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Proceedings Paper

Melt ejection during single-pulse drilling and percussion drilling of micro holes in stainless steel- and nickel-based superalloy by pulsed Nd:YAG laser radiation
Author(s): Lena Trippe; Jens Willach; Ernst Wolfgang Kreutz; Wolfgang Schulz; J. Petereit; Stefan Kaierle; Reinhart Poprawe
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Paper Abstract

Single pulse drilling and percussion drilling of micro holes (diameter 100 μm, depth 2 mm) with Nd:YAG laser radiation (pulse duration 100 - 500 μs) in stainless steel (X5CrNi18-10) and nickel-based superalloy (CMSX-4) are reported. The development of the hole geometry, especially the hole diameter depending on the focal diameter including caustics and the thickness of the melt at the hole wall, is investigated. The experimental results are compared to the calculations of a physical model describing the motion of the melt front, the phase boundary between liquid and solid. Closures resulting from melt in the hole are detected by recording the expansion of plasma using high speed photography (50000 fps). The quality of drilled holes, e.g. conicity, thickness of recast and closures, is investigated by metallography and optical microscopy. Timescales of physical processes as the onset of melting and vaporization, the time to stationary melt flow and geometrical scales like the hole depth, the closure depth and the hole diameter are determined experimentally and numerically.

Paper Details

Date Published: 8 October 2004
PDF: 7 pages
Proc. SPIE 5662, Fifth International Symposium on Laser Precision Microfabrication, (8 October 2004); doi: 10.1117/12.596578
Show Author Affiliations
Lena Trippe, RWTH-Aachen (Germany)
Jens Willach, RWTH-Aachen (Germany)
Ernst Wolfgang Kreutz, RWTH-Aachen (Germany)
Fraunhofer-Institut fur Lasertechnik (Germany)
Wolfgang Schulz, Fraunhofer-Institut fur Lasertechnik (Germany)
J. Petereit, RWTH-Aachen (Germany)
Stefan Kaierle, Fraunhofer-Institut fur Lasertechnik (Germany)
Reinhart Poprawe, RWTH-Aachen (Germany)
Fraunhofer-Institut fur Lasertechnik (Germany)

Published in SPIE Proceedings Vol. 5662:
Fifth International Symposium on Laser Precision Microfabrication
Isamu Miyamoto; Henry Helvajian; Kazuyoshi Itoh; Kojiro F. Kobayashi; Andreas Ostendorf; Koji Sugioka, Editor(s)

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