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Papers by Yevgeniy Krainyuk

Strength of Materials, Mar 1, 2011

The test data for ring specimens from heat exchanger tubes without defects are compared to those ... more The test data for ring specimens from heat exchanger tubes without defects are compared to those for specimens with various types of defects. A relation between strength characteristics of the specimens and the nature and depth of defects has been clarified.

Materials Science, May 1, 2018

We present the results of inspection of 20-steel pipelines of nuclear power plants performed by u... more We present the results of inspection of 20-steel pipelines of nuclear power plants performed by using the nondestructive method of magnetic memory of the metals. We study the structure of the metal of pipelines after long-term operation and the defects formed in the metal. It is shown that the results of structural analysis are in good agreement with the data obtained by the nondestructive method of magnetic memory of metals. The causes and character of formation of defects in the metal of pipelines of nuclear power plants are determined.

Problems of Atomic Science and Technology, 2021

In this work, we studied the properties of samples from steel 15Cr12WNiMoV after vacuum activated... more In this work, we studied the properties of samples from steel 15Cr12WNiMoV after vacuum activated chromium plating at temperatures of 1070 and 1100 °C for 4 and 10 h. It was found that after chemical-thermal treatment on the samples a diffusion layer with a thickness of 50 to 130 µm is formed, consisting of 56…82 wt.% of chromium, the rest is iron. Metallographic studies were carried out on the samples and tests for heat resistance were carried out at a temperature of T = 900 °C. It was found that chrome-plated samples significantly exceed the initial samples and nitrided ones in terms of heat resistance. Tests of samples for tensile strength after chromium plating showed a significant increase in strength indicators for ultimate strength and yield strength. The plasticity characteristics of these samples are reduced.

Here is given the results of investigation of mechanical properties of high-purity hafnium, iodid... more Here is given the results of investigation of mechanical properties of high-purity hafnium, iodide hafnium and hafnium GFE-1 at temperature range 20-900°C. Taken results are testifying about considerable influence of methods of receiving hafnium, its purity and mechanical-thermal processing on mechanical properties. The characteristic abnormalities of mechanical properties in the temperature range 20-900°C for different purity hafnium are discussed.

Problems of Atomic Science and Technology, 2019

This study was aimed at investigating the chromium coating effect on the mechanical properties of... more This study was aimed at investigating the chromium coating effect on the mechanical properties of Zr1Nb fuel claddings in the case of a tensile fracture in longitudinal and transverse directions at temperatures of 20 and 350 °С. Tests were carried out using the samples of a similar shape, namely, with an equal test portion length that is important for comparison of results. The obtained results have shown that at a test temperature of 20 °С the mechanical properties of initial samples are higher in the longitudinal direction than in the transverse direction. The ductility is slightly higher at T = 350 °С in the longitudinal direction, and σ0.2 and σв are practically equal. The preliminary deformation of ring samples increases their ductility from 23 to 34% independently on the test temperature. Deposition of the chromium coatings on the samples leads to the slight increase of mechanical properties in the transverse direction and decrease of σ0.2 with unchanged σв and δ% in the longi...

DOAJ (DOAJ: Directory of Open Access Journals), Dec 1, 2016

There is presented results of mechanical properties testing of different type samples from TVEL t... more There is presented results of mechanical properties testing of different type samples from TVEL tubes from Zr-1%Nb alloy. Held investigations with samples tension in tube type and modified samples, shape and dimensions of that are similar with such parameters of ring samples. Held comparison of mechanical properties in longitudinal and transverse directions at standard and modified samples. Notified significant differences of mechanical properties, mostly, relative lengthening (δ%) at testing of modified samples, and also with testing of ring samples with using deformation at cone insertion, in comparison with deformation in axis direction at 2 supports. KEY WORDS: mechanical testings, TVEL-tube samples, comparison of mechanical properties in longitudinal and transverse directions

3

When determining the mechanical properties of ring specimens, a feature of a uniaxial (standard) ... more When determining the mechanical properties of ring specimens, a feature of a uniaxial (standard) loading scheme is that the method of applying a load to a specimen is somewhat remote from that to which the pipe walls can be subject in real operating conditions, in particular, these are tubes of fuel element shells. As an alternative loading method, the method of strain of an ring specimen on a cylindrical rod was considered and tested. By compressing the cylindrical rod from the ends, which in this case expanded and exerted pressure on the inner walls of the ring specimen in the radial direction, the specimen was deformed. The plasticity of fuel element shells made of Zr-1%Nb alloy on ring specimens under different loading methods is evaluated: uniaxial tension on half-disk supports, on a cylindrical rod, and on a tapered rod. Uniaxial tensile strain was determined in accordance with the normative documentation for the test method. When testing on a tapered rod, a specimen with a th...

