The effect of ultrafast heating on cold-rolled low carbon steel

The effect of ultrafast heating on cold-rolled low carbon steel: Formation and decomposition of austenite

Castro Cerda, F. (Universiteit Gent; Universidad de Santiago de Chile)
Schulz, B. (Universidad de Santiago de Chile)
Papaefthymiou, S. (School of Mining & Metallurgical Engineering)
Artigas, A. (Universidad de Santiago de Chile)
Monsalve, A. (Universidad de Santiago de Chile)
Petrov, R.H. (TU Delft (OLD) MSE-3; Universiteit Gent)

2016

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.

Austenite
Diffusion control
Low-carbon steel
Massive
Texture memory
Ultrafast heating

http://resolver.tudelft.nl/uuid:2f93aefe-c15e-4883-8d7a-7acce44bc983

https://doi.org/10.3390/met6120321

2075-4701

Metals, 6 (12)

Institutional Repository

journal article

© 2016 F. Castro Cerda, B. Schulz, S. Papaefthymiou, A. Artigas, A. Monsalve, R.H. Petrov