Study of Powder Gas Entrapment and Its Effects on Porosity in 17-4 PH Stainless Steel Parts Fabricated in Laser Powder Bed Fusion
| Autor: | Robin Kuo, Jack Beuth, Elizabeth Larson, Ziheng Wu, Anthony D. Rollett, John L. L. Meyer, Debomita Basu |
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| Rok vydání: | 2020 |
| Předmět: |
Coalescence (physics)
Fusion Morphology (linguistics) Materials science 0211 other engineering and technologies General Engineering 02 engineering and technology 021001 nanoscience & nanotechnology Laser Synchrotron law.invention Metal law visual_art Powder bed visual_art.visual_art_medium General Materials Science Composite material 0210 nano-technology Porosity 021102 mining & metallurgy |
| Zdroj: | JOM. 73:177-188 |
| ISSN: | 1543-1851 1047-4838 |
| DOI: | 10.1007/s11837-020-04491-z |
| Popis: | Powder-entrapped gas, which can occur naturally in gas-atomized powder, can induce porosity in parts fabricated with powder-based metal additive manufacturing processes. This study utilized synchrotron-based x-ray computed tomography and an in situ high-speed imaging technique, dynamic x-ray radiography (DXR), to investigate the formation of powder-induced porosity using 17-4 PH stainless steel powders with a controlled size distribution and intentionally varied entrapped gas contents. While powder with a low entrapped gas content showed no net part porosity increase, the results showed a strong correlation between the porosity in the powder and the porosity in the builds made from powder with a high entrapped gas content relative to typical gas-atomized powder. A threshold value was developed to classify porosity induced by powder-entrapped gas based on pore morphology measured using computed tomography. Transfer and coalescence of pores during laser melting was observed directly with DXR. |
| Databáze: | OpenAIRE |
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