Abstract
The goal of this paper is to determine the austenite-to-pearlite isothermal decomposition mechanisms in a 0.44C-0.73 Mn steel. More precisely, the role of austenitizing temperature (T γ ), and hence the austenitic grain size (AGS), in the kinetics of pearlite formation has been studied. Results allow us to conclude that the average size of pearlitic colonies is increased as the AGS is increased. On the other hand, it appears that the interlamellar spacing of the pearlite does not depend on the T γ but is controlled by the isothermal decomposition temperature of austenite (T). Finally, it was found that formation of pearlite is triggered for small AGS values and isothermal decomposition temperature regimes where the predominant controlling mechanism is due to carbon volume diffusion.
Highlights
The goal of this paper is to determine the austenite-to-pearlite isothermal decomposition mechanisms in a 0.44C-0.73 Mn steel
Results allow us to conclude that the average size of pearlitic colonies is increased as the austenitic grain size (AGS) is increased
It appears that the interlamellar spacing of the pearlite does not depend on the Tg but is controlled by the isothermal decomposition temperature of austenite (T)
Summary
La perlita es una estructura laminar de ferrita (a) y cementita (q) que se forma a temperaturas iguales o inferiores a la temperatura del eutectoide de un acero. Profundizar en el conocimiento de los mecanismos de descomposición de la austenita en perlita resulta primordial a la hora de controlar parámetros microestructurales como el espaciado interlaminar perlítico y el tamaño de colonia perlítica, que tienen una influencia directa en las propiedades mecánicas finales de los aceros perlíticos. En este estudio se intenta dilucidar el papel que tiene la temperatura de austenización (Tg), y por tanto, el tamaño de grano austenítico de partida (TGA), en la cinética de formación de la perlita en un acero 0,44C - 0,73 Mn. Por último, es también un objetivo de este trabajo el clarificar la existencia o no de dos mecanismos de crecimiento de perlita en el acero de estudio. Para ello se realizarán medidas directas con ayuda del análisis composicional por rayos X en un microscopio electrónico de transmisión sobre la intercara de transformación austenita-perlita, y medidas indirectas por medio de técnicas metalográficas cuantitativas para evaluar la velocidad de formación de perlita durante un tratamiento isotérmico determinado
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