INFLUENCE OF STORED ENERGY IN COLD ROLLED SHEET ON THE FORMATION OF AUSTENITE DURING THE SUBSEQUENT INTERCRITICAL ANNEALING OF V-BEARING DUAL-PHASE STEELS

摘要

Recent research has shown an important relationship between the stored energy of the hot band, the increase in stored energy in cold rolling and the formation of austenite during intcrcritical annealing of V-bearing DP 980 steels. The stored energy is measured by combining SEM/FEG/EBSD with newly developed software that sums the subgrain boundary energy in the steel. The higher amounts of austenite found in cold band of higher stored energy leads to higher strength in the fully CGL processed steels. Current research is studying whether the observed effect is based in thermodynamics, kinetics or both. Both the technique itself and its application in this program will be presented and discussed. The effect of higher stored energy of the cold band on the final properties after full CGL process simulation will also be shown.