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Behavior of Aluminum Alloy Castings under Different Pouring Temperatures and Speeds

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Author(s): Mohammad B. NDALIMAN | Akpan P. PIUS

Journal: Leonardo Electronic Journal of Practices and Technologies
ISSN 1583-1078

Volume: 6;
Issue: 11;
Start page: 71;
Date: 2007;
Original page

Keywords: Pouring Temperature | Pouring Speed | Ultimate Tensile Strength | Rockwell Hardness | Percentage Elongation | Percentage Reduction in Area

ABSTRACT
The investigation studies the effect of pouring temperatures and rates on the mechanical properties of Aluminum alloy castings. The castings were produced at different pouring temperatures and speeds. The speed range is 2.0 cm/s to 16.0 cm/s, while the temperature range for the investigation is 680oC to 750oC. The specimens were subsequently tested for quality and properties such as hardness and strength. Observations and results indicated that lower pouring temperatures, nearer to the melting temperatures of the alloys produced good quality castings with the optimum values of hardness and strength as 65.5 and 112 N/mm2 respectively. The optimum pouring speed is in the range of 2.2 cm/s to 2.8cm/s, where the hardness and strength were 65.4 and 127 N/mm2 respectively.