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Metal Science and Heat Treatment

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04.12.2019 | GRAIN-BOUNDARY EMBRITTLEMENT

Grain Boundary Embrittlement of Steels of Vver-1000 Reactor Vessels Under Long-Term Operation

verfasst von: E. A. Kuleshova, D. A. Mal’tsev, S. V. Fedotova

Erschienen in: Metal Science and Heat Treatment | Ausgabe 7-8/2019

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Abstract

Results of fractographic analysis and Auger electron spectroscopy of materials of vessels of VVER-1000 reactors obtained at the “Kurchatov Institute” Research Center are systematized. Comparative analysis of the effect of the operating factors on the level of grain boundary embrittlement in the matrix metal and welded joints is performed. The contribution of grain boundary embrittlement into the total radiation-induced embrittlement of the weld metal of the vessels is determined.

Vorheriger Artikel Metal Science and Heat Treatment Volume 61, Number 8

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The AEM studies have been performed by Z. V. Bukina and M. A. Saltykov.

Here and below in the paper we give the fluences for fast neutrons (E > 0.5 MeV).

In accordance with the Langmuir–McLean theory, grain boundary segregation occurs within one monolayer, i.e., a unit closepacked layer of atoms.

Grain boundary segregation under slow cooling after the standard heat treatment is observed even in the initial condition and is responsible for the brittle intergrain fracture of the Charpy specimens.

The mechanical tests have been conducted under the guidance of D. A. Zhurko.

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Titel: Grain Boundary Embrittlement of Steels of Vver-1000 Reactor Vessels Under Long-Term Operation
verfasst von: E. A. Kuleshova
D. A. Mal’tsev
S. V. Fedotova
Publikationsdatum: 04.12.2019
Verlag: Springer US
Erschienen in: Metal Science and Heat Treatment / Ausgabe 7-8/2019
Print ISSN: 0026-0673
Elektronische ISSN: 1573-8973
DOI: https://doi.org/10.1007/s11041-019-00447-6

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