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Ihom, A.P. heat treatment parameters control and their effect on quality, in house seminar presented at National Metallurgical Development Centre, Jos, 2002, 1-20.

has been cited by the following article:

Article

The Effect of Holding Time on the Hardness of Case Hardened Mild Steel

1Department of Mechanical Engineering, University of Uyo, PMB 1017 Uyo, Akwaibom State-Nigeria


Materials Science and Metallurgy Engineering. 2014, Vol. 2 No. 3, 31-34
DOI: 10.12691/msme-2-3-1
Copyright © 2014 Science and Education Publishing

Cite this paper:
Ihom P. Aondona, Aniekan Offiong. The Effect of Holding Time on the Hardness of Case Hardened Mild Steel. Materials Science and Metallurgy Engineering. 2014; 2(3):31-34. doi: 10.12691/msme-2-3-1.

Correspondence to: Ihom  P. Aondona, Department of Mechanical Engineering, University of Uyo, PMB 1017 Uyo, Akwaibom State-Nigeria. Email: draondonaphilip@gmail.com

Abstract

The study “the effect of holding time on the hardness of mild steel case hardened with carburizing material energized by cow-bone” has been x-rayed. The mild steel specimens used for the study were carburized in the furnace at 900C at various holding times of 2 hrs, 4 hrs, 6 hrs, and 8 hrs, using 65% charcoal / 35% cow-bone as carburizing material. Hardness values were obtained using Vickers Micro-hardness Tester Machine, from the hardness values, hardness profiles were plotted. The result of the study clearly showed that the hardness of the carburized steel increased with increase in holding time. The hardness profile results were higher for higher holding time (surface hardness: 830 Hv for 2 hrs, 850 Hv for 4 hrs, 900 Hv for 6 hrs and 1000 Hv for 8 hrs) and also the plot of the profile for 8 hrs holding time was higher than that of 6 hrs, and that of 6 hrs was higher than that of 4 hrs, and in that order. This clearly showed that holding time has effect on the hardness of case hardened steel.

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