Type

Conference Proceedings

Authors

Dermot Brabazon
Sumsun Naher
Evans Chikarakara

Subjects

Engineering

Topics
materials melt pool size surface roughness analysis surface microstructure co2 pulsed laser processing 316l stainless steel energy levels laser irradiation

Analysis of microstructural changes during pulsed CO2 laser surface processing of AISI 316L stainless steel (2009)

Abstract In the present contribution, a 1.5kW CO2 laser in pulsed wave mode was used to study the effects of laser processing parameters at specific energy fluence. Cylindrical AISI 316L stainless steel samples rotating perpendicular to the laser irradiation direction were used for these experiments. A surface temperature prediction model was implemented to set the experimental process parameters. Laser processing of AISI 316L steel showed a strong correlation between melt pool depth and the residence time at specific fluence levels. At fixed energy fluence, increase in residence time resulted in growth of the melt pool depth. In the melted region, the microstructure was observed to be of more uniform composition and contain fewer impurities. To improve absorption level, samples were etched and roughened. These samples exhibited lower roughness levels compared to the un-treated samples. For a constant fluence level, samples with improved absorption displayed an increase in depth of melt pool at lower peak powers and higher residence time. As the laser beam interaction time increased, the surface roughness of the steel increased for the various pulse energy levels examined. While the structure of the surface was seen to retain a crystal arrangement, grain orientation changes were observed in the laser processed region.
Collections Ireland -> Dublin City University -> Publication Type = Conference or Workshop Item
Ireland -> Dublin City University -> Status = Published
Ireland -> Dublin City University -> Subject = Engineering: Materials
Ireland -> Dublin City University -> DCU Faculties and Centres = Research Initiatives and Centres: Materials Processing Research Centre (MPRC)
Ireland -> Dublin City University -> Subject = Engineering
Ireland -> Dublin City University -> DCU Faculties and Centres = Research Initiatives and Centres

Full list of authors on original publication

Dermot Brabazon, Sumsun Naher, Evans Chikarakara

Experts in our system

1
Dermot Brabazon
Dublin City University
Total Publications: 162
 
2
Sumsun Naher
Dublin City University
Total Publications: 56