Title: On the effect of plasticity on the kinetics of the isothermal bainitic transformation

Authors: Hans-Gerd Lambers, Sergej Tschumak, Hans Jurgen Maier

Addresses: Lehrstuhl fur Werkstoffkunde (Materials Science), University of Paderborn, Pohlweg 47-49, 33098 Paderborn, Germany. ' Lehrstuhl fur Werkstoffkunde (Materials Science), University of Paderborn, Pohlweg 47-49, 33098 Paderborn, Germany. ' Lehrstuhl fur Werkstoffkunde (Materials Science), University of Paderborn, Pohlweg 47-49, 33098 Paderborn, Germany

Abstract: Forging processes are accompanied by large plastic deformations and residual stresses. Depending on the local cooling rate the deformed material typically is in the stable or the supercooled austenitic state. The results show that plastic deformation of the stable austenite does not accelerate the kinetics of the isothermal bainitic phase transformation whereas a pre-deformation of the supercooled austenite results in a pronounced acceleration of the phase transformation. In addition, deformation of austenite in its supercooled state leads to transformation plasticity whereas no transformation plasticity was observed after pre-straining of the stable austenite.

Keywords: phase transformation; bainite; microstructure; transformation plasticity; supercooled austenite; kinetics; orging processes are accompanied by large plastic deformation; residual stress; cooling rate; supercooling.

DOI: 10.1504/IJMMP.2010.037609

International Journal of Microstructure and Materials Properties, 2010 Vol.5 No.4/5, pp.328 - 337

Published online: 20 Dec 2010 *

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