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Thehypereutectic region of grey cast iron has received very little attentionespecially for designing cast products by researchers. Due to its high carbonequivalence, hypereutectic grey iron poses some challenges especially itstendency for grey to white transition (GWT) at this level of carbon content.However, hypereutectic grey iron possesses inherent properties that could beeasily utilized for improved performance in automobile engines and brake padsystem. Significantly, they could be modified for superior hardness, strengthand toughness. This study presents the effect of microalloying on themechanical behaviour of hypereutectic grey cast iron with carbon equivalenceabove 4.5. The first part of this work presented in this paper considers theaddition of Cu-Ni and Cu-Ni-Mn to series of as-cast hypereutectic grey castiron and their hardness and tensile strength were studied and compared. A totalof 33 cast samples were obtained with the control sample. The examination ofthe micrographs revealed that graphite eutectics cells of Type A and A + D wereobtained in the resulting microstructure. Results analyses showed that theferrite forming tendency of silicon was suppressed due to the high carboncontent of the as-cast hypereutectic grey iron coupled with the absence ofinoculation which plays a great role in the graphite flake type, network, sizeand distribution. Cu-Ni microalloying was also confirmed to promote hardnesswith the hardening effect limit of nickel observed at 1.3% composition. ForCu-Mi-Mn addition, excess and free sulphur in the hyper- eutectic grey ironresults in reverse effect of manganese on strength, hardness, reduced graphiteflake size and shape.

Effect of Cu-Ni and Cu-Ni-Mn on the Microstructural and Mechanical Behaviour of As-Cast Non-Inoculated Hypereutectic Grey Iron