نوع مقاله : مقاله پژوهشی
نویسندگان
1 کارشناسی ارشد، مهندسی مواد ، دانشگاه صنعتی همدان، همدا ن.
2 استادیار، مهندسی مواد و متالورژی، دانشگاه صنعتی همدان ، همدا ن.
چکیده
کامپوزیت‌های زمینه آهنی حاوی ذرات سخت در برابر سایش خراشان مقاومت خوبی دارند و یکی از روش‌های تولید آنها ریخته‌گری-رخنه‌دهی است که توانایی ساخت قطعات تقویت شده موضعی با کامپوزیت‌ها را دارد. در این پژوهش رخنه‌دهی مذاب چدن خاکستری درون اسکلت متخلخلی از براده‌های فولاد زنگ‌نزن 304 بررسی شده است. مذاب چدن توسط نیروهای مویینگی به دورن اسکلت متخلخل کشیده شد. در دمای رخنه‌دهی مذاب چدن خاکستری با براده جامد فولاد 304 در تماس بود. به دلیل نفوذ عنصر کروم به عنوان یک عنصر کاربیدزا و نیکل به درون مذاب چدن خاکستری، ترکیب شیمایی آن تغییر کرده و مشابه ترکیب چدن‌های سفید Ni-Hard شده بود. با نفوذ و تبادل عناصر آلیاژی کامپوزیت زمینه آهنی با ذرات سخت کاربید کروم-آهن M7C3 و زمینه‌ی فریتی-آستنیتی به دست آمد. مکانیسم تشکیل و نوع و سختی فازها و نواحی مختلف با میکروسکوپ نوری و الکترونی و XRD و میکروسختی سنجی مورد بررسی قرار گرفت. با توجه به قیمت نسبتا پایین چدن خاکستری و ضایعاتی بودن براده‌های تراشکاری فولاد زنگ‌نزن می‌توان گفت که روشی برای تولید قطعات اقتصادی تقویت شده با کامپوزیت‌های سطحی پیشنهاد شده است.
کلیدواژه‌ها
عنوان مقاله [English]
Feasibility of Production of an iron-base Metal Matrix Composite by Infiltration of molten Gray Cast Iron into a 304 Stainless Steel Porous Skeleton
نویسندگان [English]
- Raziye Avand 1
- Ahmad Ghaedri Hamidi 2
- Mahdi Pourabdoli 2
1 Department of Materials Science and Engineering, Hamedan University of Technology, Hamedan, Iran.
2 Department of Materials Science and Engineering, Hamedan University of Technology, Hamedan, Iran.
چکیده [English]
Iron-based metal matrix composites containing hard particles have good resistance to abrasive wear. One of their production methods is infiltration-casting, which has the ability to produce surface composites reinforced parts. In this Article research , the infiltration of molten gray cast iron melt into a porous skeleton of compacted swarfs of 304 stainless steel has been investigated. The molten cast iron melt was pulled into the porous skeleton by capillary forces. At the infiltration temperature of the molten gray cast iron melt, it was in contact with the solid skeleton of 304 steel. Due to the diffusion of chromium as a carbide-maker element and nickel element into the molten gray cast iron, its chemical composition changed and became similar to the composition of white Ni-Hard cast irons. By diffusion and exchange of alloying elements, an iron matrix with hard chromium-iron carbide (M7C3) particles and a ferritic-austenitic matrix were obtained. The microstructure development formation, type, and hardness of different phases were examined with light and electron microscopy, XRD, and microhardness measurement. Due to the relatively low price of gray cast iron and the waste stainless steel turning chips, it can be said that a method has been proposed to produce economical parts reinforced with surface composites.
کلیدواژه‌ها [English]
- Iran-Matrix Composites
- Chromium Carbides
- Infiltration-Casting
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