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Metals 2016, 6(12), 321; doi:10.3390/met6120321

The Effect of Ultrafast Heating on Cold-Rolled Low Carbon Steel: Formation and Decomposition of Austenite

1
Department of Materials Science and Engineering, Ghent University, Technologiepark 903, Gent 9052, Belgium
2
Department of Metallurgical Engineering, Universidad de Santiago de Chile, Av. Lib. Bdo. O´Higgins 3363, Estación Central, Santiago 9170022, Chile
3
School of Mining & Metallurgical Engineering, Division of Metallurgy and Materials, 9, Her. Polytechniou str., Zografos-Athens GR-157 80, Greece
4
Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, Delft 2628CD, The Netherlands
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 11 November 2016 / Revised: 5 December 2016 / Accepted: 8 December 2016 / Published: 19 December 2016
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Abstract

The effect of heating rate on the formation and decomposition of austenite was investigated on cold-rolled low carbon steel. Experiments were performed at two heating rates, 150 °C/s and 1500 °C/s, respectively. The microstructures were characterized by means of scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD). Experimental evidence of nucleation of austenite in α/θ, as well as in α/α boundaries is analyzed from the thermodynamic point of view. The increase in the heating rates from 150 °C/s to 1500 °C/s has an impact on the morphology of austenite in the intercritical range. The effect of heating rate on the austenite formation mechanism is analyzed combining thermodynamic calculations and experimental data. The results provide indirect evidence of a transition in the mechanism of austenite formation, from carbon diffusion control to interface control mode. The resulting microstructure after the application of ultrafast heating rates is complex and consists of a mixture of ferrite with different morphologies, undissolved cementite, martensite, and retained austenite. View Full-Text
Keywords: ultrafast heating; massive; austenite; diffusion control; low-carbon steel; texture memory ultrafast heating; massive; austenite; diffusion control; low-carbon steel; texture memory
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Castro Cerda, F.M.; Schulz, B.; Papaefthymiou, S.; Artigas, A.; Monsalve, A.; Petrov, R.H. The Effect of Ultrafast Heating on Cold-Rolled Low Carbon Steel: Formation and Decomposition of Austenite. Metals 2016, 6, 321.

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