification cell boundaries are often not completely transformed to bainite, which explains the presence of martensite observed in these areas. The influence of the size of the solidification cells has also been studied. The austenitization conditions are also very important. At the opposite extreme, the bainitic reaction of the matrix located along the graphite interface evolves more quickly than that observed in the matrix or at the cell boundaries.


Ferrite Austenite Martensite Bainite Pearlite 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© American Society for Metals 1985

Authors and Affiliations

  • J. M. Schissler
    • 1
  • J. Saverna
    • 1
  1. 1.Ecole des Mines Parc de SauruptLaboratoire de M’etallurgie associ’e au CNRS U.A. 159Nancy CedexFrance

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