Browsing by Author "Godoy, L. A."

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    Analysis of ductile cast iron solidification: numerical simulation and experimental validation
    (TAYLOR & FRANCIS LTD, 2009) Dardati, P. M.; Celentano, D. J.; Godoy, L. A.; Chiarella, A. A.; Schulz, B. J.
    This paper presents an experimental and numerical study of the solidification process of ductile cast iron under slightly hypereutectic conditions. The material thermo-microstructural behaviour is measured in tests performed using standardized cups. Cooling curves at the centre of the cup were recorded, and metallographic studies were carried out to investigate the number and size of graphite nodules at the end of the process. Different models were tested: a model based on a uninodular theory and two models which represent the multi-nodular theory. The cooling curves predicted by these models are in good agreement with the experimental measurements. Some scatter is found, however, in the numerical-experimental comparison for the graphite nodule density at different points of the sample.
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    Computational simulation of microstructure evolution during solidification of ductile cast iron
    (TAYLOR & FRANCIS LTD, 2008) Celentano, D. J.; Dardati, P. M.; Godoy, L. A.; Boeri, R. E.
    This paper presents a thermomicrostructural model for the simulation of the solidification process of an eutectic ductile cast iron. The thermal balance is written at a macroscopic level and takes into account both the structural component being cast and its mould. Models of nucleation and growth represent the evolution of the microstructure, and the microsegregation of silicon is also considered. The resulting formulation is solved using a finite element discretisation of the macrodomain, in which the evolution of the microstructure is taken into account at the Gauss integration points. The numerical results are presented in terms of cooling curves and are compared with available experimental values. Furthermore, the sensitivity of the response with respect to changes in the cooling rate and nucleation parameters are investigated. The agreement between experimental and computational values is acceptable in both quantitative and qualitative aspects. Ways to improve the computational model are suggested.
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    Thermal expansion of a Spheroidal Graphite Iron: A micromechanical approach
    (2018) Rodriguez, F. J.; Boccardo, A. D.; Dardati, P. M.; Celentano, Diego J.; Godoy, L. A.