کاوش تجربی اثر بهره‌برداری بر خواص مکانیکی و ارتعاشی DIN X12CrNi2521 در شرایط فوق گرمایش

نوع مقاله : مقاله علمی پژوهشی

نویسندگان

1 دانشجو دکترا، دانشکده مهندسی مکانیک و انرژی، دانشگاه شهید بهشتی، تهران

2 دانشیار، دانشکده مهندسی مکانیک و انرژی،دانشگاه شهید بهشتی، تهران

چکیده

ایده ‌اصلی این پژوهش، برپایه ارتباط بین خواص ارتعاشی و مکانیکی ماده و تغییرات ساختاری آن در اثر بهره‌برداری در دماهای بالا استوار است. در این راستا نمونه‌هایی از فولاد DIN X12CrNi2521 در 3 دمای کاری مختلف به مدت‌ 3 شبانه روز پیرسازی شدند که منجر به تشکیل رسوبات و افزایش فاز سیگما گردید. با مقایسه نتایج حاصل از آزمون‌های تجربی، شاهد افزایش فرکانس طبیعی 5 مود اول، ضرایب میرایی، مدول کشسانی و سختی ویکرز با افزایش دمای ‌پیرسازی خواهیم بود. این پژوهش، امکان‌سنجی تدوین روشی نوین و غیرمخرب جهت تخمین عمر باقیمانده را با استفاده از ضرایب میرایی در شرایط بهره‌برداری فوق ‌گرمایش قطعات‌ نیروگاهی بررسی می‌نماید.

کلیدواژه‌ها

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