نوع مقاله : علمی و پژوهشی
1 کارشناسی ارشد، دانشکده مهندسی مکانیک، دانشگاه سمنان، سمنان.
2 دانشکده مهندسی مکانیک، دانشگاه سمنان، سمنان.
3 دانشکده مهندسی مواد و متالورژی، دانشگاه سمنان، سمنان
عنوان مقاله [English]
In this article, by the regression analysis, suitable patterns for the hardness and the microstructure of the cylinder-head aluminum alloy have been presented. Objective functions were the hardness, the phase size and the spherical degree and variables were selected as the temperature and the time for the solution and ageing, in experiments. Results showed that the highest hardness (164 VHN) obtained when the sample was heated at 510°C for 300 minutes; then, aged for 360 minutes at 175°C. The optimal heat treatment was determined to achieve the smallest value of the phase area, as well as a higher amount of spherical phases. Results of the regression analysis demonstrated that the ageing time was more effective than the temperature in hardness variations, and the solution temperature was more important than the ageing temperature.
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