Elucidating the impact of severe oxidation on the powder properties and laser melting behaviors
In this work, commercial 316L stainless steel (SS) powder was used to experimentally determine the impacts of severe oxidation on the powder characteristics and laser powder bed fusion (L-PBF) melting behaviors. The morphology, surface state, and laser absorptivity of both virgin and oxidized powder...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-09-01
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| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127522005810 |
| _version_ | 1798037072272949248 |
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| author | Weiwei Zhou Nina Takase Mingqi Dong Naoki Watanabe Suxia Guo Zhenxing Zhou Naoyuki Nomura |
| author_facet | Weiwei Zhou Nina Takase Mingqi Dong Naoki Watanabe Suxia Guo Zhenxing Zhou Naoyuki Nomura |
| author_sort | Weiwei Zhou |
| collection | DOAJ |
| description | In this work, commercial 316L stainless steel (SS) powder was used to experimentally determine the impacts of severe oxidation on the powder characteristics and laser powder bed fusion (L-PBF) melting behaviors. The morphology, surface state, and laser absorptivity of both virgin and oxidized powders were systematically characterized. Their impacts on the flowability and powder bed quality were monitored by custom-designed recoating experiments and powder shear tests. The results of an in situ wetting analysis and microstructure evaluation were compared to establish a correlation between the powder characteristics and laser fusion. The powder oxidation enhanced L-PBF processability by improving the homogeneity of powder spreading and the formation of stable, consecutive laser beads. A thin ceramic layer-coated SS alloy reinforced with uniform (Si, Mn)-based oxides was synthesized by the L-PBF processing of severely oxidized powders. The mechanical strength of this alloy was found to be similar to that processed using the virgin powders, whereas the elongation was slightly decreased, likely due to the amorphous oxide feature and the mechanical oxide-Fe interface. This study provides a systematic understanding of powder reuse and new insight into the potential for economically developing high-performance parts by the positive utilization of powder oxidation and the L-PBF process. |
| first_indexed | 2024-04-11T21:20:47Z |
| format | Article |
| id | doaj.art-da790aacecd84e95a452058ae198682c |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-04-11T21:20:47Z |
| publishDate | 2022-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-da790aacecd84e95a452058ae198682c2022-12-22T04:02:37ZengElsevierMaterials & Design0264-12752022-09-01221110959Elucidating the impact of severe oxidation on the powder properties and laser melting behaviorsWeiwei Zhou0Nina Takase1Mingqi Dong2Naoki Watanabe3Suxia Guo4Zhenxing Zhou5Naoyuki Nomura6Department of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai 980-8579, JapanDepartment of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai 980-8579, JapanDepartment of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai 980-8579, JapanDepartment of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai 980-8579, JapanDepartment of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai 980-8579, JapanDepartment of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai 980-8579, JapanCorresponding author.; Department of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai 980-8579, JapanIn this work, commercial 316L stainless steel (SS) powder was used to experimentally determine the impacts of severe oxidation on the powder characteristics and laser powder bed fusion (L-PBF) melting behaviors. The morphology, surface state, and laser absorptivity of both virgin and oxidized powders were systematically characterized. Their impacts on the flowability and powder bed quality were monitored by custom-designed recoating experiments and powder shear tests. The results of an in situ wetting analysis and microstructure evaluation were compared to establish a correlation between the powder characteristics and laser fusion. The powder oxidation enhanced L-PBF processability by improving the homogeneity of powder spreading and the formation of stable, consecutive laser beads. A thin ceramic layer-coated SS alloy reinforced with uniform (Si, Mn)-based oxides was synthesized by the L-PBF processing of severely oxidized powders. The mechanical strength of this alloy was found to be similar to that processed using the virgin powders, whereas the elongation was slightly decreased, likely due to the amorphous oxide feature and the mechanical oxide-Fe interface. This study provides a systematic understanding of powder reuse and new insight into the potential for economically developing high-performance parts by the positive utilization of powder oxidation and the L-PBF process.http://www.sciencedirect.com/science/article/pii/S0264127522005810Laser powder bed fusionStainless steelOxidationMicrostructuresPowder flowability |
| spellingShingle | Weiwei Zhou Nina Takase Mingqi Dong Naoki Watanabe Suxia Guo Zhenxing Zhou Naoyuki Nomura Elucidating the impact of severe oxidation on the powder properties and laser melting behaviors Materials & Design Laser powder bed fusion Stainless steel Oxidation Microstructures Powder flowability |
| title | Elucidating the impact of severe oxidation on the powder properties and laser melting behaviors |
| title_full | Elucidating the impact of severe oxidation on the powder properties and laser melting behaviors |
| title_fullStr | Elucidating the impact of severe oxidation on the powder properties and laser melting behaviors |
| title_full_unstemmed | Elucidating the impact of severe oxidation on the powder properties and laser melting behaviors |
| title_short | Elucidating the impact of severe oxidation on the powder properties and laser melting behaviors |
| title_sort | elucidating the impact of severe oxidation on the powder properties and laser melting behaviors |
| topic | Laser powder bed fusion Stainless steel Oxidation Microstructures Powder flowability |
| url | http://www.sciencedirect.com/science/article/pii/S0264127522005810 |
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