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.
Highlights
Surface morphology/topology is a significant factor influencing the optical, tribological, mechanical and manyHow to cite this paper: Shariff, S.M., et al (2015) Continuous Wave Diode Laser Surface Texturing of Austenitic and Pearlitic Steels
In view of the increasing relevance of understanding the texturing effects during laser treatment of steels and to exploit the favorable properties that they can yield, the present study aims to assess the influence of diode laser processing on texturing of austenitic manganese and pearlitic steels
At critical processing condition, a unique self-aligned wavy pattern in melted surface was observed in austenitic steel with highly protruded crests as compared to moderately rough texture in pearlitic steel
Summary
Surface morphology/topology is a significant factor influencing the optical, tribological, mechanical and many. In view of the increasing relevance of understanding the texturing effects during laser treatment of steels and to exploit the favorable properties that they can yield, the present study aims to assess the influence of diode laser processing on texturing of austenitic manganese and pearlitic steels. Such a texturing study involving two different steels having contrasting thermophysical properties is expected to facilitate an improved understanding. The effect of interaction time on the evolving surface topology/texture and microstructure utilizing a wide area multimode diode laser beam is investigated
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
