P. Yasniy (Author), V.B. Hlado (Author), V. Hutsaylyuk (Author), Tomaž Vuherer (Author)

Abstract

This paper presents the results of investigation of a nuclear reactor pressurevessel steel 15Kh2MFA of two strength levels under cyclic loading. Themechanism of microcrack formation on the surface and in the bulk of 15Kh2MFA steel under cyclic deformation was investigated. Analysis of the specimen surfaces has shown that microcracks are caused by cyclic sliding in grains most favourably oriented with respect to the direction of the maximum shear stresses. Transmission electron microscope investigations show that microcracks in the material inside the grains are formed mainly along the band-type dislocation structure parallel to the dislocation subboundary. During cyclic deformation, the dislocation density on the subboundaries increases, in the local areas the dislocation density becomes limiting and it reaches the plasticity limit and causes microcrack formation. The interrelation of the average length of microcracks and their surface density with the energy density of inelastic deformation has been found.

Keywords

preizkušanje materialov;jedrski reaktor;tlačna posoda;ciklično obremenjevanje;ciklične deformacije;struktura dislokacije;utrujenostna razpoka;rast razpoke;lomna mehanika;material testing;nuclear reactor;pressure vessel;cyclic loading;cyclic deformation;dislocation structure;fatigue crack growth;TEM;fracture mechanics;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FS - Faculty of Mechanical Engineering
UDC: 621.1:539.42
COBISS: 9527574 Link will open in a new window
ISSN: 8756-758X
Views: 1381
Downloads: 35
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Other data

Secondary language: English
Secondary keywords: preizkušanje materialov;jedrski reaktor;tlačna posoda;ciklično obremenjevanje;ciklične deformacije;struktura dislokacije;utrujenostna razpoka;rast razpoke;lomna mehanika;
URN: URN:SI:UM:
Pages: str. 391-397
Volume: ǂVol. ǂ28
Issue: ǂiss. ǂ4
Chronology: Apr. 2005
ID: 8718288