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

1 Vatavuk J, Sinatora A, Goldenstein H, Albertin E, Fuoco R. Efeito da morfologia e do número de partículas de grafita na fratura de ferros fundidos com matriz ferrítica. Metalurgia ABM. 1990;46(386):66-70.

2 Mageza K, Caneia F, Mavhungua S, Banganayia C. Process Improvements of Ferritic Ductile Irons to achieve higher impact properties at subzero temperatures. In: Proceedings of the 2nd Carl Loper Cast Iron Symposium, Latest Advances and Applications of Cast Iron; 2019; Bilbao, Spain. Spain: Azterlan Metallurgy Research Centre; 2019.

3 Klein AN, Binder C, Hammes G, de Mello JDB, Ristow W Jr, Binder R. Self lubricating sintered steels with high mechanical resistance obtained via in situ formation of solid lubricant particles during sintering. In: Proceedings of Euro PM2009 Congress Proceedings; 2009; Copenhagen, Denmark. Chantilly: European Powder Metallurgy Association; 2009. p. 191-196. (vol. 1).

4 Hatakeyama T, Sawada K, Sekido K, Hara T, Kimura K. Graphitization behaviors of creep-ruptured 0.3% carbon steel at 673 to 773 K. ISIJ International. 2021;61(3):993-1001.

5 Iwamoto T, Hoshino T, Matsuzaki A, Amano K. Effects of boron and nitrogen on graphitization and hardenability in 0.53% c steels. ISIJ International. 2002;42(Suppl.):S77-S81.

6 Okamoto A. Graphite formation in high-purity cold-rolled carbon steels. Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science. 1989;20:1989.

7 Rounaghi SA, Shayesteh PE, Kiani-Rashid AR. Microstructural study in graphitized hypereutectoid cast and commercial steels. Materials Science and Technology. 2011;27(3):631-636.

8 Pimentel ASO, Guesser WL, Goldenstein H. Formação de grafita secundária em ferro fundido cinzento. In: Proceedings of the 68th ABM International Anual Congress; 2013; São Paulo. São Paulo: ABM; 2013. p. 958-969.

9 Pimentel ASO. Grafitização secundária em ferro fundido cinzento [dissertação]. Joinville: Universidade do Estado de Santa Catarina; 2011.

10 Askeland DR, Farinez F. Factors affecting the formation of secondary graphite in quenched and tempered ductile iron. AFS Transactions. 1979;87:99-106.

11 Caballero F. Dilatometric study of reaustenitisation of high silicon bainitic steels: decomposition of retained austenite. Materials. 2005;46(3):581-586.

12 Nishikawa AS, Miyamoto G, Furuhara T, Tschiptschin AP, Goldenstein H. Phase transformation mechanisms during Quenching and Partitioning of a ductile cast iron. Acta Materialia. 2019;179:1-16.

13 Bhadeshia H, Honeycombe R. Steels: microstructure and properties. 3rd ed. Amsterdam: Butterworth-Heinemann; 2006. 360 p.

14 Marra KM, Santos AA. Método de determinação da cinética de transformação de fases a partir de curvas dilatométricas. In: Anais do Congresso da ABM; 2006; Rio de Janeiro. São Paulo: ABM; 2006.

15 Burke J, Swindells N. The nucleation and growth of graphite during malleabilizing: recent research on cast iron. London: Gordon and Breach Science Publishers; 1968. p. 449-474.

16 Rios PR, Padilha AF. Transformações de fase. São Paulo: Artliber; 2007. 215 p.


Submetido em:
17/09/2021

Aceito em:
03/02/2022

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