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Modelling the Mechanical Attributes (Roughness, Strength, and Hardness) of Al-alloy A356 during Sand Casting

Sand-casting is a well established primary process for manufacturing various parts of A356 alloy. However, the quality of the casting is adversely affected by the change in the magnitude of the control variables. For instance, a larger magnitude of pouring velocity induces a drop effect and a lower...

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Published in:Materials 2020-01, Vol.13 (3), p.598
Main Authors: Ishfaq, Kashif, Ali, Muhammad Asad, Ahmad, Naveed, Zahoor, Sadaf, Al-Ahmari, Abdulrahman M, Hafeez, Faisal
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description Sand-casting is a well established primary process for manufacturing various parts of A356 alloy. However, the quality of the casting is adversely affected by the change in the magnitude of the control variables. For instance, a larger magnitude of pouring velocity induces a drop effect and a lower velocity increases the likelihood of cold-shut and mis-run types of defects. Similarly, a high pouring temperature causes the formation of hot tears, whereas a low temperature is a source of premature solidification. Likewise, a higher moisture content yields microcracks (due to gas shrinkages) in the casting and a lower moisture content results in the poor strength of the mold. Therefore, the appropriate selection of control variables is essential to ensure quality manufactured products. The empirical relations could provide valuable guidance in this regard. Additionally, although the casting process was optimized for A356 alloy, it was mostly done for a single response. Therefore, this paper aimed to formulate empirical relations for the contradictory responses, i.e., hardness, ultimate tensile strength and surface roughness, using the response surface methodology. The experimental results were comprehensively analyzed using statistical and scanning electron microscopic analyses. Optimized parameters were proposed and validated to achieve castings with high hardness (84.5 HB) and strength (153.5 MPa) with minimum roughness (5.8 µm).
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1996-1944
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source Publicly Available Content Database; PubMed Central; Free Full-Text Journals in Chemistry
subjects Alloys
Aluminum base alloys
Casting
Casting alloys
Castings
Empirical analysis
Hardness
Impact strength
Low temperature
Manufacturing
Mechanical properties
Microcracks
Moisture content
Optimization
Permeability
Porosity
Pouring
Response surface methodology
Sand casting
Solidification
Surface roughness
Tensile strength
Ultimate tensile strength
title Modelling the Mechanical Attributes (Roughness, Strength, and Hardness) of Al-alloy A356 during Sand Casting
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