Abstract
This paper presents the results obtained and the deductions made from a series of microstructural studies and strength tests involving austempered chilled ductile iron which was sand cast using a variety of end chills (metallic, non-metallic, water-cooled and sub-zero, respectively). The effect of cooling rate on the dendrite arm spacing, eutectic cell count and the ultimate tensile strength were evaluated. It was found that the ultimate tensile strength is highly dependent on the rate of chilling which determines the dendrite arm spacing and the eutectic cell count of the material. Attempts were also made in this paper to explain these effects and to correlate the UTS with DAS and ECC. Moreover, it was found that UTS decreases as DAS increases and UTS increases as ECC increases.
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