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

机译:使用大功率激光二极管阵列对HY-80结构钢进行热处理的偏振效应

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摘要

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.
机译:实验证明了使用大功率激光二极管阵列发出的高度发散的激光对粗糙的钢表面进行局部加热,并将其与理论预测进行了比较。使用菲涅耳系数分析了偏振依赖性,以了解HY-80钢板在383-612 W激光辐照下的激光诱导温度升高。使用体热电偶探头和热成像直接测量了激光诱导的瞬态温度分布。有限元分析使用吸光度作为调整参数,对HY-80钢中的能量沉积和热传递进行了定量评估。与部分氧化的铁表面一致,对于S偏振光,提取的吸收率值在0.62到0.75之间,对于P偏振光,吸收率在0.63到0.85之间。使用电子反向散射衍射的微结构分析显示了在最高温度条件下(612 W,P极化)的热影响区,表明有快速淬火和奥氏体向马氏体转变的迹象。讨论了将二极管阵列有效地用于激光辅助的先进制造技术,例如混合摩擦搅拌焊接。

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