Fabrication of End Quenched Machine: Hardenability Evaluation

A. A. Yekinni, J. O. Agunsoye, S. A. Bello, I. O. Awe, S. I. Talabi

Department of Mechanical Engineering, Lagos State Polytechnic, Lagos, Nigeria.
Department of Metallurgical and Materials Engineering, University of Ilorin, Ilorin, Nigeria.
Department of Metallurgical and Materials Engineering, University of Lagos, Lagos, Nigeria.
Department of Metallurgical Engineering, Yaba College of Technology, Lagos, Nigeria.

DOI: 10.4236/jmmce.2014.22014                

Abstract

The Jominy end quench machine was designed, manufactured and tested. The manganese steel was developed. The as-cast manganese steels were quenched in water at different austenising temperatures and hardenability test was carried out on the samples cut at different distances from the quenched surface with the use of the manufactured Jominy end quench machine. The optical microscope was used to investigate the microstructure of the cut samples. Results revealed that the Jominy end quench machine worked effectively with short cycle time and improved water management system. The extremely rapid cooling prevents the decomposition of the chromium carbides. However, the hardness values of the samples decreased with increase in the distance from the quenched surface and the size of the chromium carbides increased with austentic temperatures which is responsible for reduction in the hardness values of the quenched samples at higher austentinic temperature. The manufactured Jominy end quench machine has advantages of improved water management system and short processing time over the existing ones.

Keywords

Hardenability; Jominy Specimen; Martensitic; Mass Effect; Microstructure

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Prabhudav, K.A. (1988) Handbook of Heat Treatment of Steels. Tata McGraw-Hill Publishing Company Limited, New Delhi.
[2]	Marrow, J. (2001) Understanding the Jominy End Quench Test. Manchester Materials Science Centre UMIST, Manchester.
[3]	Kadpal, B.C., et al. (2001) A Review of Jominy Test and Determination of Effect of Alloying Elements on Hardenability of Steel Using Jominy End Quench Test. International Journal of Advances in Engineering and Technology, 1, 65-71.
[4]	Pietrzyk, M. and Kuziak, R. (2011) Computer Aided Interpretation of Results of the Jominy Test. Archives of Civil and Mechanical Engineering, 11, 707. http://dx.doi.org/10.1016/S1644-9665(12)60111-3
[5]	Kutz, M. (2002) Handbook of Materials Selection. John Wilson & Sons Inc., New York. http://dx.doi.org/10.1002/9780470172551
[6]	Orivjir, J.A. (2012) Design and Manufacturing Plan of a Jominy Testing Device. Bachelor’s Thesis, HAMK University of Applied Science, Mechanical Engineering and Production Technology, Riihimaki.
[7]	Bain, E.C. and Paxton, H.W. (1966) Alloying Elements in Steel. American Society for Metals, Cleveland.
[8]	Papworth, A. and Williams, D.B. (2000) Segregation to Prior Austenitic Grain Boundaries in Low Alloy Steels. Scripta Materialia, 42, 1107-1112. http://dx.doi.org/10.1016/S1359-6462(00)00335-3
[9]	Research Institute of Industrial Science and Technology (RIST) (1988) Model for Controlling and Predicting the Quality in C-Mn Steels. Technical Report.