Abstract
Current study evaluated the machinability characteristics of parts, microstructure and mechanical properties when three different inoculants (IM-22 with FeSi-Ba/Zr; G-20 and FeSi-Ba; IMSR 75 with FeSi-Sr) were added in experiments carried out in a foundry. The research methodology was mailly based on the analysis of the machinability by the milling process of the specimens in gray cast iron GG-25, name according to DIN EN 1561.Evaluation of results is based on a thorough analysis of tool wear, surface finish, microstructural analysis, chemical composition and mechanical properties of the material. Results showed that among the studied inoculants strontium sulfide (SrS) was thermodynamically more stable than the others, because it leds towards a more negative free energy change of Gibbs and therefore more favorable to the formation of nuclei having greater critical radius (r c ), solidification with heterogeneous nucleation. Its inoculant was also more efficient in forming a more favorable microstructure, greater amounts of eutectic cells and, longer life of the insert when machined.
Highlights
Efeitos de diferentes inoculantes nas características microestruturais de ferro fundido cinzento gg-25, dureza e vida útil de ferramenta
It should be emphasize that silicon is present in greater amounts in the inoculant IMSR75, which contains strontium
The cast iron inoculated with IM-22 showed a small of percentage super-cooling graphite
Summary
Efeitos de diferentes inoculantes nas características microestruturais de ferro fundido cinzento gg-25, dureza e vida útil de ferramenta. Por meio de experimentos realizados em uma fundição, a atuação na adição de três inoculantes diferentes (IM-22 com FeSi-Ba/Zr, G-20 e FeSi-Ba, e IMSR 75 com FeSi-Sr), para observar características de usinabilidade de peças, microestrutura e propriedades mecânicas. 355-360, Oct.-Dec., 2015 eutectic cells to avoid, graphite of super-cooling and carbide graphite in the metal matrix, and prevents solidification by metastable eutectic system to obtain the graphite A type. It is a viable approach to improve the machinability of the material (COLLINI et al, 2008)
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