Effect of cerium addition on microstructures of carbon-alloyed iron aluminides |
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Authors: | S Sriram R Balasubramaniam M N Mungole S Bharagava R G Baligidad |
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Affiliation: | (1) Department of Materials and Metallurgical Engineering, Indian Institute of Technology, 208 016 Kanpur, India;(2) Defence Metallurgical Research Laboratory, 500 058 Hyderabad, India |
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Abstract: | The effect of Ce addition on the microstructure of carbon-alloyed Fe3Al-based intermetallic has been studied. Three different alloys of composition, Fe-18.5Al-3.6C, Fe-20.0Al-20C and Fe-19.2Al-3.3C-0.07Ce
(in at%), were prepared by electroslag remelting process. Their microstructures were characterized using optical and scanning
electron microscopies. Stereological methods were utilized to understand the observed microstructures. All the alloys exhibited
a typical two-phase microstructure consisting of Fe3AlC carbides in an iron aluminide matrix. In the alloy without Ce addition, large bulky carbides were equally distributed
throughout the matrix with many smaller precipitates interspersed in between. In the alloy with Ce addition, the carbide grain
sizes were finer and uniformly distributed throughout the matrix. The effect of Ce addition on the carbide morphology has
been explained based on the known effect of Ce in modifying carbide morphology in cast irons. |
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Keywords: | Iron aluminide Fe 3Al Ce addition microstructure stereology |
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