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High Temperature Oxidation and Decarburization of SiMo Cast Iron in Air and Combustion Atmospheres

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Abstract

Silicon and molybdenum (SiMo) alloyed cast irons with spherical graphite are used for exhaust manifolds for service at high temperatures in air and combustion atmospheres containing water vapor. Analysis of degraded surfaces of in-service manifolds indicates existence of a combined oxidation and de-carburization (de-C) phenomena. Therefore, sequential high-temperature tests in air and combustion atmosphere with recording weight change together with carbon analysis at each time step were utilized to quantify the kinetics of both processes. The recorded weight change was related to weight gain due to oxidation and weight loss due to de-C. Carbon analysis was used to de-couple these two processes. SEM measured thicknesses of de-C layers were used to verify kinetics obtained from changes in carbon concentration during oxidation. It was shown that the oxidation and de-C kinetics have different sensitivities to testing temperature and the type of oxidizing atmospheres. At 700 °C and above, there are several significant mutual effects between scale formation and de-C processes which affect the kinetics of these processes and activation energy. The tested experimental methodology for decoupling these processes can be used for alloy optimization.

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Acknowledgements

This material is based upon work supported by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE) under the Award No. DE-EE0008458. Experimental tests were supported by the Peaslee Steel Research Manufacturing Center at Missouri S&T.

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Authors and Affiliations

  1. Missouri University of Science and Technology, Rolla, MO, 65409, USA

    Simon N. Lekakh, Asebi Bofah, Richard Osei & Ron O’Malley

  2. Research and Innovation Center, Ford Motor Company, Dearborn, MI, 48124, USA

    Larry Godlewski & Mei Li

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  1. Simon N. Lekakh
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  2. Asebi Bofah
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  4. Ron O’Malley
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Correspondence to Simon N. Lekakh.

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Lekakh, S.N., Bofah, A., Osei, R. et al. High Temperature Oxidation and Decarburization of SiMo Cast Iron in Air and Combustion Atmospheres. Oxid Met 95, 251–268 (2021). https://doi.org/10.1007/s11085-021-10022-1

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  • DOI: https://doi.org/10.1007/s11085-021-10022-1

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