Abstract
High-silicon spheroidal graphite (SG) irons present higher changes of density during the solidification process when compared to normal SG irons. This special behavior is particularly significant in the last stages of solidification, where the graphite expansion may become insufficient to compensate the contraction of the austenite and the risk of microporosity formation increases. The goal of this laboratory research was to establish correlations between the different levels of nodule count obtained using five commercial inoculants, the cooling rate at the end of solidification, and the shrinkage porosity propensity. The analysis was conducted on thermal analysis cups that were sectioned and evaluated for microstructure by optical metallography and by 2D analysis with the Image J software to quantify the size of the microporosity region. It was found that a higher nodule count, associated with higher cooling rate at the end of solidification, generates lower porosity. SEM analysis was conducted to study the nature of nuclei. Complex (MgSiAl)N nitrides were found as the main nucleation sites for graphite.
Highlights
Imme understanding porosity formation and the development of subsequent processes that can after pouring, the liquid iron cools, liquid shrinkage occurs as the density of the lead to its elimination in casting is a promising quality improvement route, but increases, and its specific volume decreases
A 0.2 mass% of commercial inoculant was deposited on the bottom of the thermal analysis (TA) cups before filling
Si spheroidal graphite iron was evaluated on thermal mal analysis parameters of 4.08%
Summary
Publisher’s Note: MDPI stays neutral claimswith in published maps and instituregard to jurisdictional claims in maps and institutional affiltional published affiliations. AZTERLAN, Basque Research and Technology Alliance (BRTA), 48200 Durango, Spain; Abstract: High-silicon spheroidal graphite (SG)
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