Effects of the austenite grain size on transformation plasticity in a 35 NCD 16 steel Online publication date: Mon, 20-Dec-2010
by Achraf Boudiaf, Lakhdar Taleb, Mohamed El Amine Belouchrani
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 5, No. 4/5, 2010
Abstract: In this work, the influence of the austenitic grain size (AGS) on the transformation induced plasticity (TRIP) was experimentally studied. The study was undertaken in the case of the martensitic transformation of a 35NCD16 steel. Transformation induced plasticity tests (TRIP tests) were carried out under various conditions of austenitisation leading to different grain sizes of austenite. Two studies have been performed leading to different observations. In the first study, where the heating rate during austenitisation was relatively fast (50°C/s), the results seem indicate that the transformation induced plasticity is higher when the austenitic grain size is smaller (Boudiaf et al., 2008). In the second study we have considered a slower heating rate during austenitisation (0.5°C/s) on specimens manufactured from another batch of the same steel. Different results were then obtained where TRIP increases slightly with the grain size. However, the uncertainties pointed out in assessing TRIP incite to be more careful. The work is still in progress in order to clarify the observed difference evaluating in particular the role of the heating rate during the austenitic transformation.
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