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POSSIBILITIES OF AUSTEMPERED DUCTILE IRON (ADI) PRODUCTION
Abstract
ADI (Austempered Ductile Iron) - a bainitic ductile iron in which the resulting structure is obtained by the isothermal decay of austenite in the bainite region is currently a very promising material, which has a very wide application in various industries. It is characterized by a particularly favorable combination of strength and ductility, which exceeds the properties of heat-treated steels in the strength range of 800 - 1500 MPa. Its production is problematic because the ferritic or ferritic-pearlitic SGI (spheroidal graphite iron), which is a precursor in the preparation of ADI cast iron, has to meet demanding metallurgical properties, especially as many regular graphite globules evenly distributed in the matrix. The aim of this article is to present a method of metallurgical processing of SGI in such a way as to ensure the quality of the melt required for the preparation of ADI cast iron with respect to elimination of environmental impacts, i.e. inmold modification, as traditional SGI production causes exothermic reaction. work environment. Another possibility to influence the metallurgical quality of SGI cast iron is the action a magnetic field acting on the solidifying melt of SGI, which leads to improvement the metallurgical as well as mechanical properties of SGI.
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References14
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