The suitability of seashell, animal bone and sodium carbonate as energizers in case carburization of mild steel. | [Journal of Basic and Applied Sciences • 2013]

Author(s):

1. O. S. Fatoba: Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria, South Africa; Department of Metallurgical and Materials Engineering, University of Lagos, Akoka, Yaba, Lagos, Nigeria

2. M. A. Bodude: Department of Metallurgical and Materials Engineering, University of Lagos, Akoka, Yaba, Lagos, Nigeria

3. O. L. Akanji: Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria, South Africa

4. I. O. Adamson: Department of Metallurgical and Materials Engineering, University of Lagos, Akoka, Yaba, Lagos, Nigeria

5. S. C. Agwuncha: Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria, South Africa

Abstract:

This work examines the suitability of using seashell (Oyster shell), animal bone and Na2CO3 materials as energizers for case hardening of mild steel. A carburizer consisting of charcoal was used for research with sea shell, animal bone and Na2CO3 as energizers. Samples were carburized in fabricated rectangular stainless steel boxes using different percentages of energizers (10, 20, 30, 40, and 50%) respectively. The samples were covered completely in each of the boxes with the mixture of carburizer and energizer placed in the chamber of the furnace. The process was carried out at carburizing temperature of 950° C, soaked for 4, 6, and 8hours and quenched in oil. Twenty samples were further tempered at 200° C for 1hour to relieve the stress built up during quenching. Hardness test, chemical analysis and impact test were carried out on the samples. The hardness values of the carburized mild steel were measured with a micro hardness tester. The results of the study showed that hardness values of the untempered mild steel samples were slightly improved than the tempered samples at carburizing temperature of 950°C and carburizing time of 4, 6 and 8hours. The Impact results revealed that samples carburized at 950°C in seashell energizer for 8hours have the highest impact values of 184 Joules for the tempered samples which are higher than the untempered samples due to increase in toughness resulting from tempering. The results also showed that seashell and animal bones are potential energizers in case carburization of mild steel.

Page(s): 578-586

DOI: DOI not available

Published: Journal: Journal of Basic and Applied Sciences, Volume: 9, Issue: 0, Year: 2013

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