Neutron Sources at the Frank Laboratory of Neutron Physics of the Joint Institute for Nuclear Research

Швецов, В. Н.

doi:10.3390/qubs1010006

Cited by 28 publications

(11 citation statements)

References 19 publications

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“…Experiments on small-angle scattering of neutrons using time-of-flight spectrometer YuMO [7], [8] were carried out on pulse reactor IBR-2 in JINR (Dubna) [9], at the distance sample -detector 5.28 and 13.04 m, providing the range of obtained values of scattering vector Q from 0.007 to 0.5 Ǻ -1 . Diameter of irradiated area of the sample was 14 mm.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Investigation of a Mechanism of Structural Transformations in High-Strength Steel

Федосеев

Петров

Mikhaylov

et al. 2022

J. Phys.: Conf. Ser.

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Mechanical, technological and operational properties of metal materials are largely influenced by changes of concentrations, morphology, dimensions, localization, elemental and phase composition of dispersed precipitates. This paper is devoted to a study of dispersed carbides of submicron size at tempering of high-strength medium-carbon steel. The main emphasis is on comparing the data obtained by small-angle neutron scattering and transmission electron microscopy. As a result of the analysis, it was found that carbide growth begins in the investigated steel immediately after quenching when the tempering temperature increases. First, it is fixed by a transmission electron microscopy and a small-angle neutron scattering and then above ~ 300 ° C carbide growth is fixed by neutron diffraction. The residual austenite is also completely dissolved by the time the temperature reaches ~ 300 °C. A good matching has been reached for the methods used. It has been shown that a complex use of integral and local methods allows to obtain fully information about the structure and properties of the investigated material.

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Section: Materials and Experimental Methodsmentioning

confidence: 99%

Investigation of a Mechanism of Structural Transformations in High-Strength Steel

Федосеев

Петров

Mikhaylov

et al. 2022

J. Phys.: Conf. Ser.

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“…функциональном рентгеновском дифрактометре Rigaku Ultima IV с использованием программного комплекса PDXL (X-ray Powder Diffraction Software) с базой порошковых дифракционных стандартов PDF-2. Для исследований при помощи нейтронов использованы установки на импульсном реакторе ИБР-2 в ОИЯИ [9]. Для выявления мелкодисперсных карбидных составляющих стали был использован нейтронный текстурный дифрактометр СКАТ.…”

Section: материалы и методы исследованияunclassified

Multimethodological approach to the study of carbide particle dimensions in high-strength steel

Федосеев¹,

Петров²,

Islamov³

et al. 2018

LoM

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An important task in developing new materials is the study of their structure (substructure). The present study uses a number of complementary methods to determine the size, morphology, phase composition and volume fraction of dispersed precipitates in high-strength medium-carbon steel tempered in the temperature range of up to 600°C. The methods of small-angle neutron scattering, X-ray and neutron diffraction were used. Such an advantage of neutrons as the ability to use large samples, which significantly increases the maximum permissible grain size to obtain statistically reliable results and takes into account texture data, explains the use of neutron sources along with the X-ray ones. The disadvantages include a lower resolution and more complex equipment. The combined use of different techniques made it possible to determine the kinetics of structural changes in the dispersed particles during tempering of steel. The increase in tempering temperature up to 300°C results in a decrease in the amount of retained austenite. At the tempering temperature of 300°C, the growth of Fe 3 C particles instead of retained austenite starts and continues up to 600°C up to which the studies were done. The phases of retained austenite and cementite were identified by means of neutron diffraction, while changes in sizes were determined by means of small-angle neutron scattering. The results obtained do not contradict the previous transmission electron microscopy data. A comprehensive study by means of diffraction and scattering methods of X-rays and neutrons allows one to obtain exhaustive information about disperse particles in steels.

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“…The Frank Laboratory of Neuron Physics at JINR (Dubna, Russia), the basic facility of which is the IBR-2 high-flux pulsed reactor [20], has more than twenty years of experience in the development of neutron scattering methods at high pressure [17,[21][22][23]. The high-pressure cells with sapphire anvils opposite are used on a specialized neutron diffractometer DN-12 for micro-sample studies [21].…”

Section: Introductionmentioning

confidence: 99%

The DN-6 Neutron Diffractometer for High-Pressure Research at Half a Megabar Scale

et al. 2018

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A neutron diffractometer DN-6 at the IBR-2 high-flux reactor is used for the studies of crystal and magnetic structure of powder materials under high pressure in a wide temperature range. The high neutron flux on the sample due to a parabolic focusing section of a neutron guide and wide solid angle of the detector system enables neutron diffraction experiments with extraordinarily small volumes (about 0.01 mm3) of studied samples. The diffractometer is equipped with high-pressure cells with sapphire and diamond anvils, which allow pressures of up to 50 GPa to be reached. The technical design, main parameters and current capabilities of the diffractometer are described. A brief overview of recently obtained results is given.

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Neutron Sources at the Frank Laboratory of Neutron Physics of the Joint Institute for Nuclear Research

Cited by 28 publications

References 19 publications

Investigation of a Mechanism of Structural Transformations in High-Strength Steel

Investigation of a Mechanism of Structural Transformations in High-Strength Steel

Multimethodological approach to the study of carbide particle dimensions in high-strength steel

The DN-6 Neutron Diffractometer for High-Pressure Research at Half a Megabar Scale

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