EFFECTS OF INOCULATION ON VARYING WALL THICKNESSES IN GRAY CAST IRON RECYCLING

Cast irons are important engineering materials, which possess a wide range of attractive properties. Their properties are significantly dependent on the microstructure of the cast irons. A way of controlling the microstructure of cast iron is through the control of cooling rates during solidificatio...

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Bibliographic Details
Published in:Acta Technica Corvininesis 2018-01, Vol.11 (1), p.41-45
Main Authors: Seidu, Saliu Ojo, Talabi, Henry Kayode, Akande, A S
Format: Article
Language:English
Subjects:
Cast iron
Casting
Castings
Composition effects
Cooling
Cooling rate
Failure analysis
Flakes
Graphite
Gray iron
Inoculation
Microstructure
Solidification
Wall thickness
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Summary:Cast irons are important engineering materials, which possess a wide range of attractive properties. Their properties are significantly dependent on the microstructure of the cast irons. A way of controlling the microstructure of cast iron is through the control of cooling rates during solidification. To control the cooling rate, inoculants are necessary mostly in the thin castings. This project presents the study of the effect of inoculants of fixed composition in the wall thickness ranges from 3.5-12.5mm of grey cast iron. The chemical compositions of both the inoculated and un-inoculated were determined. The eutectic cells, the graphite flakes in the microstructure and hardness of the varying wall thicknesses were also evaluated. From the results there were significant effects of inoculants on the section thickness unlike the un-inoculated sample. The eutectic cells were more in the 3.5, 4.5 and 5.0 mm thicknesses while the other thicknesses showed the reduction in the eutectic cells. There is evenly distribution of graphite flakes in the 11.5 and 12.5 mm thicknesses of type A, 7.0 and 8.0 mm sections contain graphite flakes of type B while 3.5 and 4.5 mm sections contain no graphite flakes due to rapid cooling of the samples.
ISSN:2067-3809