RECRYSTALLIZATION AND SIGMA PHASE FORMATION AS CONCURRENT AND INTERACTING PHENOMENA IN 25%Cr-20%Ni STEEL.

Abstract

The activation energy for recrystallization was 4. 6 multiplied by 10**5 J/mol which was greater than values observed in steel. A sigma phase formation accompanied the recrystallization phenomenon, and this transformation acted as a barrier for growth of recrystallized grains. The formation and recrystallization are concurrent; hence the activation energy is a sum of those for recrystallization, 2. 3 multiplied by 10**5 J/mol, and for diffusion of chromium atoms, 2. 3 multiplied by 10**5 J/mol.