تأثیر افزودن تراشه ماشینکاری سوپر آلیاژ IN718 و نرماله کردن بر ریزساختار و خواص مکانیکی چدن خاکستری هایپریوتکتیک تولیدشده به روش فوم فدا شونده
محورهای موضوعی : ریخته گریمهدی رنجبر 1 , سید حسین رضوی 2 * , زهراسادات سیدرئوفی 3
1 - دانشکده مهندسی مواد و متالورژی، دانشگاه علم و صنعت ایران
2 - دانشگاه علم و صنعت ایران
3 - دانشگاه آزاد کرج-گروه مهندسی مواد، دانشکده فنی و مهندسی دانشگاه آزاد اسلامی واحد کرج
کلید واژه: تراشه ماشینکاری IN718, فصل مشترک, فریت آلوتریوموف, سختی, انرژی ضربه,
چکیده مقاله :
چدن‌های خاکستری به جهت قیمت پایین و سهولت تولید جایگاه ویژهای در صنایع مختلف دارند. به نظر میرسد استفاده از تراشههای ماشینکاری، یک راهکار مناسب برای آلیاژسازی و افزایش خواص مکانیکی چدن‌های خاکستری باشد. در این تحقیق، از تراشههای سوپر آلیاژ IN718 با قرارگیری جهت‌دار در مدل فومی استفاده شد. پس از قرارگیری تراشهها، ریخته‌گری چدن خاکستری GG20 به روش فوم فدا شونده انجام شد. پس از ریخته‌گری نمونه‌ها در دمای ◦C900 نرماله شدند. بررسی‌های ریزساختاری نشان دادند که ساختار در حضور تراشهها، حاوی گرافیتهای نوع A و C و پرلیتهای ظریف می‌شود. همچنین وجود تراشهها باعث برهم زدن تعادل انجماد شده که درنهایت وجود مناطق فریتی در مجاورت تراشهها را درپی دارد. دراثر نرماله کردن، گرافیتهای C نمونه ساده کاملاً حذف شدند، در نمونه مرکب نیز در فصل مشترک فریت آلوتریومورف تشکیل شد و گرافیتهای ظریف نوع A، در زمینهای از پرلیت ظریف توزیع شدند. افزودن تراشه به دلیل ایجاد محلول جامد اشباع موضعی و کامپوزیت سازی باعث افزایش سختی از HB 132 به HB 153 شد، نرماله کردن نیز؛ سختی هر دو نمونه را به ترتیب تا HB 148 و HB 180 افزایش داد. با افزودن تراشه به زمینه که به عنوان مانعی دربرابر رشد ترک عمل می‌کند و باعث به وجود آمدن فازهای نرم و ظریفتر شدن پرلیت و گرافیت شده بود، انرژی ضربه از J 3 به J 3/5 افزایش یافت. با نرماله کردن نیز، انرژی شکست نمونه ساده به J 12/4 و نمونه کامپوزیتی به J 1/6 افزایش یافت.
Cast iron has a special place in various industries due to its low price and production ease. It seems that the use of machining chips is a suitable solution for alloying and increasing the mechanical properties of cast iron. In this research, continuous swarf resulting from IN718 machining with aligned placement in the foam was carried out. After placing the swarf, GG20 cast iron was cast by the lost foam method. After casting, the composite and simple samples were normalized at 900ºC. Microstructural studies were showed that the structure contains type A and C graphites and fine pearlites in the presence of chips. Also, the presence of swarf disturbed the solidification balance, which ultimately resulted in the presence of ferrite areas in the vicinity of the swarfs. As a result of normalization, the C graphites of the simple sample were removed entirely. Allotriomorphic ferrite was formed in the composite sample at the interface, and fine A-type graphites were distributed in fine pearlite matrix. The addition of swarf increased the hardness from 132 to 153 HB due to the creation of local saturated solid solution, compositing, and normalizing due to the mentioned microstructural changes the hardness of both samples increased to 148 and 180HB. Swarf acted as a barrier against crack growth causing the formation of soft phases and finer pearlite and graphite. The sample’s impact energy increased from 3 to 3.5J. With normalizing, the fracture energy of the simple sample increased to 4.12J while the composite sample to 6.1J.
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