Effect of Bitumen on the Mechanical Properties of Medium Carbon Steel

Abdulmumin Akoredeley Alabi, Peter Bitrus Madakson, Danjuma Saleh Yawas, Terver Ause

Department of Mechanical Engineering, Faculty of Engineering, Ahmadu Bello University, Zaria, Nigeria.
Department of Metallurgical and Material Engineering, Faculty of Engineering, Ahmadu Bello University, Zaria, Nigeria.

DOI: 10.4236/jmmce.2013.14023                

Abstract

The effect of austempering of 0.45% carbon steel in hot bitumen on the hardness, impact strength, tensile properties and microstructure were investigated. The hardness values, impact strengths and tensile strengths of the austempered samples increased almost linearly from the austempering time of 1 hour to 3 hours after which they all dropped. At the austempering time of 3 hours the maximum values of hardness, impact strength and tensile strength of 496.2HV, 149J and 706.2 N/mm2respectively were attained. These values are 24.5%, 4.9% and 25.8% higher than the hardness values, impact strength and tensile strength respectively of the as-received steel. The high impact strength and tensile strength recorded despite the high hardness value was probably due to the formation of bainite structure and the diffusion of carbon from the bitumen into the steel samples.

Keywords

Bitumen; Austempering; Mechanical Properties; Tensile Strength; Impact Strength

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	T. V. Rajan, C. P. Sharma and A. Sharma, “Heat Treatment Principle and Techniques,” Prentice-Hall, New Delhi, 1988, pp. 1-11.
[2]	M. A. Olutoye, “Improvement of Nigeria Crude Residue,” Leonardo Journal of Science, No. 7, 2005, pp. 33-42.
[3]	Ips-M-Tp-295 Standard, “Material and Equipment Standard for Bitumen Primer (Cold Applied) for Use with Hot Applied Bitumen Enamel,” Iranian Ministry of Petroleum, July 1994. http://igs.nigc.ir/STANDS/IPS/M-TP-285.PDF
[4]	C. E. Bates and G. E. Totten, “Quench Severity Effects on the As-Quenched Hardness of Selected Alloy Steels,” Heat Treatment of Metals, Vol. 2, 1992, pp. 45-48.
[5]	M. S. Htun, S. T. Kyaw and K. T. Lwin, “Effect of Heat Treatment on Microstructures and Mechanical Properties of Spring Steel,” Journal of Metals, Materials and Minerals, Vol. 18, No. 2, 2008, pp. 191-197.
[6]	M. B. Ndaliman, “An Assessment of Mechanical Proper- ties of Medium Carbon Steel under Different Quenching Medium,” AU Journal of Technology, Vol. 10, No. 2, 2006, pp. 100-104. http://www.journal.au.edu/au_techno/2006/oct06/journalTechV10N2_aticle06.pdf
[7]	S. B. Hassan, J. B. Agboola, V. S. Aigbodion and E. J. Williams, “Hardening Characteristics of Plain Carbon Steel and Ductile Cast Iron Nsing Neem Oil as Quenchant,” Journal of Minerals and Eaterials Characterization and Engineering, Vol. 10, No. 2, 2011, pp. 161-172.
[8]	B. O. Adewuyi and A. A. Afonja, “Austempered Ductile Iron a Viable Alternative to Steel,” Nigerian Journal of Engineering and Management, Vol. 1, No. 1, 2000, pp. 6-13.
[9]	A. H. Raymand, “Engineering Metallurgy,” 6th Edition, Part II, Edward Arnold, London, 1993.
[10]	R. Kazerooni, N. Nazarboland and R. Elliott, “Use of Austempering Temperature in Control of Austempering of Mn-Mo-Cu Alloyed Ductile Iron,” Material Science and Technology, Vol. 13, No. 12, 1997, pp. 1007-1015. doi:10.1179/026708397790301990
[11]	M. H. A. Kempster, “Material for Metallurgists,” ELBS, Hodder and Stoughton, 1984, pp. 16-24.
[12]	A. A. Alabi, A. I. Obi, D. S. Yawas, I. A. Samotu and S. I. M. Stephen, “Effect of Water Temperature on the Mechanical Properties of Water-Quenched Medium Carbon Steel,” Journal for Energy Technologies and Policy, Vol. 2, No. 4, 2012, pp. 40-45.
[13]	T. D. Eastop and A. McConkey, “Applied Thermodynamics for Engineering Technologies,” Longman Group, UK Ltd., 1993.
[14]	K. E. Thelning, “Steel and Its Treatment,” Butterworths, London, 1984.
[15]	T. Ause, “Evaluation of Hot Bitumen Bath as a Quenching Medium for Austempering of Steels and Ductile Cast Iron,” Ph.D. Thesis, Ahmadu Bello University, Zaria, 2007.
[16]	A. A. Alabi, “Improving the Mechanical Properties of Bicycle Axle Using Bitumen Treatment,” M.Sc. Thesis, Ahmadu Bello University, Zaria, 2009.