Abstract
The isothermal transformation of ferrite to austenite in a carbon-free Fe-8.0 mass%Cr alloy at temperatures above A3 has been investigated quantitatively. The main results are as follows:(1) Austenite preferentially nucleates at ferrite grain boundary corners and grows with a constant velocity in all directions.(2) The nucleation sites are saturated in the early stage of transformation.(3) The isothermal transformation behaviour of austenite can be expressed by the Johnson-Mehl type equation, and the reaction exponents have a value about 3 for all transformation temperatures.(4) The kinetics are in good agreement with Cahn’s theory of grain boundary nucleated reactions.
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