Peculiarities of Radiation-Induced Processes in the Cr-Ni-Mo Austenitic Steels Studied by Neutron Diffraction

V. I. Voronin; V. L. Arbuzov; V. I. Bobrovskii; S. E. Danilov; K. A. Kozlov; N. V. Proskurnina; V. V. Sagaradze

doi:10.17804/2410-9908.2015.5.080-089

V. I. Voronin, V. L. Arbuzov, V. I. Bobrovskii, S. E. Danilov, K. A. Kozlov, N. V. Proskurnina, V. V. Sagaradze

PECULIARITIES OF RADIATION-INDUCED PROCESSES IN THE Cr-Ni-Mo AUSTENITIC STEELS STUDIED BY NEUTRON DIFFRACTION

DOI: 10.17804/2410-9908.2015.5.080-089

Understanding the mechanisms of radiation-induced phenomena in FCC-materials is of fundamental significance for the development of new austenitic reactor steels. An important role in these phenomena, along with the crystal structure and chemical composition of the matrix, belongs to doping elements and the microstructure of the material. In this paper, peculiarities of competing processes that proceed under fast neutron irradiation in Cr-Ni-Mo steels doped with Ti are studied by means of neutron diffraction. It is demonstrated that, on the one hand, new Ni3Ti g¢-phase particles are formed and, on the other hand, they dissolve to form interstitial Ti atoms. Besides, there is radiation-induced relaxation of microscopic stresses, which, in the case of large neutron fluences, overlaps with additional microstresses resulting from the accumulation of radiation-induced defects. The observed effects agree with the results we obtained for other austenitic steels.

Keywords: austenitic reactor steels, radiation damages, defects, radiation-induced processes, doping, neutron diffraction

References:

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$Fig. 1. A neutron diffraction pattern of a Kh16N15M3T1 steel sample at room temperature: experimental data (dots), calculation (blue envelope line) and the curve of the difference between experiment and calculation (lower green line)$

$Fig. 5. Neutron diffraction patterns of a hardened Kh16N15M3T1 steel sample before (blue circles) and after (red triangles) radiation$

В. И. Воронин, В. Л. Арбузов, В. И. Бобровский, С. Е. Данилов, К. А. Козлов, Н. В. Проскурнина, В. В. Сагарадзе

НЕЙТРОННО-ДИФРАКЦИОННЫЕ ИССЛЕДОВАНИЯ ОСОБЕННОСТЕЙ РАДИАЦИОННО-ИНДУЦИРОВАННЫХ ПРОЦЕССОВ В ХРОМ-НИКЕЛЬ-МОЛИБДЕНОВЫХ АУСТЕНИТНЫХ РЕАКТОРНЫХ СТАЛЯХ

Понимание механизмов радиационно-индуцированных явлений в ГЦК материалах имеет фундаментальное значение для разработки новых аустенитных реакторных сталей. В этих явлениях помимо кристаллической структуры и химического состава матрицы важнейшую роль играют легирующие примеси и микроструктурное состояние материалов. В работе средствами нейтронографии вскрыты особенности конкурентных процессов, протекающих при облучении быстрыми нейтронами в легированных титаном хром-никель-молибденовых сталях. Показано, что, с одной стороны, происходит образование новых частиц g¢-фазы Ni3Ti, а с другой – идет их растворение с образованием междоузельных атомов титана. Также протекают процессы радиационно-стимулированной релаксации микронапряжений, перекрывающиеся в случае больших нейтронных флюенсов возникновением дополнительных микронапряжений вследствие накопления радиационных дефектов. Наблюдавшиеся эффекты согласуются с результатами, полученными авторами для других аустенитных сталей.

Ключевые слова: аустенитные реакторные стали, радиационно-индуцированные процессы, легирование, нейтронная ди-фракция

Библиография:

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Evolution of the Microstructure and Microstresses in the 40Kh4G18F2 Steel upon Carbide Aging / V. V. Sagaradze, B. N. Goshchitskii, E. G. Volkova, V. I. Voronin, I. F. Berger, and I. Uvarov // Physics of Metals and Metallogragraphy. – 2011. – Vol. 111, iss. 1. – P. 80–90. – DOI: 10.1134/S0031918X1101011X.
Evolution of the microstructure and microdistortions in the austenitic Cr-Ni-Ti steel during aging / V. V. Sagaradze, V. I. Voronin, I. F. Berger, E. G. Volkova, B. N. Goshchitskii // Physics of Metals and Metallogragraphy. – 2011. – Vol. 12, iss. 5. – P. 517–525. – DOI: 10.1134/S0031918X11050279.
Precipitation hardening and radiation damageability of austenitic stainless steels / V. V. Sagaradze, V. M. Nalesnik, S. S. Lapin, V. M. Aliabev // Journal of Nuclear Materials. – 1993. – Vol. 202, iss. 1–2. – P.137–144. – DOI: 10.1016/0022-3115(93)90036-X.
Krivoglaz M. A. X-ray and Neutron Diffraction in Nonideal Crystals. – Berlin, Heidelberg: Springer Verlag Publ., 1996. – 466 p.
Rodriguez-Carvajal J. Recent advances in magnetic structure determination by neutron powder diffraction // Physica B: Condensed Matter. – 1993. – Vol.192, iss. 1–2. – P. 55–69. – DOI: 10.1016/0921-4526(93)90108-I.
Ungar T., Borbely A. The effect of dislocation contrast on x-ray line broadening: a new approach to line profile analysis // Appl. Phys. Lett. – 1996. – Vol. 69, iss. 21. – P. 3173–3175. – DOI: 10.1063/1.117951.
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Neutron diffraction and electron microscopic investigation of decomposition and radiation induced ageing of Cr-Ni-Ti austenitic alloys / V. M. Alab’yev, V. G. Vologin, S. F. Dubinin, S. S. Lapin, V. D. Parkhomenko, V. V. Sagaradze // Physics of Metals and Metallography. – 1990. – Vol. 70, iss. 2. – P. 131–137.

Библиографическая ссылка на статью

Peculiarities of Radiation-Induced Processes in the Cr-Ni-Mo Austenitic Steels Studied by Neutron Diffraction / V. I. Voronin, V. L. Arbuzov, V. I. Bobrovskii, S. E. Danilov, K. A. Kozlov, N. V. Proskurnina, V. V. Sagaradze // Diagnostics, Resource and Mechanics of materials and structures. - 2015. - Iss. 5. - P. 80-89. -
DOI: 10.17804/2410-9908.2015.5.080-089. -
URL: http://dream-journal.org/issues/2015-5/2015-5_46.html
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