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Theoretical and experimental study of bulge formation in laser polishing of 304 stainless steel

机译：304不锈钢激光抛光中凸起的理论与实验研究

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摘要

As an emerging surface treatment process, laser polishing is dedicated to reducing the surface roughness of the sample, but some new surface structures (such as ripples, undercuts, bulges, step structures, and martensite needles) may be introduced into the polished surface, affecting the effect of laser polishing. This work aims to reveal the formation mechanism of bulges in the center of the polished track. The effect of laser polishing process parameters on the size parameters of bulges was studied through experiments of laser polishing. And a twodimensional numerical model was developed by coupling heat transfer and fluid flow. The evolution of bulges, the temperature field, and the velocity field was presented with this model. Furthermore, through the analysis of the surface forces and surface velocities of the molten pool, it was found that the thermocapillary force affected by surface-active elements (oxygen, sulfur, and phosphorus) is the main driving force for the formation of bulges. And some measures to reduce or eliminate bulges were proposed to improve the surface finish of laser polishing. In addition, the final surface profile of the bulges after laser polishing was simulated, which was in good agreement with the experimental results. And this model can be extended to predict the evolution of surface topography in laser polishing, guiding the optimization of process parameters in laser polishing.
机译：作为新出现的表面处理过程，激光抛光专用于降低样品的表面粗糙度，但是一些新的表面结构（例如涟漪，底切，凸起，步骤结构和马氏体针）可以引入抛光表面，影响激光抛光的影响。这项工作旨在揭示抛光轨道中心的凸起的形成机制。通过激光抛光的实验研究了激光抛光工艺参数对凸起尺寸参数的影响。通过耦合传热和流体流动开发了两模州数值模型。提出了该模型的凸起，温度场和速度场的演变。此外，通过分析熔池的表面力和表面速度，发现受表面活性元素（氧气，硫和磷）影响的热量量是用于形成凸起的主要驱动力。提出了一些减少或消除凸起的一些措施，以改善激光抛光的表面光洁度。另外，模拟激光抛光后凸起的最终表面曲线，与实验结果吻合良好。并且该模型可以扩展以预测激光抛光中表面形貌的演变，引导激光抛光中的过程参数的优化。

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  • 来源
    《Journal of Manufacturing Processes》 |2021年第6期|39-52|共14页
  • 作者

    Xu Jilin; Zou Ping; Kang Di; Wang Wenjie;

  • 作者单位

    Northeastern Univ Sch Mech Engn & Automat Shenyang 110819 Peoples R China;

    Northeastern Univ Sch Mech Engn & Automat Shenyang 110819 Peoples R China;

    Northeastern Univ Sch Mech Engn & Automat Shenyang 110819 Peoples R China;

    Northeastern Univ Sch Mech Engn & Automat Shenyang 110819 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Laser polishing; Bulge formation; Numerical model;

    机译：激光抛光;凸起形成;数值模型;

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