Influence of Gas Flow Speed on Laser Plume Attenuation and Powder Bed Particle Pickup in Laser Powder Bed Fusion
Using gas flow to reduce laser plume attenuation is critical in the process control of laser powder bed fusion (LPBF) of metal powders. First, this work investigated Hastelloy X (HX) samples built at different gas flow speeds. Higher porosity with lack of fusion defects was found in the samples buil...
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| Veröffentlicht in: | JOM (1989) 2020-03, Vol.72 (3), p.1039-1051 |
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| container_end_page | 1051 |
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| container_title | JOM (1989) |
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| creator | Shen, Haopeng Rometsch, Paul Wu, Xinhua Huang, Aijun |
| description | Using gas flow to reduce laser plume attenuation is critical in the process control of laser powder bed fusion (LPBF) of metal powders. First, this work investigated Hastelloy X (HX) samples built at different gas flow speeds. Higher porosity with lack of fusion defects was found in the samples built at lower gas flow speeds, which indicates a significant influence of laser plume attenuation. Then, particle pickup experiments were conducted to investigate the limit of further increasing the gas flow speed without disturbing the powder bed. Eight different powders of four alloys (Al, Ti, steel, and Ni) with mean sizes ranging from 25 µm to 118 µm were studied. A model was introduced to predict the pickup speeds of different powders. Lastly, a method based on porosity and particle pickup speed was proposed for the reference of setting the lower and upper limits of gas flow speed in LPBF. |
| doi_str_mv | 10.1007/s11837-020-04020-y |
| format | Article |
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First, this work investigated Hastelloy X (HX) samples built at different gas flow speeds. Higher porosity with lack of fusion defects was found in the samples built at lower gas flow speeds, which indicates a significant influence of laser plume attenuation. Then, particle pickup experiments were conducted to investigate the limit of further increasing the gas flow speed without disturbing the powder bed. Eight different powders of four alloys (Al, Ti, steel, and Ni) with mean sizes ranging from 25 µm to 118 µm were studied. A model was introduced to predict the pickup speeds of different powders. 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| ispartof | JOM (1989), 2020-03, Vol.72 (3), p.1039-1051 |
| issn | 1047-4838 1543-1851 |
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| source | SpringerLink Journals - AutoHoldings |
| subjects | Alloy powders Alloy steels Attenuation Chemistry/Food Science Earth Sciences Engineering Environment Gas flow Hastelloy (trademark) Lasers Metal powders Nickel Physics Porosity Powder beds Process controls Rapid prototyping Researchers Reynolds number The 2nd Asia-Pacific International Conference on Additive Manufacturing (APICAM 2019) Titanium |
| title | Influence of Gas Flow Speed on Laser Plume Attenuation and Powder Bed Particle Pickup in Laser Powder Bed Fusion |
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