Pearlite spheroidization and his relationship with tensile strength in hypereutectoid steels.

With the aim of improving the mechanical properties in pearlitic steels and studying the effect of chromium and molybdenum, the relationship between the tensile strength and microhardness with the pearlite interlamellar spacing in spheroidization process of hypereutectoid steels was studied in this work. Through microstructural characterization, standard mechanical tests and the study of fracture surfaces, it was found that the increase in the cooling rate reduces the pearlite interlamellar spacing, therefore, increases the ultimate tensile strength and the ductility in the steels. Based on the results obtained, correlations were obtained to predict the ultimate tensile strength as a function of microhardness and interlaminar spacing of the pearlite.