Abstract
Auger electron microscopic analyses were performed to clarify the grain boundary segregation behavior of phosphorus and carbon in the austenitic region of steel. Grain boundary migration during grain growth and recrystallization gave rise to non-equilibrium segregation which resulted in a higher solute concentration on grain boundaries than that of equilibrium segregation. The increment of segregation caused by migration depended on the boundary migration velocity. Faster migration brought about greater concentrations for velocities less than a critical value, which depended on the diffusivity of solute. In recrystallization, faster diffusing elements such as carbon segregated with higher concentrations. It was suggested that the solute sweep effect during grain boundary migration caused the non-equilibrium segregation.
