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Title: Polarization effects associated with thermal processing of HY-80 structural steel using high-power laser diode array

Abstract

Localized heating of roughened steel surfaces using disperse laser light emitted from high power laser diode arrays was experimentally demonstrated and compared with theoretical predictions. The Fresnel equations were used to analyze the optical absorptivity in terms of the angle of incidence and polarization state to understand the laser-induced temperature rise of HY-80 steel plates under 383-612 W laser irradiation. Laser-induced, transient temperature distributions were directly measured using bulk thermocouple probes and thermal imaging. Finite element analysis yielded quantitative assessment of energy deposition and heat transport in HY-80 steel using absorptivity as a tuning parameter. The extracted absorptivity values ranged from 0.62 to 0.75 for S-polarized and 0.63 to 0.85 for P-polarized light, in agreement with partially oxidized iron surfaces. Microstructural analysis using electron backscatter diffraction revealed a heat affected zone for the highest temperature conditions (612 W, P-polarized) as evidence of rapid quenching and an austenite to martensite transformation. In conclusion, the efficient use of diode arrays for laser-assisted advanced manufacturing technologies such as hybrid friction stir welding is discussed.

Authors:
 [1];  [2];  [1];  [1];  [2];  [2];  [1];  [1]
  1. Lawerence Livermore National Laboratory, Livermore, California
  2. United States Naval Academy, Annapolis, Maryland
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1420299
Report Number(s):
LLNL-JRNL-694017
Journal ID: ISSN 0091-3286
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Optical Engineering
Additional Journal Information:
Journal Volume: 56; Journal Issue: 12; Journal ID: ISSN 0091-3286
Publisher:
SPIE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 36 MATERIALS SCIENCE; Laser diode arrays; Laser materials processing; Physical optics, polarization; Thermal effects

Citation Formats

Wu, Sheldon S. Q., Baker, Bradford W., Rotter, Mark D., Rubenchik, Alexander M., Wiechec, Maxwell E., Brown, Zachary M., Beach, Raymond J., and Matthews, Manyalibo J. Polarization effects associated with thermal processing of HY-80 structural steel using high-power laser diode array. United States: N. p., 2017. Web. doi:10.1117/1.OE.56.12.124108.
Wu, Sheldon S. Q., Baker, Bradford W., Rotter, Mark D., Rubenchik, Alexander M., Wiechec, Maxwell E., Brown, Zachary M., Beach, Raymond J., & Matthews, Manyalibo J. Polarization effects associated with thermal processing of HY-80 structural steel using high-power laser diode array. United States. doi:10.1117/1.OE.56.12.124108.
Wu, Sheldon S. Q., Baker, Bradford W., Rotter, Mark D., Rubenchik, Alexander M., Wiechec, Maxwell E., Brown, Zachary M., Beach, Raymond J., and Matthews, Manyalibo J. Fri . "Polarization effects associated with thermal processing of HY-80 structural steel using high-power laser diode array". United States. doi:10.1117/1.OE.56.12.124108. https://www.osti.gov/servlets/purl/1420299.
@article{osti_1420299,
title = {Polarization effects associated with thermal processing of HY-80 structural steel using high-power laser diode array},
author = {Wu, Sheldon S. Q. and Baker, Bradford W. and Rotter, Mark D. and Rubenchik, Alexander M. and Wiechec, Maxwell E. and Brown, Zachary M. and Beach, Raymond J. and Matthews, Manyalibo J.},
abstractNote = {Localized heating of roughened steel surfaces using disperse laser light emitted from high power laser diode arrays was experimentally demonstrated and compared with theoretical predictions. The Fresnel equations were used to analyze the optical absorptivity in terms of the angle of incidence and polarization state to understand the laser-induced temperature rise of HY-80 steel plates under 383-612 W laser irradiation. Laser-induced, transient temperature distributions were directly measured using bulk thermocouple probes and thermal imaging. Finite element analysis yielded quantitative assessment of energy deposition and heat transport in HY-80 steel using absorptivity as a tuning parameter. The extracted absorptivity values ranged from 0.62 to 0.75 for S-polarized and 0.63 to 0.85 for P-polarized light, in agreement with partially oxidized iron surfaces. Microstructural analysis using electron backscatter diffraction revealed a heat affected zone for the highest temperature conditions (612 W, P-polarized) as evidence of rapid quenching and an austenite to martensite transformation. In conclusion, the efficient use of diode arrays for laser-assisted advanced manufacturing technologies such as hybrid friction stir welding is discussed.},
doi = {10.1117/1.OE.56.12.124108},
journal = {Optical Engineering},
number = 12,
volume = 56,
place = {United States},
year = {2017},
month = {12}
}

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