Prediction of Hypoeutectic Gray Iron Microstructure during Solidification and Solid Transformation Using Simple Fourier Model

Abstract:

Phases’ evolution during the solidification of a hypoeutectic 3.92% C-equivalence cast iron was modelled by considering the cooling history of the alloy from the melt, thus including both solidification and solid state transformations. Simple Fourier model was used to combine macroscopic heat flow and microscopic kinetics for phase evolution. Different cooling rates were obtained by casting cylinders and stepped plates. Measured number of primary austenitic nuclei, eutectic cells and volume fraction of phases during solidification (graphite, a-ferrite, pearlite and cementite), are correlated with the cooling rate. Growth rate constants for primary austenite, are found to be  = 8.7E-7, and n = 2.3. Growth rate constants for primary graphite (types A, B, and C), are found to be  =5.7E-7, and n = 2. The model matches with the experimental work where the error percent of modelling volume fractions of pearlite, graphite, ferrite and cementite ranges between 0.2 and 1.5%.

• Periodical: Key Engineering Materials (Volume 457)
• Pages: 293-298
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.457.293
• Online since: December 2010
• Authors: Mohamed A. Taha, Nahed A. El Mahallawy, Ahmed M. El-Sabbagh, Talat El-Benawy, Hasan F. Hadla
• Keywords: Heat Flow, Hypoeutectic Cast Iron, Kinetic, Phase Transformation, Solid State Transformation, Solidification

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