Effect of deformation on the austenite-to-ferrite transformation in a plain carbon and two microalloyed steels

From National Research Council Canada

DOI	Resolve DOI: https://doi.org/10.1007/BF02649255
Author	Search for: Essadiqi, E.¹; Search for: Jonas, J. J.
Affiliation	National Research Council of Canada
Format	Text, Article
Subject	ferrite; austenite; metallurgical transaction; flow curve; nucleation rate
Abstract	Isothermal compression tests were carried out on three steels: (i) a plain C, (ii) a Mo, and (iii) a Mo-Nb-V microalloyed grade in order to study the effect of deformation on the austenite-to-ferrite transformation. Dynamic TTT (DTTT) curves were determined, which show clearly the extent to which deformation accelerates the decomposition of austenite. The latter effect is diminished by the addition of the alloying elements Mo, Nb, and V and is further reduced as the temperature is increased. The substitutional elements Mo, Nb, and V appear to reduce the nucleation rate through reduction of the austenite grain boundary energy. The growth rate is also reduced by these elements, apparently through the solute drag-like effect. The microstructural results indicate that the ferrite formed under dynamic conditions becomes more homogeneous and finer when the strain rate or the temperature is increased. Under static conditions, increasing the prestrain or the prestraining strain rate accelerates the γ-to-α transformation and reduces the mean grain size of the ferrite, although the highest transformation rate is still associated with the dynamic case.
Publication date	1988-03-01
Publisher	Springer
In	Metallurgical Transactions A 19, no. 3: 417–426.
Language	English
Peer reviewed	Yes
NRC number	CNRC 26839 NRC-IGM87AP-000-511-G
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Record identifier	5ce1a8a2-cd14-417f-b3c9-9066df632895
Record created	2019-11-22
Record modified	2020-03-17

Date modified:: 2024-07-25