جستجوی مقالات مرتبط با کلیدواژه "فروسیلیسیم زیرکونیم دار" در نشریات گروه "مواد و متالورژی"

In this paper, the effects grain refiner amount and its addition method and the wall thickness on the solidification microstructure ‎of austenitic granular cast iron with 5 weight percent manganese were investigated. For this purpose, the inoculation was ‎performed with ferrosilicon zirconium after spheroidizing with ferrosilicon magnesium. The grain refiner additions were ‎performed using two basic method, ladle inoculation and pouring stream inoculation in different amounts (0, 0.1, 0.2 and 0.3% ‎by weight). In addition, the casting process was performed in the step form sand-sodium silicate binder mold with 5, 10 and 20 ‎mm thicknesses. Microstructural evaluations and hardness measuring were achieved using the optical and electron microscopes, ‎EDS, MIP4 visual analysis and Rockwell C test method. The results showed that the as cast microstructure of the cast iron ‎consists of granular graphite and eutectic carbide at the pearlitic matrix. The amount of eutectic carbides and graphite nodule ‎count increase and the amount of pearlite and the size of the graphite’s decrease by decreasing the mold thickness. For all wall ‎thicknesses, the inoculation process decreases the amount of eutectic carbide and graphite size and increases the graphite nodule ‎count and its volume fraction. In addition, it was observed that the pouring stream inoculation is more effective than the ladle ‎inoculation. ‎