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首页> 外文期刊>Journal of Applied Physics >Role of melt behavior in modifying oxidation distribution using an interface incorporated model in selective laser melting of aluminum-based material
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Role of melt behavior in modifying oxidation distribution using an interface incorporated model in selective laser melting of aluminum-based material

机译：使用界面结合模型在铝基材料的选择性激光熔融中，熔融行为在改变氧化分布中的作用

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摘要

A transient three dimensional model for describing the molten pool dynamics and the response of oxidation film evolution in the selective laser melting of aluminum-based material is proposed. The physical difference in both sides of the scan track, powder-solid transformation and temperature dependent physical properties are taken into account. It shows that the heat energy tends to accumulate in the powder material rather than in the as-fabricated part, leading to the formation of the asymmetrical patterns of the temperature contour and the attendant larger dimensions of the molten pool in the powder phase. As a higher volumetric energy density is applied (≥1300 J/mm~3), a severe evaporation is produced with the upward direction of velocity vector in the irradiated powder region while a restricted operating temperature is obtained in the as-fabricated part. The velocity vector continuously changes from upward direction to the downward one as the scan speed increases from 100mm/s to 300mm/s, promoting the generation of the debris of the oxidation films and the resultant homogeneous distribution state in the matrix. For the applied hatch spacing of 50 μm, a restricted remelting phenomenon of the as-fabricated part is produced with the upward direction of the convection flow, significantly reducing the turbulence of the thermal-capillary convection on the breaking of the oxidation firms, and therefore, the connected oxidation films through the neighboring layers are typically formed. The morphology and distribution of the oxidation are experimentally acquired, which are in a good agreement with the results predicted by simulation.
机译：提出了一种瞬态三维模型，用于描述铝基材料选择性激光熔化过程中的熔池动力学和氧化膜演变的响应。考虑了扫描轨迹两侧的物理差异，粉末-固体相变和与温度有关的物理特性。结果表明，热能倾向于在粉末材料中而不是在制成的部分中积聚，从而导致温度轮廓的不对称图案的形成以及粉末相中熔池的较大尺寸。当施加更高的体积能量密度（≥1300J / mm〜3）时，在辐照的粉末区域中，随着速度矢量的向上方向产生严重的蒸发，而在制成的部件中获得受限的工作温度。随着扫描速度从100mm / s增加到300mm / s，速度矢量从向上方向连续变化到向下方向，从而促进了氧化膜碎屑的产生以及在基质中形成的均匀分布状态。对于50μm的施加的舱口间距，在对流向上的方向上会产生成品零件的受限重熔现象，从而显着减少了热毛细对流对氧化公司的破坏所产生的湍流，因此然后，通常形成穿过相邻层的连接的氧化膜。实验获得了氧化的形态和分布，与模拟预测的结果非常吻合。

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  • 来源
    《Journal of Applied Physics》 |2016年第8期|083104.1-083104.11|共11页
  • 作者

    Dongdong Gu; Donghua Dai;

  • 作者单位

    College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Yudao Street 29, Nanjing 210016, People's Republic of China,Institute of Additive Manufacturing (3D Printing), Nanjing University of Aeronautics and Astronautics, Yudao Street 29, Nanjing 210016, People's Republic of China;

    College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Yudao Street 29, Nanjing 210016, People's Republic of China,Institute of Additive Manufacturing (3D Printing), Nanjing University of Aeronautics and Astronautics, Yudao Street 29, Nanjing 210016, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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