|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Steels
||PAN-63: Kinetic Study of the Austenite Decomposition during Continuous Cooling in a Welding Steel
||Octavio Vázquez-Gómez, Edgar López-Martínez, Alexis Iván Gallegos-Pérez, Heber Santoyo-Avilés, Héctor Javier Vergara-Hernández, Bernardo Campillo
|On-Site Speaker (Planned)
The kinetics of austenite decomposition during the continuous cooling in a low-carbon welding steel was determined by dilatometric analysis. Based on the measurements, the transformation critical temperatures of austenite decomposition were determined in ferrite and pearlite. The cooling conditions were established from the Stelmor® controlled cooling process for the manufacturing of wire rod. It was observed that the critical temperatures decrease while time was reduced as a result of the cooling rate in an interval of 600 to 900 °C. Using the decomposition temperatures, a continuous cooling transformation CCT diagram was created and it is observed that austenite decomposition occurs in two steps. The kinetic parameters for each step were determined and compared with the Johnson-Mehl-Avrami-Kolmogorov diffusive model. The final microstructure was analyzed using an optical microscope and evaluated by nanoindentation to determine the effect of the cooling rate on the nanohardness of each phase.
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