The effect of thermomechanical treatment on the γ – α‐transformation in steel has been reviewed. It has been shown that the thermo‐mechanically conditioned austenite significantly influences the kinetics of transformation due to the differences in the formation of product phases. An enhanced nucleation during the diffusion controlled transformation, as a result of austenite grain refinement and/or austenite strengthening, leads to a substantial refinement of the microstructure (ferrite grains, pearlite nodules). The deformation substructure of austenite may strongly affect the shear mechanism of the diffusionless transformation, which leads to finely fragmented martensite crystals. Such differences in the transformation characteristics result in different formation temperatures of transformation products and so to the changes in CCT diagrams.
As a substantial subject of the work reviewing the effect of thermomechanical treatment (TMT) on the ,'/a-transformation of steel, this paper gives a survey of the metallurgical processes in the austenite as a consequence of hot deformation. These processes determine the properties of the austenite structure from which the transformation takes place. The dynamic and static recrystallization which refine the coarse grain formed during reheating are treated. For the case that at most minimal recrystallization occurs, the deformation structures arising from hot deformation are described under the aspect of their roll as nucleation sites for the ,'/a-transformation. EinfluB einer thermomechanischenBehandlung auf die Veranderung des Austenitgefiiges. Im· Rahmen einer Obersicht Ober den derzeitigen Kenntnisstand hinsichlich des Einflusses einer thermomechanischen Behandlung (TMB) auf die ,y/o:-Umwandlung werden die metallkundlichen Prozesse behandelt, die infolge der Warmumformung im Austenit ablaufen. Sie bestimmen die Eigenschaften des Austenitgetoges, aus dem die ,y/0:-Umwandlung ablauft. Sowohl die dynamische als auch die statische Rekristallisation, die das nach dem Warmen vorliegende grobe Korn verfeinern, sind Gegenstand der Diskussion. Fur den Fall einer geringfOgigen Rekristallisation werden die bei der Warmumformung gebildeten Verformungsstrukturen als Keimbildungsplatze tor die ,y/o:-Umwandlung beschrieben.
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