Proceso de recristalización durante el recocido de un acero 0,04%c calmado al aluminio

The recrystallization process of a commercial 0.04%C Al-killed steel, cold rolled up to 80% subjected to a annealing heat treatment at variable heating rates was evaluated in the present study. For this purpose, samples were isothermally annealed at various heating rates (12oC/h, 20oC/h, 40oC/h and 650oC/min) and then soaked at 700oC for 15 hours. The microstructural evolution of the samples followed by optical microscopy, scanning and transmission electron microscopy, showed that the recrystallization process took place between 600 and 650oC for the samples heated at low rates (12oC/h, 20oC/h and 40oC/h), and the grain structure developed was the so called “ pancake” type. The grain size for these samples showed an insignificant growth during the holding stage at 700oC. On the other hand, with the samples heated at 650oC/min, the recrystallizaction occurred on reaching 700oC, the grain structure was more equiaxial and the grain size changed appreciably during the holding stage. The spheroidization process of cementite occurred in significant amounts during the holding stage at 700oC. The precipitation and coarsening of AlN particles were also evaluated during the holding stage at 700oC.

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