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Effect of Returnable Material in Batch on Hot Tearing Tendency of AlSi9Cu3 Alloy

The main reason for the use of returnable material, or recycled alloys, is a cost reduction while maintaining the final properties of the casting. The casting resulting quality is directly related to the correct ratio of commercial grade alloy and alloy made by remelting the returnable material in t...

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Autores principales: Kasińska, Justyna, Matejka, Marek, Bolibruchová, Dana, Kuriš, Michal, Širanec, Lukáš
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8037858/
https://www.ncbi.nlm.nih.gov/pubmed/33805006
http://dx.doi.org/10.3390/ma14071583
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author Kasińska, Justyna
Matejka, Marek
Bolibruchová, Dana
Kuriš, Michal
Širanec, Lukáš
author_facet Kasińska, Justyna
Matejka, Marek
Bolibruchová, Dana
Kuriš, Michal
Širanec, Lukáš
author_sort Kasińska, Justyna
collection PubMed
description The main reason for the use of returnable material, or recycled alloys, is a cost reduction while maintaining the final properties of the casting. The casting resulting quality is directly related to the correct ratio of commercial grade alloy and alloy made by remelting the returnable material in the batch. The casting quality is also affected by the purity of the secondary raw materials used, the shape complexity and the use of the casting itself. The presented article focuses on the effect of increasing the returnable material content in the batch on the hot tearing susceptibility of AlSi9Cu3 alloy. Hot tears are a complex phenomenon that combines metallurgical and thermo-mechanical interactions of the cast metal. Hot tearing susceptibility was evaluated on the basis of quantitative (HTS—hot tearing susceptibility index) and qualitative evaluation. The negative effect of returnable material in the batch was already manifested at a 20% content in the batch. The critical proportion of the returnable alloy in the batch can be stated as 50%. The alloy with a 50% returnable material content manifested insufficient results of the HTS index and qualitative evaluation, which means increased sensitivity to tearing. The negative effect of returnable material and the increased sensitivity were also confirmed in the evaluation of the fracture surface and hot tear profile. The microstructure of alloys with 50% and higher proportion of returnable material was characterized by a higher amount of iron phases (mainly Al(5)FeSi), whose sharp ends acted as critical regions of hot tearing and subsequent hot tear propagation, which had a major impact on the increase in hot tearing susceptibility.
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spelling pubmed-80378582021-04-12 Effect of Returnable Material in Batch on Hot Tearing Tendency of AlSi9Cu3 Alloy Kasińska, Justyna Matejka, Marek Bolibruchová, Dana Kuriš, Michal Širanec, Lukáš Materials (Basel) Article The main reason for the use of returnable material, or recycled alloys, is a cost reduction while maintaining the final properties of the casting. The casting resulting quality is directly related to the correct ratio of commercial grade alloy and alloy made by remelting the returnable material in the batch. The casting quality is also affected by the purity of the secondary raw materials used, the shape complexity and the use of the casting itself. The presented article focuses on the effect of increasing the returnable material content in the batch on the hot tearing susceptibility of AlSi9Cu3 alloy. Hot tears are a complex phenomenon that combines metallurgical and thermo-mechanical interactions of the cast metal. Hot tearing susceptibility was evaluated on the basis of quantitative (HTS—hot tearing susceptibility index) and qualitative evaluation. The negative effect of returnable material in the batch was already manifested at a 20% content in the batch. The critical proportion of the returnable alloy in the batch can be stated as 50%. The alloy with a 50% returnable material content manifested insufficient results of the HTS index and qualitative evaluation, which means increased sensitivity to tearing. The negative effect of returnable material and the increased sensitivity were also confirmed in the evaluation of the fracture surface and hot tear profile. The microstructure of alloys with 50% and higher proportion of returnable material was characterized by a higher amount of iron phases (mainly Al(5)FeSi), whose sharp ends acted as critical regions of hot tearing and subsequent hot tear propagation, which had a major impact on the increase in hot tearing susceptibility. MDPI 2021-03-24 /pmc/articles/PMC8037858/ /pubmed/33805006 http://dx.doi.org/10.3390/ma14071583 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/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/ (https://creativecommons.org/licenses/by/4.0/) ).
spellingShingle Article
Kasińska, Justyna
Matejka, Marek
Bolibruchová, Dana
Kuriš, Michal
Širanec, Lukáš
Effect of Returnable Material in Batch on Hot Tearing Tendency of AlSi9Cu3 Alloy
title Effect of Returnable Material in Batch on Hot Tearing Tendency of AlSi9Cu3 Alloy
title_full Effect of Returnable Material in Batch on Hot Tearing Tendency of AlSi9Cu3 Alloy
title_fullStr Effect of Returnable Material in Batch on Hot Tearing Tendency of AlSi9Cu3 Alloy
title_full_unstemmed Effect of Returnable Material in Batch on Hot Tearing Tendency of AlSi9Cu3 Alloy
title_short Effect of Returnable Material in Batch on Hot Tearing Tendency of AlSi9Cu3 Alloy
title_sort effect of returnable material in batch on hot tearing tendency of alsi9cu3 alloy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8037858/
https://www.ncbi.nlm.nih.gov/pubmed/33805006
http://dx.doi.org/10.3390/ma14071583
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