تحلیل حساسیت زمان انحلال، دمای پیرسازی و افزودن نانوذرات خاک رس بر سختی آلیاژ آلومینیوم- سیلیسیم پیستون به‌روش آنالیز رگرسیون

نوع مقاله : علمی و پژوهشی

نویسندگان

دانشکده مهندسی مکانیک، دانشگاه سمنان، سمنان.

چکیده

در این مقاله، به تحلیل حساسیت پارامترهای عملیات حرارتی شامل زمان انحلال، دمای پیرسازی و نیز افزودن نانوذرات بر سختی آلیاژ آلومینیوم- سیلیسیم (AlSi12CuNiMg) پیستون موتور خودرو به‌روش آنالیز رگرسیون پرداخته شده است. بدین‌منظور، از نانوذرات خاک رس به‌مقدار 1 درصد وزنی جهت ساخت نانوکامپوزیت پایه‌فلزی، استفاده شده و نمونه‌های استاندارد، با روش ریخته‌گری گردابی و گرانشی ساخته شدند. به‌منظور یافتن شرایط بهینه عملیات حرارتی جهت دستیابی به بیشترین مقدار سختی، فرآیند انحلال با دمای 500 درجه سانتی‌گراد به‌مدت 1، 3 و 5 ساعت و نیز فرآیند پیرسازی با دماهای 200، 215 و 230 درجه سانتی‌گراد به‌مدت 6 ساعت برروی آلیاژ پایه و نیز نانوکامپوزیت پایه‌فلزی، اعمال گردید. نتایج تجربی نشان داد که دمای پیرسازی، پارامتری با بیشترین تأثیر و زمان انحلال و نیز افزودن نانوذرات، پارامترهایی با کمترین میزان تأثیر بر سختی آلیاژ بوده‌اند. همچنین، زمان 5 ساعت برای فرآیند انحلال و دمای 200 درجه سانتی‌گراد برای فرآیند پیرسازی، شرایط بهینه برای عملیات حرارتی بوده و موجب دستیابی به بیشترین میزان سختی شده‌اند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Sensitivity Analysis of Solutioning Time, Ageing Temperature, and Clay Nano-Particles Addition on Hardness of Piston Aluminum-Silicon Alloy using Regression Method

نویسندگان [English]

  • Hamed Bahmanabadi
  • Mohammad Azadi
Faculty of Mechanical Engineering, Semnan University, Semnan, Iran.
چکیده [English]

In this article, the sensitivity analysis of heat treatment parameters including the solutioning time, ageing temperature, and addition of nano-particles on the hardness of the piston aluminum-silicon alloy (AlSi12CuNiMg) were characterized using regression analysis method. For such an objective, the clay nano-particles with 1 wt. % were used to fabricate the metal-matrix nano-composites and the standard specimens were produced using the gravity and stir-casting methods. To find the superior heat treatment conditions for aiming the maximum hardness, the solution treatment was performed at 500 ℃ for 1, 3, and 5 hours and the ageing treatment was done at 200, 215, and 230 ℃ for 6 hours on the base alloy and the metal-matrix nano-composites. Experimental results showed that the ageing treatment had the most effect on the material hardness and the solutioning time and nano-particles addition were the less effective parameters on the alloy hardness. The optimum heat treatment conditions achieved by the solutioning time of 5 hours and the ageing temperature of 200 ℃, during heat-treating which led to have the maximum hardness.

کلیدواژه‌ها [English]

  • Aluminum-Silicon alloy
  • Regression analysis
  • Engine piston
  • Heat treatment
  • Clay nano-particles
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