MSA  Vol.6 No.10 , October 2015
Continuous Wave Diode Laser Surface Texturing of Austenitic and Pearlitic Steels
ABSTRACT
Microstructuring of steel resulting in directional solidification and texturing, previously observed in various metallic materials during pulsed laser processing, melt-spinning, high-gradient liquid metal melting, zone melting etc., is reported for the first time in continuous wave diode laser processing of steels. Influence of laser interaction time on surface morphology/topology of austenitic manganese and pearlitic steels is investigated utilizing a wide rectangular multi-mode diode laser beam. X-ray diffraction analysis of the laser treated austenitic steel surface showed strong texturing influence, with preferred crystallographic orientation of γ-Fe crystals in the (200) plane, which increased with interaction time. In case of pearlitic steel, no such texturing influence could be observed. The free surface topologies were also observed to be different in each case, with well-aligned domes of γ-Fe observed in laser treated austenitic steel as compared to randomly oriented fine domes of metal oxides in pearlitic one. In situ surface temperature measurement during laser irradiation indicated higher temperature on pearlitic steel than in austenitic manganese steel owing to its lower effective thermal conductivity associated with higher oxide film formation.

Cite this paper
Shariff, S. , Koppoju, S. , Pal, T. , Gadhe, P. and Joshi, S. (2015) Continuous Wave Diode Laser Surface Texturing of Austenitic and Pearlitic Steels. Materials Sciences and Applications, 6, 889-906. doi: 10.4236/msa.2015.610091.
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