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Effect of Flow State of Pure Aluminum and A380 Alloy on Porosity of High Pressure Die Castings

Air entrapment defects prevent the heat treatment from improving the mechanical properties of die castings, which limits the die casting of high-performance components. The flow pattern of the filling process is complicated and experimental analysis is difficult in thin-walled complex die castings....

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Autores principales: Cao, Hanxue, Wang, Chengcheng, Che, Junqi, Luo, Ziwei, Wang, Luhan, Xiao, Lang, Wang, Jing, Hu, Tao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6947587/
https://www.ncbi.nlm.nih.gov/pubmed/31888154
http://dx.doi.org/10.3390/ma12244219
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author Cao, Hanxue
Wang, Chengcheng
Che, Junqi
Luo, Ziwei
Wang, Luhan
Xiao, Lang
Wang, Jing
Hu, Tao
author_facet Cao, Hanxue
Wang, Chengcheng
Che, Junqi
Luo, Ziwei
Wang, Luhan
Xiao, Lang
Wang, Jing
Hu, Tao
author_sort Cao, Hanxue
collection PubMed
description Air entrapment defects prevent the heat treatment from improving the mechanical properties of die castings, which limits the die casting of high-performance components. The flow pattern of the filling process is complicated and experimental analysis is difficult in thin-walled complex die castings. In this study, we constructed a shock absorption tower to observe in real-time the filling process of pure aluminum and A380 aluminum alloy at different fast injection speeds. The degree of breakup of pure aluminum was larger than that of A380 during the filling process, which caused the porosity of pure aluminum to be greater than that of the A380 at each observation position. Re-Oh diagrams explained the difference in porosity between the two metals. The porosity in different regions was closely related to the flow state of aluminum liquid. In addition to porosity measurements, we specifically analyzed the relationship between the porosity of the flowback zone, the final filling zone, and the near-tail zone of cylinder. At the same injection velocity, the porosity at flowback zone was greater than that at the final filling position, the porosity at final filling position was larger than that at the near-tail zone of cylinder, and the final filling position changed as the injection velocity changed.
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spelling pubmed-69475872020-01-13 Effect of Flow State of Pure Aluminum and A380 Alloy on Porosity of High Pressure Die Castings Cao, Hanxue Wang, Chengcheng Che, Junqi Luo, Ziwei Wang, Luhan Xiao, Lang Wang, Jing Hu, Tao Materials (Basel) Article Air entrapment defects prevent the heat treatment from improving the mechanical properties of die castings, which limits the die casting of high-performance components. The flow pattern of the filling process is complicated and experimental analysis is difficult in thin-walled complex die castings. In this study, we constructed a shock absorption tower to observe in real-time the filling process of pure aluminum and A380 aluminum alloy at different fast injection speeds. The degree of breakup of pure aluminum was larger than that of A380 during the filling process, which caused the porosity of pure aluminum to be greater than that of the A380 at each observation position. Re-Oh diagrams explained the difference in porosity between the two metals. The porosity in different regions was closely related to the flow state of aluminum liquid. In addition to porosity measurements, we specifically analyzed the relationship between the porosity of the flowback zone, the final filling zone, and the near-tail zone of cylinder. At the same injection velocity, the porosity at flowback zone was greater than that at the final filling position, the porosity at final filling position was larger than that at the near-tail zone of cylinder, and the final filling position changed as the injection velocity changed. MDPI 2019-12-16 /pmc/articles/PMC6947587/ /pubmed/31888154 http://dx.doi.org/10.3390/ma12244219 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Cao, Hanxue
Wang, Chengcheng
Che, Junqi
Luo, Ziwei
Wang, Luhan
Xiao, Lang
Wang, Jing
Hu, Tao
Effect of Flow State of Pure Aluminum and A380 Alloy on Porosity of High Pressure Die Castings
title Effect of Flow State of Pure Aluminum and A380 Alloy on Porosity of High Pressure Die Castings
title_full Effect of Flow State of Pure Aluminum and A380 Alloy on Porosity of High Pressure Die Castings
title_fullStr Effect of Flow State of Pure Aluminum and A380 Alloy on Porosity of High Pressure Die Castings
title_full_unstemmed Effect of Flow State of Pure Aluminum and A380 Alloy on Porosity of High Pressure Die Castings
title_short Effect of Flow State of Pure Aluminum and A380 Alloy on Porosity of High Pressure Die Castings
title_sort effect of flow state of pure aluminum and a380 alloy on porosity of high pressure die castings
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6947587/
https://www.ncbi.nlm.nih.gov/pubmed/31888154
http://dx.doi.org/10.3390/ma12244219
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