In the context of this work, the influence of stress superimposed to isothermal austenite-tobainiteand austenite-to-martensite phase transformations on the kinetics and the evolution oftransformation induced distortion was investigated. Thereby, the kinetics as well as the evolutionof distortion was examined at both the macro- as well as the mesoscopic level. The resultsdetermined within this work allowed for deriving several recommendations for the optimizationof thermo-mechanically coupled massive forming processes for the production offunctionally graded structures made from low alloy steel as well as for modeling of these processes.In particular it was found, that stress superimposed to phase transformations influences thetransformation kinetics significantly. In detail the total phase transformation time for thebainitic phase transformation was shortened and the martensite-start-temperature was higher,when a stress was superimposed. At the same time, stress leads to an anisotropic volumechange which causes distortion in the product, which is called transformation plasticity strain.Thereby, the evolution of transformation plasticity strain could be determined at the macroandat the mesoscopic level. For the latter case the strain distribution could be correlated withthe crystal orientations of the resulting microstructure, when the phase transformation wassuperimposed by a stress.