The effect of molybdenum on the interaction of uranium-molybdenum alloys with iron and corrosion-resistant steel
https://doi.org/10.26583/vestnik.2025.4.1
EDN: DPPXQO
Abstract
The paper presents the results of studying the interaction of uranium-molybdenum alloys with corrosion-resistant steels in non-reactor diffusion experiments at temperatures of 700-850°C. A solid-phase interaction is observed in the U10Mo/Fe13Cr diffusion pair at an annealing temperature of 700°C. An increase in the annealing temperature above the eutectic transformation in the U-Fe system leads to a change in the diffusion pattern from bulk to grain boundary. The appearance of a liquid phase is observed, which crystallized into eutectic upon cooling. The growth rate of the interaction layer for diffusion pairs is described by a parabolic law. The results of the study of the effect of the molybdenum content in the uranium alloy on the kinetics of the growth of the interaction with Fe-Cr showed that the alloying of uranium with molybdenum up to 17 wt.% leads to a linear decrease in the growth rate of the entire interaction layer (Ktot) with corrosion-resistant steels, and the growth rate constant of the interaction layer in steel (Kp) decreases exponentially with an increase in the molybdenum content at a temperature of 750 °C, due to a decrease in the mutual diffusion coefficient in the U-Mo system with an increase in the molybdenum content. Kp decreases by 10 times, Ktot decreases by 30 times at a temperature of 750 ° C with an increase in the Mo content from 6 to 17 wt.%. Based on the results of the study of the structural and phase state of the interaction layer between uranium alloys and steels of various compositions, triple diagrams of the states of alloys of the following systems U-Mo-Fe, U-Mo-Fe(Cr), at temperatures of 750°C.
About the Authors
S. N. Nikitin
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)
Russian Federation
Russian Federation
B. A. Tarasov
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)
Russian Federation
Russian Federation
D. P. Shornikov
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)
Russian Federation
Russian Federation
A. S. Yurlova
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)
Russian Federation
Russian Federation
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For citations:
Nikitin S.N., Tarasov B.A., Shornikov D.P., Yurlova A.S. The effect of molybdenum on the interaction of uranium-molybdenum alloys with iron and corrosion-resistant steel. Vestnik natsional'nogo issledovatel'skogo yadernogo universiteta "MIFI". 2025;14(4):279-290. (In Russ.) https://doi.org/10.26583/vestnik.2025.4.1. EDN: DPPXQO
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