Aluminum alloys are widely preferred in industrial applications such as automotive, defence and aerospace industries because of their advanced characteristics such as high specific strength, corrosion resistance, and castability. Cast aluminum alloys are frequently heat-treated to change their mechanical properties.
In this study, the effects of stress-relief heat treatment on the microstructural and mechanical properties of aluminum cast alloy were investigated. A356 aluminum cast alloy samples were stresss-relieved for 30 minutes to 3 hours at 200 °C, 250 °C, and 300 °C. The optimal stress-relief heat treatment parameters for an A356 aluminum alloy were identified in this work using the time-temperature relationship.
Hardness values were measured at the end of stress-relief heat treatment and shown. Also, tensile tests were carried out to the samples. In addition, microstructural characteristics were investigated by optical microscopy and the grains were observed after stress-relief heat treatment. The mechanical properties and microstructures of stress-relief heat treated and non-heat treated samples were compared.
The results of appropriate stress-relief heat treatment condition parameters which obtained from this investigation study applied to the aluminum alloy wheels and all mechanical test applied to the product. After the mechanical test, ultimate tensile strength, yield strength and elongation values were compared with non-heat treated and typical T6 heat treated aluminium alloy wheels.
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