Abstract
The influence of the heating rate on the recrystallization kinetics and the as-recrystallized grain size has been studied for the case of heavily cold-drawn 70/30 brass. Samples have been continually reheated in muffle and induction furnaces to give heating rates between 0.18 and 180° C sec−1 and the progress of recrystallization followed by hardness and microscopy techniques. Recrystallization started at about 240° C and finished at about 320° C at the slowest heating rate: these temperatures were increased to about 340° C and 380° C, respectively, when the heating rate was increased to 180° C sec−1. At the same time, the hardness measurements indicated that the as-recrystallized grain size decreases from about 1.4 μm to about 0.8 μm. The results are discussed in relation to the normal recrystallization heat-treatments and the possibility of obtaining a temporary superplastic behaviour.
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