Abstract
The tailor rolled blank of dual phase steel (DP-TRB) is benefit for light weight of automobiles, and contribute to the energy conservation and emission reduction of the auto industry. Two kinds of annealing process, austenitizing completely followed by cooling to intercritical temperature and intercrit ical annealing, is studied. In intercritical annealing, an inflection point inmechanical property is found at 1.5mm thickness zone (25% rolling reduction) and has big property difference between different thickness es. In the process of complet ing austenitizing followed by cooling to intercrit ical temperature, the homogenized mechanical property is shown and the difference in strength between thicknesses is 20MPa. And in this process, the influence of rolling is totally eliminated. These results can guide industrial production.
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