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The dynamic transformation of austenite to ferrite at temperatures above the Ae3 temperature was first investigated by Yada and co-workers in the late 1980s. This phenomenon has now been observed right up to the delta ferrite formation temperature. The basic principles of dynamic transformation are reviewed, together with recent advances in the understanding of this mechanism. The transformation product...
Recent observations regarding the dynamic transformation of deformed austenite at temperatures above the Ae 3 are reviewed. Experimental results obtained on four different steels over the temperature range from 743 to 917°C and at strains up to ε=5 are described. It is shown that there is a critical strain for the formation of superequilibrium ferrite and that the volume fraction of transformed...
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