Ultra-High Purity Metals. II. Influence of Carbon Additions on the Dynamic Recrystallization of High Purity .ALPHA.-Iron.

The influence of carbon content on the dynamic recrystallization mode of alpha-Iron containing various amounts of carbon, ranging from 5 to 200 ppm, was investigated. Uniaxial compression tests were carried out, followed by metallographic analyses by optical microscopy. All the alloys exhibit discontinuous dynamic recrystallization. Furthermore, the values of the apparent activation energies of deformation, as well as the steady state average grain sizes show that they are very sensitive to carbon additions in the range of high purities, i.e. 0-50 ppm. An interpretation of this effect is proposed on the basis of grain boundary solute segregation.