The ultrashort pulsed laser ablation process is a well-established micromachining process and has been at the center of manufacturing research in the past decade. However, it has its own limitations, primarily due to the involvement of various material-specific laser and machining process parameters. The laser-induced plasma micromachining (LIP-MM) is a novel tool-less and multimaterial selective material removal type of micromachining process. In a manner similar to ultrashort pulsed laser ablation, it also removes material through an ultrashort pulsed laser beam. However, instead of direct laser–matter interaction, it uses the laser beam to generate plasma within a transparent dielectric media that facilitates material removal through plasma–matter interaction and thus circumvents some of the limitations associated with the ultrashort pulsed laser ablation process. This paper presents an experimental investigation on the comparative assessment of the capabilities of the two processes in the machining of microchannels in stainless steel. For this purpose, microchannels were machined by the two processes at similar pulse energy levels and feed-rate values. The comparative assessment was based on the geometric characteristics, material removal rate (MRR), heat-affected zone and shock-affected zone (HAZ, SAZ), and the range of machinable materials.
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September 2014
This article was originally published in
Journal of Micro and Nano-Manufacturing
Research-Article
Comparative Assessment of the Laser-Induced Plasma Micromachining and the Ultrashort Pulsed Laser Ablation Processes
Kumar Pallav,
Kumar Pallav
1
Department of Mechanical Engineering,
e-mail: kumarpallav2008@u.northwestern.edu
Northwestern University
,Evanston, IL 60208
e-mail: kumarpallav2008@u.northwestern.edu
1Corresponding author.
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Ishan Saxena,
Ishan Saxena
Department of Mechanical Engineering,
Northwestern University
,Evanston, IL 60208
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Kornel F. Ehmann
Kornel F. Ehmann
Department of Mechanical Engineering,
Northwestern University
,Evanston, IL 60208
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Kumar Pallav
Department of Mechanical Engineering,
e-mail: kumarpallav2008@u.northwestern.edu
Northwestern University
,Evanston, IL 60208
e-mail: kumarpallav2008@u.northwestern.edu
Ishan Saxena
Department of Mechanical Engineering,
Northwestern University
,Evanston, IL 60208
Kornel F. Ehmann
Department of Mechanical Engineering,
Northwestern University
,Evanston, IL 60208
1Corresponding author.
Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MICRO- AND NANO-MANUFACTURING. Manuscript received October 28, 2013; final manuscript received May 21, 2014; published online July 8, 2014. Assoc. Editor: Nicholas Fang.
J. Micro Nano-Manuf. Sep 2014, 2(3): 031001 (9 pages)
Published Online: July 8, 2014
Article history
Received:
October 28, 2013
Revision Received:
May 21, 2014
Citation
Pallav, K., Saxena, I., and Ehmann, K. F. (July 8, 2014). "Comparative Assessment of the Laser-Induced Plasma Micromachining and the Ultrashort Pulsed Laser Ablation Processes." ASME. J. Micro Nano-Manuf. September 2014; 2(3): 031001. https://doi.org/10.1115/1.4027738
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