STUDY ON THE REFINEMENT OF THE RECRYSTALLIZED GRAIN SIZE OF 3S ALLOY (PART 3)

INFLUENCE OF PREHEATING OF COLD WORKED SHEET

Abstract

Influence of preheating of cold worked sheet on the recrystallized grain size of 3S alloy has been studied. The result as follows:
(1) For 3.3m/m (reduction 46%) Sheet, the recrystallized grain becomes finer, within 600°and 15hrs, with the increases of preheating temperature and time.
(2) As the cold working is given hardly before preheating, the preheating temperature and time, resalting in the minimum recrystallized grain size, change to the lower or shorter side.
(3) The more the cold working after preheating is hard, the more the recrystallized grain size is small.
(4) With the decrease in cooling rate after preheating the grain refinement is remarkable.
(5) Comparing the results, it is considered that in the practical operation the cold working before preheating following the faster precipitation of dispersoid will be much more effective for the recrystallized grain refinement than that after preheating.