Tecnologia em Metalurgia, Materiais e Mineração
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original – Special issue Tribute to Dr. Wilson Luiz Guesser

Secondary graphitization kinetics in a gray cast iron

Paulo Henrique Ogata, Wilson Luiz Guesser, Hélio Goldenstein

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This work aims to study the solid state graphite precipitation on a grey cast iron during isothermal martensite tempering treatments at high temperatures, a phenomenon known as “secondary graphitization”. Samples austenitized at 900 °C and quenched with He, were heated up to 650 °C and maintained at this temperature on a quenching dilatometer. Reactions during heating and during isothermal maintenance were detected through volumetric changes. Kinetics results were interpreted using Burke and Swindells equations.


Secondary graphitization; Tempering of the martensite; Kinetics of graphite formation and grey cast iron.


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