Phase Transformation in Austempered Ductile Irons
Journal Title: RECENT - Year 2013, Vol 14, Issue 39
Abstract
Austempered Ductile Iron (A.D.I.) with a bainitic matrix, obtained by heat treatment and isothermal hardening is the material which combines a lot of superior attributes of the classical cast iron or forged iron, being in a serious competition with the iron used by the moment in the automotive industry. Austempered ductile irons usually contain a large quantity of retained austenite that can help to optimise their mechanical properties. Many of the properties of austempered ductile iron depend on the austenite which is retained following the bainite reaction. The paper presents a study that determines the influence of the heat treatment parameters over the the volume fraction of the retained Austenite (Vγr) and of the Carbon content (Cγ) of the retained austenite. The studied cast iron has the following chemical composition (% in weight): 3.70% C; 2.46% Si; 0.56 % Mn; 0.038% P; 0.009%S; 0.062%Mg; 0.21% Mo 0.12% Ni, 0.17% Cu. This cast iron was made in an induction furnace. Nodular changes were obtained with the "In mold" method, with the help of prealloy FeSiCuMg with 10-16% Mg, added into the reaction chamber in a proportion of 1.1% of the treated cast iron.
Authors and Affiliations
Ioan MILOŞAN
Keywords
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