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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical simulation of heat transfer and fluid flow during nanosecond pulsed laser processing of Fe_(78)Si_9B_(13) amorphous alloys
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Numerical simulation of heat transfer and fluid flow during nanosecond pulsed laser processing of Fe_(78)Si_9B_(13) amorphous alloys

机译：纳秒脉冲激光加工过程中传热与流体流动的数值模拟Fe_（78）Si_9b_（13）非晶合金

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摘要

Nanosecond pulsed laser processing is a promising method to modify the microstructure of amorphous alloy. However, the heat and mass transfer mechanisms during processing are still unclear, which prevent regulating the microstructure precisely. In this study, a 3D heat transfer and flow coupling model is established to investigate the heat transfer and fluid flow behaviors, and their effects on the surface morphology and microstructure formation during the nanosecond pulsed laser processing of Fe_(78)Si_9B_(13) amorphous alloy. The physical processes such as melting and solidification, melt evaporation, melt convection and heat conduction, as well as the main driving forces such as surface tension, recoil pressure and gravity are taken into account in this model. The simulation morphology is in good agreement with the experimental results, indicating the validity of this numerical model. Based on simulation data analysis, it is found that the evolution mechanism of surface morphology is mainly related to the recoil pressure caused by evaporation and the Marangoni effect induced by the surface tension spatial gradient. Combined the temperature field analysis with experimental characterization, the formation mechanism of new amorphous phase in the molten zone (cooling rate at the order of 10~7 K/s) and the precipitation behavior of α-Fe(Si)/Fe-B phase nanocrystals in the heat-affected zone are clarified.
机译：纳秒脉冲激光加工是修饰非晶合金微观结构的有希望的方法。然而，加工过程中的热量和传质机制仍然不清楚，防止精确调节微观结构。在该研究中，建立了3D传热和流动耦合模型来研究传热和流体流动，以及它们对Fe_（78）Si_9B_（13）无定形的纳秒脉冲激光加工过程中的表面形态和微观结构形成的影响。合金。在该模型中考虑了熔融和凝固，熔融蒸发，熔体对流和导热，熔化，熔体对流和导热，以及诸如表面张力，反冲压力和重力的主驱动力的物理过程。模拟形态与实验结果吻合良好，表明该数值模型的有效性。基于仿真数据分析，发现表面形态的进化机制主要与蒸发引起的反冲压力与表面张力空间梯度引起的牛龙龙效应相关。结合实验表征的温度场分析，熔融区中新非晶相的形成机制（10〜7 k / s阶的冷却速率）和α-Fe（Si）/ Fe-B相的沉淀行为澄清了热影响区中的纳米晶体。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第5期|121003.1-121003.13|共13页
  • 作者

    Lingyu Guo; Shaoning Geng; Xuesong Gao; Weimin Wang;

  • 作者单位

    The State Key Laboratory of Digital Manufacturing Equipment and Technology. School of Mechanical Science and Engineering Huazhong University of Science & Technology Wuhan 430074 PR China;

    The State Key Laboratory of Digital Manufacturing Equipment and Technology. School of Mechanical Science and Engineering Huazhong University of Science & Technology Wuhan 430074 PR China;

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan 250061 PR China;

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan 250061 PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fe-based amorphous alloy; Nanosecond pulsed laser processing; Numerical simulation; Fluid flow; Heat transfer;

    机译：Fe型无定形合金;纳秒脉冲激光加工;数值模拟;流体流动;传播热量;

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