Abstract
In the present paper, past research work with new and/or improved processes for willing graphitisation in steels is reviewed. Experiments were carried out to study the carbide dissociation in two different hypereutectoid steels (cast and commercial steels) during graphitisation process by annealing primary martensitic structures at 670°C. Graphite phase evolution during graphitisation treatment was investigated by light optical and scanning electron microscopy and energy dispersive X-ray analyses. It has been reported with promising results that a uniform distribution of alloying elements is found around the graphite particles, which resulted in cast steel. Furthermore, graphite particles in the cast steel were observed to be larger and more spherical than that in commercial steel, which seems to be due to lower Mn/S ratio in cast steel composition.
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