23 December 2017 Polarization effects associated with thermal processing of HY-80 structural steel using high-power laser diode array
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Abstract
Localized heating of roughened steel surfaces using highly divergent laser light emitted from high-power laser diode arrays was experimentally demonstrated and compared with theoretical predictions. Polarization dependence was analyzed using Fresnel coefficients to understand the laser-induced temperature rise of HY-80 steel plates under 383- to 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. The efficient use of diode arrays for laser-assisted advanced manufacturing technologies, such as hybrid friction stir welding, is discussed.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Sheldon S.Q. Wu, Bradford W. Baker, Mark D. Rotter, Alexander M. Rubenchik, Maxwell E. Wiechec, Zachary M. Brown, Raymond J. Beach, Manyalibo J. Matthews, "Polarization effects associated with thermal processing of HY-80 structural steel using high-power laser diode array," Optical Engineering 56(12), 124108 (23 December 2017). https://doi.org/10.1117/1.OE.56.12.124108 . Submission: Received: 8 August 2017; Accepted: 28 November 2017
Received: 8 August 2017; Accepted: 28 November 2017; Published: 23 December 2017
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