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Registration Number

0221U101285, 0119U101186 , R & D reports

Title

Development of physicochemical fundamentals of surface engineering zirconium alloys in controlled gas environments and of methods of resource evaluation of elements of active zone

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Head

Fedirko Viktor M., Доктор технічних наук

Registration Date

18-01-2021

Organization

Karpenko Physico-Mechanical Institute of NASU

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 The kinetics of changes in the mass, hardness of the outer and inner surfaces of the ring samples cut from the fuel tube made of Zr-1%Nb alloy, which is manufactured in Ukraine, is shown. The growth kinetics of the hardened near-surface layer from the outer and inner surfaces of the ring samples by heat treatment in an oxygen- and nitrogen-containing gaseous atmospheres are analyzed. The influence of thermochemical treatment (TCT) of fuel cladding tubes in oxygen- and nitrogen-containing gaseous media with subsequent hydrogen saturation on long-term strength at room (20°С) and working (380°С) temperatures has been studied. It was found that the modification of the surface of the sample-rings from the alloy Zr-1%Nb in oxygen- and nitrogen-containing media affects their hydrogen saturation. The influence of strengthening of near-surface metal layers of sample-rings by elements of embodiment (O, N) as a result of TCT performance on their long-term strength and cyclic durability at room temperature (20°С) is shown. It is shown that the presence of dissolved in the metal samples of hydrogen with a concentration of ~ 2100 ppm at room temperature has little effect on the mechanical properties of the alloy Zr-1% Nb, and at a temperature of 380 ° C increases its ductility. Diffusion oxygen-containing layers on the zirconium alloy Zr-1% Nb prevent the dissolution of hydrogen in the metal of the samples. Nitrogen-containing diffusion layers on the zirconium alloy Zr-1% Nb even more than oxygen-containing, prevent the dissolution of hydrogen in the metal of the samples in the presence of a continuous undamaged nitride film.

Product Description

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Dzʹoba Yuriy V
Krayevsʹkyy Petro P
Luk'yanenko Oleksandr H
Trush Vasylʹ S
Fedirko . Viktor M

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2021-01-18