This work examines the effect of process variables on the mechanical property of carburized AISI\n1018 steel quenched in water and oil for improved performance. A carburizer consisting of charcoal\nwas used for research with sea shell as energizer. Samples were carburized using weight percent\nof seashell (10, 20, 30 and 40%) with particle sizes of 212 �µm, 425 �µm and 600 �µm respectively.\nThe process was carried out at carburizing temperature of 950�°C, soaked for 4, 6, and 8 hours and\nquenched in oil and water. The samples were further tempered at 200�°C for 1hour to relieve the\nstress built up during quenching. Hardness test was carried on the steel samples. The results of the\nstudy showed that hardness values of the carburized and tempered steel increased with influence of soaking time, volume fraction and particle sizes of energizer. The optimal carburizing effect was\nachieved at 90% charcoal and 10% seashell (energizer) of 212 �µm particle size at 8 hrs soaking\ntime when quenched in water.
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