Abstract
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.
Highlights
One reason for the wide use of iron castings is the high ratio of performance to cost that they offer
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
Summary
One reason for the wide use of iron castings is the high ratio of performance to cost that they offer This high value results from many factors, one of which is the control of microstructure and properties that can be achieved in the as-cast condition [8]. This enabled a high percentage of ferritic and pearlitic iron castings to be produced without the extra cost of heat treatment [9] [10]. The study seeks to find out the influence of Cu-Ni and Cu-Ni-Mn on the hardness and tensile properties of a developed hypereutectic GCI (chemical equivalence = 4.5 - 5.2 wt%) composition for improved performance in mechanical properties and compare with typical grey iron and slightly inoculated hypereutectic grey iron in relevant studies
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