Carbide Precipitation in the Microstructures of Austempered Ductile Irons Containing ۰.۴۸% and ۴.۸۸% Al
- سال انتشار: 1384
- محل انتشار: مجله ی بین المللی انجمن آهن و فولاد ایران، دوره: 2، شماره: 2
- کد COI اختصاصی: JR_ISSIRAN-2-2_001
- زبان مقاله: انگلیسی
- تعداد مشاهده: 170
نویسندگان
Department of Materials Engineering, University of Sistan & Baluchestan, Zahedan, Iran
Department of Materials, University of Leeds, Leeds, UK
چکیده
The influence of aluminium on the microstructure of austempered ductile cast iron (ADI) has been studied. The presence of well distributed graphite in the matrix, and a relatively high volume fraction of retained austenite are responsible for the good mechanical properties of the Aluminium alloyed austempered ductile irons including excellent wear resistance, higher resistance to thermal shock, better graphitising tendency and higher resistance to oxidation at high temperatures. A number of specimens of different composition have been made by green sand-casting and gravity die-casting. The transformation to a bainitic microstructure during austempering under different conditions was then examined for the most successful experimental casts. Austenitising temperature of ۹۲۰°C, and austempering temperatures of ۳۵۰°C at different holding times have been used. Microstructures have been examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Furthermore, it was found that isothermal transformation at ۳۵۰°C for different soaking times gave a typical bainitic microstructure. Extension of isothermal transformation time leads to precipitation of carbides which also depends on the Al concentration.کلیدواژه ها
Aluminium, Austempering, Austenitising, Bainitic Microstructure, Carbide Precipitationاطلاعات بیشتر در مورد COI
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