The DAFT (deformation assistant ferrite transformation) of austenite and reverse DIFT (deformation induced ferrite transformation) during isothermal holding after deformation were investigated by means of hot deformation simulator with laser dilatometer. It is found that the reverse DIFT can occur in a wide temperature region, from the temperature above Ae3 to below A r3. However, during the isothermal holding, the reverse DIFT and DAFT of austenite take place, and therefore, the volume variation during holding time may be the combined effect of both phase transformations mentioned above. Nevertheless, the total volume and then the phase volume fraction change slowly, especially at lower holding temperature.
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