Tecnologia em Metalurgia, Materiais e Mineração
https://tecnologiammm.com.br/article/doi/10.4322/2176-1523.20222643
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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Abstract

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.

Keywords

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

Referências

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Submetido em:
17/09/2021

Aceito em:
03/02/2022

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