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大学・研究所にある論文を検索できる 「Significance of powder feedstock characteristics in defect suppression of additively manufactured Inconel 718」の論文概要。リケラボ論文検索は、全国の大学リポジトリにある学位論文・教授論文を一括検索できる論文検索サービスです。
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Significance of powder feedstock characteristics in defect suppression of additively manufactured Inconel 718

Yufan Zhao Kenta Aoyagi Yohei Daino Kenta Yamanaka Akihiko Chiba 東北大学 DOI:10.1016/j.addma.2020.101277

2020.08

概要

The characteristics of powder applied in electron beam powder-bed fusion (EB-PBF) play a vital role in the process stability and final part performance. We use two types of Inconel 718 alloy powders for experiments, namely, (i) imperfect spherical and (ii) spherical powders. They are different in geometry and built-in defect because of different powder fabrication techniques. The forming qualities concerning surface topography, density, and internal defect of the EB-PBF-built IN718 samples prepared using two types of powders are characterized under the same processing conditions. In particular, the forming qualities of the samples built with each kind of powder, under the optimal process condition, derived by a machine learning method, are further compared. Notably, different powder geometries with different surface features inevitably affect the heat transfer during melting. The significance of powder feedstock characteristics in defect suppression is clarified with the aid of numerical simulations. Under the processing conditions of the present study, compared to those of spherical powders, imperfect spherical powders exhibit low energy absorption rate and low thermal conductivity, making them more likely to evoke lack–of–fusion and excessive melting under low and high energy conditions, respectively. Thus, spherical powders have a broader process window in ensuring a higher density and smoother surface than that of imperfect spherical powders. Moreover, the high cooling and solidification rates in the sample built with spherical powders result in the suppression of the interdendritic void formation.

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