The Kinetics Transformation of a Low Alloy Cast Iron
Journal Title: RECENT - Year 2012, Vol 13, Issue 34
Abstract
The Austempered Ductile Iron (ADI) obtained by heat treating and isothermal hardening, is the material, which combines a lot of the superior attributes of classical Ductile Irons or forged irons, being in a serious competition with the iron used by the moment in the automotive industry. The paper presents an application for calculating the kinetics and thermodynamics parameters in the case of a phase transformation in solid state in A.D.I. S.G. grade. The studied cast iron has the following chemical composition (% in weight): 3.73% C; 2.77% Si; 0.44% Mn; 0.057% P; 0.009% S; 0.047% Mg; 0.23% Cu; 0.15% Ni; 0.10% Cr. This cast iron was made in an induction furnace. The isothermal bainitic transformation in a Ni-Cu S.G. cast iron was studied in the temperature range of 375-400 oC and with maintaining time between 1 to 60 minutes. It is pointed out the influence of some factors (the temperature and the maintained time at the isothermal level) on the phase transformation and properties in the studied cast iron. By the help of Johnson-Mehl-Avrami equation it was described the kinetics of austenitization of S.G. Cast Iron and it was determined the reaction exponent “n” and the bainitic reaction rate "k".
Authors and Affiliations
Ioan MILOŞAN
Keywords
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