Transformation plasticity (TP) occur during heat treatment process due to the applied of external stress on steel. The thermo-mechanical behavior of materials undergoing a solid-solid phase transformation has been largely investigated by many researchers but the exact phenomenon of transformation under different austenitization conditions is still not clear. Boudiaf et al. have investigated the influence of tensile-torsi onal and only tensile systems on martensite transformation at different austenitization temperatures. The tensile-torsional system results show that under uniaxial torsional loading, transformation plasticity is independent of the prior austenite grain size (AGS), but in the uniaxial tensile loading case, it is increasing function of the AGS. Under only tensile loading tests, martensite transformation generated different transformation plastic deformations. In addition, previously the effect of austenitic conditions for pearlite transformation studied with three-point bending system. The results show that the TP deflection decreased by increases of austenitization temperature or holding time.
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