Annealing Heat Treatment Effects on Steel Welds

A.V. Adedayo, S.A. Ibitoye, O.A. Oyetoyan

Department of Metallurgical Engineering, Kwara State Polytechnic, Ilorin, Nigeria.
Department of Metallurgical Engineering, Nigerian Naval Engineering School, Sapele, Nigeria.
Materials Science and Engineering Department, Obafemi Awolowo University, Ile-Ife, Nigeria.

DOI: 10.4236/jmmce.2010.96039                

Abstract

This paper reports investigations made on the annealing heat treatment effects on steel welds. The properties of the weld investigated were hardness value and toughness. Micro examination of the samples was also done with optical microscopy. Four (4) different grades of steel rods (10mm) in diameter were obtained. The range of the carbon contents of the steel rods was from 0.16 wt pct C to 0.33 wt pct C. From each grade of the steel materials, grooved specimen of about 150mm were prepared. The groves were then filled to create welds using arc welding. The resulting welds were then subjected to annealing heat treatment. The hardness values and toughness of the welds were determined. The microstructural analyses of the welds were carried out as well. The results show that hardness and toughness were dependent on the carbon content. There was also significant microstructural modification due to heat treatment.

Keywords

Welding, Annealing, Heat treatment, Hardness, Toughness, Microstructure

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	International Institute of Welding 1988 Guidelines for the classification of ferrite steel weld metal microstructure constituents using the light microscopy, International Institute of Welding, IIW DOC. IX-1533-88.
[2]	da Trindade Filho V.B., A.S. Guimaraes, J. da C. Payao Filho, R.P. da R. Paranhos 2004 Normalizing heat treatment effects on low alloy steel weld metals. Journal of Brazilian Society of Mechanical Sciences and Engineering, Vol. 26., No. 1
[3]	Grong, O. 1992 Microstructure and properties of steel weld metals in : D.L. Olson and T.H. North (eds. ) Ferrous Alloys Weldments Transaction Technical Publications. Pp 21-46.
[4]	Evans, G.M. 1991 The effects of Nickel on microstructure and properties of C-Mn all-weld metal deposits. Welding Research Abroad, 37, Vol. 41
[5]	Rajan, T.V.; Sharma C.P.; Sharma A. 1988 Heat treatment principles and techniques; prentice-Hall of India, Private Ltd. New Delhi, pp289.
[6]	Rajput, R.K. 2006 Engineering materials and metallurgy, 1st ed. S. Chand & Co. New Delhi. pp. 66
[7]	Higgins, R.A. 1998 Properties of engineering materials, 2nd ed., Viva books, Private Ltd, New Delhi.
[8]	Brophy, J.H., Rose, R.M.; Wulff J., 1964 The structure and properties of materials, thermodynamics, vol.2, John Wiley and Sons, Brisbane, pp 113-114, 188-189