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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

Head

Fedirko Viktor M., Доктор технічних наук

Registration Date

18-01-2021

Organization

Karpenko Physico-Mechanical Institute of NASU

Description

 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