Effect of runner thickness and hydrogen content on the mechanical properties of A356 alloy castings

Journal article

El-Sayed, M., Essa, K. and Hassanin, H. 2021. Effect of runner thickness and hydrogen content on the mechanical properties of A356 alloy castings . International Journal of Metalcasting. https://doi.org/10.1007/s40962-021-00753-x
AuthorsEl-Sayed, M., Essa, K. and Hassanin, H.
Abstract

Earlier studies demonstrated the detrimental effect of entrained bifilm defects on aluminum cast alloys’ tensile and fatigue properties. It was suggested that hydrogen has a contributing role as it diffuses into the bifilms and swells them out to form hydrogen porosity. In this study, the effect of the runner height and hydrogen content on the properties of A356 alloy castings was investigated using a two-level full factorial design of experiments. Four responses, the Weibull modulus and position parameter of both the ultimate tensile strength (UTS) and % elongation, were assessed. The results suggested that decreasing the runner height and adopting procedures intended to decrease the hydrogen content of the casting caused a considerable enhancement of the Weibull moduli and position parameters of the UTS and % elongation. This was reasoned to the more quiescent practice during mold filling, eliminating the possibility of bifilm formation as well as the decreased hydrogen level that eliminated the amount of hydrogen diffused into the bifilms and accordingly decreased the size of the entrained defects. This, in turn, would allow the production of A356 cast alloys with better and more reproducible properties.

KeywordsBifilm; A356 alloy; Hydrogen; Design of experiments; Mechanical properties
Year2021
JournalInternational Journal of Metalcasting
PublisherSpringer Nature
ISSN1939-5981
2163-3193
Digital Object Identifier (DOI)https://doi.org/10.1007/s40962-021-00753-x
Official URLhttps://doi.org/10.1007/s40962-021-00753-x
Publication dates
Online24 Jan 2022
Publication process dates
Accepted28 Dec 2021
Deposited05 Jan 2022
Publisher's version
License
Output statusPublished
References

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