Thermal and microstructural characterization of a novel ductile cast iron modified by aluminum addition

Gülşah Aktaş Çelik; Maria-Ioanna T. Tzini; Şeyda Polat; Ş. Hakan Atapek; Gregory N. Haidemenopoulos

doi:10.1007/s12613-019-1876-8

Volume 27 Issue 2

Feb. 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(2): 190-199

Gülşah Aktaş Çelik, Maria-Ioanna T. Tzini, Şeyda Polat, Ş. Hakan Atapek, and Gregory N. Haidemenopoulos, Thermal and microstructural characterization of a novel ductile cast iron modified by aluminum addition, Int. J. Miner. Metall. Mater., 27(2020), No. 2, pp. 190-199. https://doi.org/10.1007/s12613-019-1876-8

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Gülşah Aktaş Çelik, Maria-Ioanna T. Tzini, Şeyda Polat, Ş. Hakan Atapek, and Gregory N. Haidemenopoulos, Thermal and microstructural characterization of a novel ductile cast iron modified by aluminum addition, Int. J. Miner. Metall. Mater., 27(2020), No. 2, pp. 190-199. https://doi.org/10.1007/s12613-019-1876-8

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Research Article

Thermal and microstructural characterization of a novel ductile cast iron modified by aluminum addition

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Corresponding author:
Gülşah Aktaş Çelik E-mail: gulsahaktas@gmail.com
Received: 4 March 2019; Revised: 19 April 2019; Accepted: 9 May 2019; Available online: 16 December 2019

Abstract

Abstract

In high-temperature applications, like exhaust manifolds, cast irons with a ferritic matrix are mostly used. However, the increasing demand for higher-temperature applications has led manufacturers to use additional expensive materials such as stainless steels and Ni-resist austenitic ductile cast irons. Thus, in order to meet the demand while using low-cost materials, new alloys with improved high-temperature strength and oxidation resistance must be developed. In this study, thermodynamic calculations with Thermo-Calc software were applied to study a novel ductile cast iron with a composition of 3.5wt% C, 4wt% Si, 1wt% Nb, 0‒4wt% Al. The designed compositions were cast, and thermal analysis and microstructural characterization were performed to validate the calculations. The lowest critical temperature of austenite to pearlite eutectoid transformation, i.e., A₁, was calculated, and the solidification sequence was determined. Both calculations and experimental data revealed the importance of aluminum addition, as the A₁ increased by increasing the aluminum content in the alloys, indicating the possibility of utilizing the alloys at higher temperature. The experimental data validated the transformation temperature during solidification and at the solid state and confirmed the equilibrium phases at room temperature as ferrite, graphite, and MC-type carbides.
- ductile cast iron;
- alloy design;
- Thermo-Calc;
- high-temperature material

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