Effects on the distortion of Inconel 718 components along a hybrid laser-based additive manufacturing process chain using laser powder bed fusion and laser metal deposition
Effects on the distortion of Inconel 718 components along a hybrid laser-based additive manufacturing process chain using laser powder bed fusion and laser metal deposition
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DOI：
10.1007/s40964-021-00171-9
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发表时间：
2021-02
影响因子：
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通讯作者：
E. Uhlmann;J. Düchting;T. Petrat;Erwin Krohmer;B. Graf;M. Rethmeier
中科院分区：
文献类型：
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作者：
E. Uhlmann;J. Düchting;T. Petrat;Erwin Krohmer;B. Graf;M. Rethmeier
以其几何自由度和精度而闻名的激光粉末床熔合 (LPBF) 与以其高堆积率而闻名的基于喷嘴的激光金属沉积工艺 (LMD) 的结合，在减少大型金属零件的增材制造时间方面具有巨大的潜力。对于LPBF-LMD混合工艺链的工业应用，有必要研究LMD工艺对LPBF基板的影响。此外，构建板材料对增材制造工艺链中变形的发生也有重大影响。在文献中，钢构建板通常用于基于激光的 Inconel 718 增材制造工艺，因为可以保证良好的冶金结合，同时降低构建板的生产和修复成本。本文研究了 LMD 材料沉积引起的变形以及混合增材制造工艺链中构建板材料的影响。双悬臂由 LPBF 制造，随后使用 LMD 沉积附加层。变形是在竣工条件以及热处理后测量的。确定了不同 LMD 填充策略对失真的影响。实验使用镍基合金 Inconel 718 进行。结果显示 LMD 路径策略对变形有显着影响，较短的刀具路径可减少变形。热处理后的剩余变形很大程度上取决于构建板的材料。
The combination of laser powder bed fusion (LPBF), known for its geometrical freedom and accuracy, and the nozzle-based laser metal deposition process (LMD), known for its high build-up rates, has great potential to reduce the additive manufacturing times for large metallic parts. For the industrial application of the LPBF-LMD hybrid process chain, it is necessary to investigate the influence of the LMD process on the LPBF substrate. In addition, the build plate material also has a significant impact on the occurrence of distortion along the additive manufacturing process chain. In the literature, steel build plates are often used in laser-based additive manufacturing processes of Inconel 718, since a good metallurgical bonding can be assured whilst reducing costs in the production and restoration of the build plates. This paper examines the distortion caused by LMD material deposition and the influence of the build plate material along the hybrid additive manufacturing process chain. Twin cantilevers are manufactured by LPBF and an additional layer is subsequently deposited with LMD. The distortion is measured in the as-built condition as well as after heat treatment. The effect of different LMD hatch strategies on the distortion is determined. The experiments are conducted using the nickel-base alloy Inconel 718. The results show a significant influence of LMD path strategies on distortion, with shorter tool paths leading to less distortion. The remaining distortion after heat treatment is considerably dependent on the material of the build plate.