1
M.Sc. Student, School of Metallurgy and Materials Engineering, Iran University of Science and Technology
2
Professor, School of Metallurgy and Materials Engineering, University of Science and Technology
10.22034/frj.2019.190184.1089
Abstract
The Austempering process that leads to formation of a bainitic microstructure in cast iron is significantly affected by any variation in austempering time and temperature as well as chemical composition of samples. The present work is aimed to reveal the effects introduced by aluminum substitution for silicon in the alloy and austempering treatment on bainite transformation kinetics. Samples of the same size were initially austenitizing at 900°C for 2h in order to achieve a uniform austenitic microstructure, followed by austempering at four upper bainitic temperatures of (375, 400, 425 and 450°C) at various times (1 to 512 min.). Microstructural analyses were carried out by means of optical and electron microscopes and observed that by increasing austempering temperature the thickness of ferritic bainitic plates increases from 0.31 μm in 375°C to 0.63 μm in 450°C. It was concluded that austempering transformation in aluminum ductile cast iron is somehow similar Si cast iron. The difference is that the rate of the first stage of austempering was higher while other stages went through the same rates as the other types of cast iron.
Shakeri,B. and Boutorabi,S. M. A. (2019). Investigation of Microstructure and Hardness of upper Bainitic Austempered Aluminum Ductile Iron (Fe-3.4C-4.3Al-Mg). Founding Research Journal, 3(2), 75-90. doi: 10.22034/frj.2019.190184.1089
MLA
Shakeri,B. , and Boutorabi,S. M. A. . "Investigation of Microstructure and Hardness of upper Bainitic Austempered Aluminum Ductile Iron (Fe-3.4C-4.3Al-Mg)", Founding Research Journal, 3, 2, 2019, 75-90. doi: 10.22034/frj.2019.190184.1089
HARVARD
Shakeri B., Boutorabi S. M. A. (2019). 'Investigation of Microstructure and Hardness of upper Bainitic Austempered Aluminum Ductile Iron (Fe-3.4C-4.3Al-Mg)', Founding Research Journal, 3(2), pp. 75-90. doi: 10.22034/frj.2019.190184.1089
CHICAGO
B. Shakeri and S. M. A. Boutorabi, "Investigation of Microstructure and Hardness of upper Bainitic Austempered Aluminum Ductile Iron (Fe-3.4C-4.3Al-Mg)," Founding Research Journal, 3 2 (2019): 75-90, doi: 10.22034/frj.2019.190184.1089
VANCOUVER
Shakeri B., Boutorabi S. M. A. Investigation of Microstructure and Hardness of upper Bainitic Austempered Aluminum Ductile Iron (Fe-3.4C-4.3Al-Mg). Founding Research Journal, 2019; 3(2): 75-90. doi: 10.22034/frj.2019.190184.1089