Strength of Materials, Mar 1, 2011

The test data for ring specimens from heat exchanger tubes without defects are compared to those ... more The test data for ring specimens from heat exchanger tubes without defects are compared to those for specimens with various types of defects. A relation between strength characteristics of the specimens and the nature and depth of defects has been clarified.

Materials Science, May 1, 2018

We present the results of inspection of 20-steel pipelines of nuclear power plants performed by u... more We present the results of inspection of 20-steel pipelines of nuclear power plants performed by using the nondestructive method of magnetic memory of the metals. We study the structure of the metal of pipelines after long-term operation and the defects formed in the metal. It is shown that the results of structural analysis are in good agreement with the data obtained by the nondestructive method of magnetic memory of metals. The causes and character of formation of defects in the metal of pipelines of nuclear power plants are determined.

Problems of Atomic Science and Technology, 2021

In this work, we studied the properties of samples from steel 15Cr12WNiMoV after vacuum activated... more In this work, we studied the properties of samples from steel 15Cr12WNiMoV after vacuum activated chromium plating at temperatures of 1070 and 1100 °C for 4 and 10 h. It was found that after chemical-thermal treatment on the samples a diffusion layer with a thickness of 50 to 130 µm is formed, consisting of 56…82 wt.% of chromium, the rest is iron. Metallographic studies were carried out on the samples and tests for heat resistance were carried out at a temperature of T = 900 °C. It was found that chrome-plated samples significantly exceed the initial samples and nitrided ones in terms of heat resistance. Tests of samples for tensile strength after chromium plating showed a significant increase in strength indicators for ultimate strength and yield strength. The plasticity characteristics of these samples are reduced.

Here is given the results of investigation of mechanical properties of high-purity hafnium, iodid... more Here is given the results of investigation of mechanical properties of high-purity hafnium, iodide hafnium and hafnium GFE-1 at temperature range 20-900°C. Taken results are testifying about considerable influence of methods of receiving hafnium, its purity and mechanical-thermal processing on mechanical properties. The characteristic abnormalities of mechanical properties in the temperature range 20-900°C for different purity hafnium are discussed.

Problems of Atomic Science and Technology, 2019

This study was aimed at investigating the chromium coating effect on the mechanical properties of... more This study was aimed at investigating the chromium coating effect on the mechanical properties of Zr1Nb fuel claddings in the case of a tensile fracture in longitudinal and transverse directions at temperatures of 20 and 350 °С. Tests were carried out using the samples of a similar shape, namely, with an equal test portion length that is important for comparison of results. The obtained results have shown that at a test temperature of 20 °С the mechanical properties of initial samples are higher in the longitudinal direction than in the transverse direction. The ductility is slightly higher at T = 350 °С in the longitudinal direction, and σ0.2 and σв are practically equal. The preliminary deformation of ring samples increases their ductility from 23 to 34% independently on the test temperature. Deposition of the chromium coatings on the samples leads to the slight increase of mechanical properties in the transverse direction and decrease of σ0.2 with unchanged σв and δ% in the longi...

DOAJ (DOAJ: Directory of Open Access Journals), Dec 1, 2016

There is presented results of mechanical properties testing of different type samples from TVEL t... more There is presented results of mechanical properties testing of different type samples from TVEL tubes from Zr-1%Nb alloy. Held investigations with samples tension in tube type and modified samples, shape and dimensions of that are similar with such parameters of ring samples. Held comparison of mechanical properties in longitudinal and transverse directions at standard and modified samples. Notified significant differences of mechanical properties, mostly, relative lengthening (δ%) at testing of modified samples, and also with testing of ring samples with using deformation at cone insertion, in comparison with deformation in axis direction at 2 supports. KEY WORDS: mechanical testings, TVEL-tube samples, comparison of mechanical properties in longitudinal and transverse directions

3

When determining the mechanical properties of ring specimens, a feature of a uniaxial (standard) ... more When determining the mechanical properties of ring specimens, a feature of a uniaxial (standard) loading scheme is that the method of applying a load to a specimen is somewhat remote from that to which the pipe walls can be subject in real operating conditions, in particular, these are tubes of fuel element shells. As an alternative loading method, the method of strain of an ring specimen on a cylindrical rod was considered and tested. By compressing the cylindrical rod from the ends, which in this case expanded and exerted pressure on the inner walls of the ring specimen in the radial direction, the specimen was deformed. The plasticity of fuel element shells made of Zr-1%Nb alloy on ring specimens under different loading methods is evaluated: uniaxial tension on half-disk supports, on a cylindrical rod, and on a tapered rod. Uniaxial tensile strain was determined in accordance with the normative documentation for the test method. When testing on a tapered rod, a specimen with a th...