DYNAMIC RECOVERY AND RECRYSTALLIZATION IN A COLD-ROLLED ULTRA-LOW CARBON-STEEL PLATE - A NEUTRON AND X-RAY-DIFFRACTION STUDY

The cold rolling of ultra low carbon steel is a complex process involv ing the formation of texture and the development of residual stresses. The mechanism for both texture and residual stress development is dis location multiplication. Both texture and residual stresses can be det ermined by means of neutron and X-ray diffraction. In this paper, resu lts of such measurements on a cold rolled plate (final thickness 10 mm ) are presented along with theoretical predictions based on finite ele ment calculations of the residual stress state. The results show that during cold rolling not only the formation and multiplication of dislo cations play a role. It is seen that besides the creation of dislocati ons, two dislocation annihilation processes are involved, namely recov ery and recrystallization. These happen despite the fact that the cold rolling takes place at relatively low temperatures (20 < T < 150 degr ees C).