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Special Section Papers

Large-Area Electron Beam Melting: Frequency Analysis and Critical Frequency Prediction

[+] Author and Article Information
Brodan Richter

Department of Mechanical Engineering,
University of Wisconsin–Madison,
Madison, WI 53706

Frank E. Pfefferkorn

Department of Mechanical Engineering,
University of Wisconsin–Madison,
Madison, WI 53706
e-mail: frank.pfefferkorn@wisc.edu

1Corresponding author.

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MICRO-AND NANO-MANUFACTURING. Manuscript received November 2, 2018; final manuscript received March 2, 2019; published online April 11, 2019. Assoc. Editor: Irene Fassi.

J. Micro Nano-Manuf 7(1), 010906 (Apr 11, 2019) (4 pages) Paper No: JMNM-18-1035; doi: 10.1115/1.4043236 History: Received November 02, 2018; Revised March 02, 2019

During large-area electron beam irradiation, high energy flux pulses of electrons melt a thin layer of material. The objective of this work is to analyze the spatial frequencies of a turned, S7 tool steel surface before and after electron beam melting. It was observed that high frequency features are significantly reduced following melting, but lower frequency features were created and increased the unfiltered areal average roughness. Previous work on laser remelting-based polishing derived a critical frequency that defines the frequency above which higher frequency features are dampened. As the critical frequency depends on the melt duration that the surface experiences, a one-dimensional, transient temperature prediction model was created for this work to estimate the melt time for a single electron beam pulse. This model allowed for the calculation of a critical frequency that showed good ability to predict the frequencies that are dampened.

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References

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Figures

Grahic Jump Location
Fig. 1

Probability distribution function of electron beam absorption

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Fig. 2

Temperature of the sample at various depths

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Fig. 3

Measured surface topography (a) before and (b) after electron beam polishing

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Fig. 4

Power spectrum of frequencies in the Y-direction

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Fig. 5

Power spectrum of frequencies in the X-direction

Tables

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