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خوردگی و ارتعاش: عوامل موثر بر تغییرات جهتگیری فاز متخلخل در چدن خاکستری | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 13، دوره 52، شماره 3، خرداد 1399، صفحه 703-716 اصل مقاله (690.97 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2018.14718.5918 | ||
| نویسندگان | ||
| مریم اکبری1؛ عسل حسینی منزه* 2 | ||
| 1گروه مواد و متالورژی، دانشکده مهندسی مکانیک و انرژی، پردیس فنی و مهندسی شهید عباسپور، دانشگاه شهید بهشتی، تهران، ایران. | ||
| 2گروه مواد و متالورژی، دانشکده مهندسی مکانیک و انرژی، پردیس فنی و مهندسی شهید عباسپور، دانشگاه شهید بهشتی، تهران، ایران | ||
| چکیده | ||
| چدن خاکستری به دلیل وجود سیلیسیوم، قابلیت ریخته‌گری بالایی دارد. توانایی بالای ماشین‌کاری قطعات خاص این آلیاژ هستند که سبب کاربرد گسترده آن در صنعت گردیده ریخته شده و میرایی ارتعاش دو خاصیت تقریبا است. استفاده از براده‌های ماشین‌کاری به عنوان ماده اولیه ساخت قطعات، در چند سال اخیر مورد توجه محققان قرارگرفته است. در این پژوهش، از براده ماشین‌کاری چدن خاکستری به عنوان ماده اولیه جهت تولید ساختارهای متخلخل استفاده گردید. ساختارهای متخلخل تولیدی تحت دو فرآیند عمده و مخرب صنعتی یعنی خوردگی و ارتعاش به صورت متوالی و موازی قرار داده شد. به منظور نشان دادن قدرت تخریب و مقایسه این فاکتور در این دو فرآیند، تغییرات جهتگیری فاز متخلخل (ناشی از جذب انرژی‌های دو فرآیند مخرب) اندازه گیری گردید. مشاهده گردید بیشترین میزان جذب انرژی که همراه با بیشترین تغییرات در جهتگیری فاز متخلخل می‌باشد؛ تابع میزان تخلخل، نوع فرآیند مخرب و ترتیب اعمال خوردگی و ارتعاش می‌باشد. در حالتی که دو فرآیند ارتعاش و خوردگی به صورت متوالی اعمال شود؛ مکانیزم غالب در اعمال تغییر جهت فاز متخلخل، خوردگی می‌باشد؛ که توانایی کمتری در ایجاد تغییرات ریزساختاری دارد. در صورتی که فرآیندهای مخرب به صورت موازی اعمال شود؛ نمونه‌ای با مقدار متوسط تخلخل 42 ،%بیشترین جذب انرژی را داشته و مکانیزم غالب در این حالت، ارتعاش است. | ||
| کلیدواژه‌ها | ||
| چدن خاکستری؛ میرایی ارتعاش؛ محیط خورنده؛ جهتگیری فاز متخلخل | ||
| عنوان مقاله [English] | ||
| Corrosion and Vibration: Effective Factors on Orientation Changes of Porous Phase in Grey Cast Iron | ||
| نویسندگان [English] | ||
| Maryam Akbari1؛ Asal Hosseini Monazzah2 | ||
| 1Materials and Metallurgy Group, Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, A.C., Tehran,Iran. | ||
| 2Materials and Metallurgy Group, Faculty of Mechanical Energy and Engineering, Shahid Beheshti University, A.C., Tehran, Iran | ||
| چکیده [English] | ||
| Two specific characteristics of grey cast iron, i.e. good machinability, as well as, high vibration damping, results in widespread applications in industry. In this research the grey cast iron powder which was fabricated via machining was utilized as raw material for producing foams. The porous structures were manufactured by powder metallurgy method were subjected under two major industrial destructive processes, i.e., corrosion and vibration, in a continuous and parallel manner. To demonstrate the degradation potency and comparison of these two destructive factors, changes of porous phase orientation as a result of energy absorption was measured. It was found that the amount of energy absorption, which was associated with the most changes in the porous phase orientation, is dependent on porosity volume, the type of destructive processes and the priority of corrosion and vibration. In the case of applying two destructive media successively, the corrosive atmosphere which induced less microstructural changes is the dominant mechanism. If destructive processes were applied in parallel, a sample with a mean value of 42% porosity can absorb the maximum energy, in which vibration is the dominant mechanism for this case. | ||
| کلیدواژه‌ها [English] | ||
| Grey cast iron, Vibration damping, Corrosive atmosphere, Orientation of porous phase | ||
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| مراجع | ||
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