|About this Abstract
||MS&T21: Materials Science & Technology
||Nucleation of Solid-State Phase Transformations
||Effect of Cooling Rate and Austenitic Grain Size on the Austenite Decomposition Kinetics in a Low- carbon Steel
||Carlos Alberto Barajas-Miguel, Octavio Vázquez-Gómez, Antonio Oliver-Reynoso, Edgar López-Martínez, Héctor Javier Vergara-Hernández
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The influence of cooling rate and austenitic grain size on the austenite decomposition kinetics in a low-carbon steel under cooling conditions were analyzed. Austenite decomposition occurred in two stages: 1) formation of ferrite from austenite and 2) formation of pearlite from residual austenite and ferrite. Non-isothermal analysis was performed to determine the critical decomposition temperatures, as well as, the activation energies employing Kissinger method. Finally the continuous cooling transformation diagrams were constructed in a range of 1 to 25 ºC min-1. The austenite grain size was estimated using a semi-empiric equation, while the decomposition and austenite kinetics were described in terms of the undercooling and the JMA model. It was observed that the undercooling influenced the austenite decomposition behavior, while the undercooling was affected by the austenite grain size and the cooling rate.