The aim of the present work is to study the microstructure evolution of a cold-rolled low carbon steel alloyed with Cr, Mn, Mo, and Nb during continuous heating. The formation of austenite and its further transformation is examined by means of peak annealing experiments at three different heating rates, followed by quenching. The effect of carbide-forming alloying elements in the kinetics of austenite formation and decomposition is discussed with the aim of DICTRA calculations. Electron Probe Micro Analysis allows the detection of small compositional fluctuations within the microstructure, which are responsible for local changes in the mechanism of austenite formation. It is experimentally demonstrated that the temperature dependence of the austenite fraction is relatively insensitive to the heating rate. It is suggested that carbide-forming alloying elements slow down the kinetics of austenite formation.
|Number of pages||11|
|Journal||Steel research international|
|Early online date||3 Apr 2018|
|Publication status||Published - Jan 2019|
- Ultrafast heating