Title: Discontinuous transformation in the steel under hot deformation conditions

Authors: Andrzej Stanislaw Nowotnik, Jan Michal Sieniawski, Grazyna Mrowka-Nowotnik

Addresses: Department of Materials Science, University of Technology, W. Pola 2 Street, Rzeszow 35-959, Poland. ' Department of Materials Science, University of Technology, W. Pola 2 Street, Rzeszow 35-959, Poland. ' Department of Materials Science, University of Technology, W. Pola 2 Street, Rzeszow 35-959, Poland

Abstract: Purposeful effect of hot deformation process and transformation – austenite (A) to ferrite (F) and to pearlite (P) – interaction on the carbon steel microstructure was studied. Hot compression tests at various strain rates were performed during controlled cooling of the sample within the temperature range related to the start and finish of the phase transformation. Attention was paid to structural effects of dynamic precipitation and resulted morphology of structural components depended on expected localisation of phase transformation. The findings of carbide precipitates development along ferrite grain boundaries was the most noticeable effect of the hot deformation and subsequent transformation for tested samples. However, the flow localisation and preferred growth of the discontinuous transformation product-pearlite at shear bands was very limited. [Received on 25 October 2006; Accepted on 21 February 2007]

Keywords: mechanical properties; electron microscopy; carbon steel; plastic forming; phase transformation; discontinuous transformation; hot deformation; microstructure; hot compression tests; strain rate.

DOI: 10.1504/IJMPT.2008.020590

International Journal of Materials and Product Technology, 2008 Vol.33 No.3, pp.305 - 321

Available online: 01 Oct 2008 *

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