To understanding the control blade degradation mechanism of a boiling-water reactor (BWR), a thermodynamic database for the fuel assembly materials is a useful tool. Although the iron, boron, and carbon ternary system is a dominant phase diagram, phase relation data are not sufficient for the region in which boron and carbon compositions are richer than the eutectic composition. The phase relations of three samples such as Fe 0.68 B 0.06 C 0.26 (at%), Fe 0.68 B 0.16 C 0.16 (at%), and Fe 0.76 B 0.06 C 0.18 (at%) were analyzed by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectrometry. The results indicate that the Fe 3 (B,C) phase exists only in the intermediate region at 1273 K and that the solidus temperature widely maintains at approximately 1400 K for all three samples; these results differ from the calculated data using the previous thermodynamic database. The difference might originate from the overestimation of the interaction parameter between boron and carbon in Fe 3 (B,C). Proper titling was performed using the present data.
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