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Effect of Destabilization Heat Treatments on the Microstructure of High-Chromium Cast Iron: A Microscopy Examination Approach

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Abstract

A 18.22 wt.% Cr white iron has been subjected to various destabilization heat treatments. Destabilization at 800 °C caused gradual precipitation of M23C6 secondary carbide particles with time leading to a gradual increase in the bulk hardness. At 900, 1000, and 1100 °C, an initial sharp increase in bulk hardness with time occurred, reaching a plateau that was followed by a slightly decreasing trend. The combination of martensite formed, stoichiometry, and morphology of the secondary carbides present (mostly M7C3) are responsible for the obtained values of hardness. At 1100 °C, severe dissolution of the secondary carbides and consequent stabilization of the austenitic phase took place. Maximum hardness values were obtained for destabilization at 1000 °C. The correlation between bulk hardness and microstructural features was elaborated.

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Acknowledgments

The authors would like to acknowledge the Greek Modern Castings (GMC) S.A foundry for their kind assistance in the preparation of the examined alloy. They would also like to acknowledge, Dr. Vassilios Drakopoulos, Principal Scientist of the Institute of Chemical Engineering and High Temperature Process of the Foundation of Research, Greece and Mr. Alexander Katsoulidis, Post-graduate student of the Chemistry Department of the University of Ioannina, Greece for their assistance in the SEM examination.

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  1. Department of Materials Science and Engineering, Laboratory of Applied Metallurgy, University of Ioannina, University Campus, 45110, Ioannina, Greece

    A. E. Karantzalis, A. Lekatou & E. Diavati

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  1. A. E. Karantzalis
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  2. A. Lekatou
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  3. E. Diavati
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Correspondence to A. Lekatou.

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Karantzalis, A.E., Lekatou, A. & Diavati, E. Effect of Destabilization Heat Treatments on the Microstructure of High-Chromium Cast Iron: A Microscopy Examination Approach. J. of Materi Eng and Perform 18, 1078–1085 (2009). https://doi.org/10.1007/s11665-009-9353-6

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  • DOI: https://doi.org/10.1007/s11665-009-9353-6

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