A Smoothed Particle Hydrodynamics Model for Laser Beam Melting of Ni-based Alloy 718
A Smoothed Particle Hydrodynamics Model for Laser Beam Melting of Ni-based Alloy 718
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DOI：
10.1016/j.camwa.2018.10.020
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发表时间：
2019-10
期刊：
影响因子：
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通讯作者：
Johannes Weirather;V. Rozov;Mario Wille;Paul Schuler;C. Seidel;N. Adams;M. Zaeh
中科院分区：
文献类型：
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作者：
Johannes Weirather;V. Rozov;Mario Wille;Paul Schuler;C. Seidel;N. Adams;M. Zaeh
激光束熔化（LBM）-也称为选择性激光熔化（SLM）-是一种增材制造（AM）技术，属于粉末床熔化（PBF）工艺。在这项工作中，LBM过程的数值模拟模型的基础上，无网格计算方法光滑粒子流体动力学（SPH）在多相和弱可压缩制剂。它的实现利用图形处理单元（GPU）的并行化能力，以实现减少计算时间。物理现象，如热传导，熔化和再凝固，对流和表面张力的影响，如热毛细作用。此外，还考虑了原子从熔池表面蒸发产生的反冲压力的影响。通过温度相关函数对所研究的合金Inconel® 718（分别为合金718）的相关材料特性（例如动态粘度、导热率和吸收率）进行建模。基础材料数据来源于文献。模拟结果与实验结果进行了比较，单熔体轨道，以评估模型的有效性方面的工艺参数扫描速度和激光功率。
Laser Beam Melting (LBM) – also referred to as Selective Laser Melting (SLM) – is an Additive Manufacturing (AM) technology and pertains to the Powder Bed Fusion (PBF) processes. Within this work a numerical simulation model of the LBM process based on the meshless computational method Smoothed Particle Hydrodynamics (SPH) in a multi-phase and weakly-compressible formulation is presented. Its implementation utilizes the parallelization capabilities of Graphics Processing Units (GPU) for achieving a reduced computation time. Physical phenomena such as thermal conduction, melting and re-solidification, convection and effects related to surface tension such as thermocapillarity are considered. Furthermore, the influence of the recoil pressure induced by evaporating atoms from the melt pool surface is taken into account. The material properties of relevance (e.g. dynamic viscosity, thermal conductivity and absorptivity) for the investigated alloy Inconel® 718 (respectively Alloy 718) are modeled by means of temperature-dependent functions. The underlying material data originate from literature. The simulation results are compared with experimental findings for single melt tracks to evaluate the model validity with regard to the process parameters scanning velocity and laser power.