Differing numbers and configurations of crystal defects were obtained in the austenite of an Fe-30%Ni alloy, and in an ultra-low C bainitic steel, by using various deformation and annealing treatments at high temperature. The segregation of B at grain boundaries and sub-grain boundaries, during air-cooling, was revealed by using particle-tracking autoradiographic techniques. It was found that B depletion was more extensive in recrystallized grains than in the original deformed grains during cooling. The sub-grain boundaries and polygonized dislocation cells had an appreciable effect upon B non-equilibrium segregation during air cooling, but the number of dispersed dislocations did not. The results indicated that, during segregation, the interaction of B atoms with dislocations was sensitive to the dislocation configuration rather than to the total number of defects in the grain.

Effect of Crystal Defects on Solute Atom Segregation during Cooling. H.Y.Cui, X.L.He: Journal of Materials Science, 2001, 36[24], 5909-15