Molten pool behavior and effect of fluid flow on solidification conditions in selective electron beam melting (SEBM) of a biomedical Co-Cr-Mo alloy
Selective electron beam melting (SEBM) is a type of additive manufacturing (AM) that involves multiple physical processes. Because of its unique process conditions compared to other AM processes, a detailed investigation into the molten pool behavior and dominant physics of SEBM is required. Fluid c...
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| Published in | Additive manufacturing Vol. 26; pp. 202 - 214 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
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Elsevier B.V
01.03.2019
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| Abstract | Selective electron beam melting (SEBM) is a type of additive manufacturing (AM) that involves multiple physical processes. Because of its unique process conditions compared to other AM processes, a detailed investigation into the molten pool behavior and dominant physics of SEBM is required. Fluid convection involves mass and heat transfer; therefore, fluid flow can have a profound effect on solidification conditions. In this study, computational thermal-fluid dynamics simulations with multi-physical modeling and proof-of-concept experiments were used to analyze the molten pool behavior and resultant thermal conditions related to solidification. The Marangoni effect of molten metal primarily determines fluid behavior and is a critical factor affecting the molten pool instability in SEBM of the Co–Cr–Mo alloy. The solidification parameters calculated from simulated data, especially the solidification rate, are sensitive to the local fluid flow at the solidification front. Combined with experimental analysis, the results presented herein indicate that active fluid convection at the solidification front increase the probability of new grain formation, which suppresses the epitaxial growth of columnar grains. |
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| AbstractList | Selective electron beam melting (SEBM) is a type of additive manufacturing (AM) that involves multiple physical processes. Because of its unique process conditions compared to other AM processes, a detailed investigation into the molten pool behavior and dominant physics of SEBM is required. Fluid convection involves mass and heat transfer; therefore, fluid flow can have a profound effect on solidification conditions. In this study, computational thermal-fluid dynamics simulations with multi-physical modeling and proof-of-concept experiments were used to analyze the molten pool behavior and resultant thermal conditions related to solidification. The Marangoni effect of molten metal primarily determines fluid behavior and is a critical factor affecting the molten pool instability in SEBM of the Co–Cr–Mo alloy. The solidification parameters calculated from simulated data, especially the solidification rate, are sensitive to the local fluid flow at the solidification front. Combined with experimental analysis, the results presented herein indicate that active fluid convection at the solidification front increase the probability of new grain formation, which suppresses the epitaxial growth of columnar grains. |
| Author | Zhao, Yufan Koizumi, Yuichiro Aoyagi, Kenta Yamanaka, Kenta Chiba, Akihiko Wei, Daixiu |
| Author_xml | – sequence: 1 givenname: Yufan orcidid: 0000-0002-6211-6207 surname: Zhao fullname: Zhao, Yufan organization: Department of Materials Processing, Graduate School of Engineering, Tohoku University, 6-6-11 Aoba, Aramaki, Aoba-ku, Sendai, 980-8579, Japan – sequence: 2 givenname: Yuichiro surname: Koizumi fullname: Koizumi, Yuichiro email: ykoizumi@mat.eng.osaka-u.ac.jp organization: Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan – sequence: 3 givenname: Kenta surname: Aoyagi fullname: Aoyagi, Kenta organization: Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan – sequence: 4 givenname: Daixiu orcidid: 0000-0003-0264-462X surname: Wei fullname: Wei, Daixiu organization: Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan – sequence: 5 givenname: Kenta orcidid: 0000-0003-1675-4731 surname: Yamanaka fullname: Yamanaka, Kenta organization: Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan – sequence: 6 givenname: Akihiko surname: Chiba fullname: Chiba, Akihiko organization: Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan |
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| Keywords | Selective electron beam melting Computational thermal-fluid dynamics Molten pool behavior Solidification conditions |
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| SubjectTerms | Computational thermal-fluid dynamics Molten pool behavior Selective electron beam melting Solidification conditions |
| Title | Molten pool behavior and effect of fluid flow on solidification conditions in selective electron beam melting (SEBM) of a biomedical Co-Cr-Mo alloy |
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