تحلیل حساسیت متغیرهای عملیات حرارتی بر خواص آلیاژ آلومینیم سرسیلندر به‌روش رگرسیون

نوع مقاله : علمی و پژوهشی

نویسندگان

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

چکیده

در این مقاله به‌روش تحلیل رگرسیون، الگوهای مناسبی برای سختی و ریزساختار آلیاژ آلومینیم سرسیلندر ارائه شده است. توابع هدف، سختی، اندازۀ فازها و میزان کروی‌بودن و متغیرها در آزمایش‌های تجربی شامل دما و زمان انحلال و پیرسازی انتخاب شدند. نتایج نشان داد که بیشینه سختی (164ویکرز) زمانی به‌دست می­آید که نمونه 300دقیقه در دمای C° 510 قرار گیرد و سپس، در دمای C° 175 به‌مدت 360دقیقه پیرسخت شود. همچنین، عملیات حرارتی بهینه برای دستیابی به کمترین اندازۀ مساحت فازها و کروی‌تربودن فازها مشخص شد. نتایج تحلیل رگرسیون نشان داد که زمان پیرسختی مؤثرتر از دما در تغییرات سختی است و دمای انحلال نسبت به دمای پیرسختی فاکتور مهم‌تری محسوب می‌شود.

کلیدواژه‌ها


عنوان مقاله [English]

Sensitivity Analysis of Heat Treatment Parameters on Cylinder-head Aluminum Alloy Properties by Regression Method

نویسندگان [English]

  • Mohammad jafar Sharifi 1
  • Mohammad Azadi 2
  • Mahboobeh Azadi 3
1 Faculty of Mechanical Engineering, Semnan University, Semnan, Iran.
2 Faculty of Mechanical Engineering, Semnan University, Semnan, Iran.
3 Faculty of Material and Metallurgical Engineering, Semnan University, Semnan, Iran.
چکیده [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.

کلیدواژه‌ها [English]

  • aluminum alloy
  • sensitivity analysis
  • Heat treatment
  • Microstructure
  • Hardness
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