Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30075
The Effect of Laser Surface Melting on the Microstructure and Mechanical Properties of Low Carbon Steel

Authors: Suleiman M. Elhamali, K. M. Etmimi, A. Usha

Abstract:

The paper presents the results of microhardness and microstructure of low carbon steel surface melted using carbon dioxide laser with a wavelength of 10.6μm and a maximum output power of 2000W. The processing parameters such as the laser power, and the scanning rate were investigated in this study. After surface melting two distinct regions formed corresponding to the melted zone MZ, and the heat affected zone HAZ. The laser melted region displayed a cellular fine structures while the HAZ displayed martensite or bainite structure. At different processing parameters, the original microstructure of this steel (Ferrite+Pearlite) has been transformed to new phases of martensitic and bainitic structures. The fine structure and the high microhardness are evidence of the high cooling rates which follow the laser melting. The melting pool and the transformed microstructure in the laser surface melted region of carbon steel showed clear dependence on laser power and scanning rate.

Keywords: Carbon steel, laser surface melting, microstructure, microhardness.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1071660

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 2164

References:


[1] M. S. Fernando de Lima, F.A. Golia, R. Riva, A. Mariado, E. Santo, Laser surface re-melting and hardening of an automotive shaft using high power laser, Mat. Res., 10 (9 (2007).
[2] A.S.C.M. Olivera, R.S.C. Paredes, F.P. Weber, R. Vilar, Microstructure changes due to laser surface melting of AISI304 stainless steel, Mat. Res. 4 (2) (2001).
[3] E. Kennedy, G. Byrne, D.N. Lulias, A review of the use of high power diode laser in surface hardening, J. of Materials. Processing Technology, 155-156(2004) 1855- 1860.
[4] M. Kulka, A. Pertek, Microstructure and properties of borided 41Cr4 steel after laser surface modification by re-melting, Applied Surface Science, 214 (2003) 278-288.
[5] P.P. Psyllaki, A. Grniari, D.J. Pantlis, parametric study on laser nitriding of 1.5919 steel, J. of materials processing technology, 195 (2008) 299- 304.
[6] J. H. Abbaud, K.Y. Benyyounis, A.G. Olabi, M.S.J. Hashmi, Laser surface treatment of iron based substrates for automotive applications, J. of Materials Processing Technology, 182 (1-3) (2007).
[7] S.H. Aldajah, O.O. Ajayi, G.R. Fenske, Z.Xu, Effect of laser surface modifications on tribological performance of 1080 carbon steel, J. of Tribology, 127 (3) (2005) 596 -604.
[8] M.H. McCay, N.B. Dahatre, J.A. Hapkins, F.D. McCay, M.A,Riley, The influence of metals and carbides during laser surface modifications of low alloy steels, J. of Materials, 34 (23) (1999) 5789 - 5802.