The density, arrangement and nature of dislocations, and the size of coherently diffracting particles, were measured by analysing X-ray diffraction line profiles for the steel. The specimens were cold-rolled to up to 90% strain, and annealed at various temperatures. It was shown that lattice orientation-dependent measurements could be performed if the sample was carefully oriented in a diffractometer. During annealing, the particle size was first found to decrease slightly, before subsequently increasing. This was attributed to the formation of low-angle tilt boundaries. It was noted that the dislocation density (and associated stored energy) was greater for the F{111}<112> orientation than for the A{100}<110> orientation. The F-orientation also contained more dislocations of screw-type and therefore recovered at a lower temperature than did orientation-A.

Orientation Dependent Intragranular Stored Energy in Polycrystalline Ti-IF Steel. O.Castelnau, T.Ungár, A.Miroux, T.Chauveau, B.Bacroix: Materials Science Forum, 2000, 321-324, 720-5