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Moscow, Russia

Kolbasnikov N.G.,Saint Petersburg State Polytechnic University | Mishin V.V.,Saint Petersburg State Polytechnic University | Shishov I.A.,Saint Petersburg State Polytechnic University | Kistankin I.S.,Saint Petersburg State Polytechnic University | Zabrodin A.V.,JSC VNIINM
Russian Metallurgy (Metally) | Year: 2014

The critical values of the Cockcroft-Latham and Ayada criteria, which are embedded in the Deform-3D software package and can be used to describe the fracture of nanocrystalline beryllium at various stages of warm rolling, are determined. It is shown that excess over these critical values leads to the fracture of beryllium during both simulation and experimental rolling. Nondestructive conditions are developed for multipass warm rolling of beryllium with the minimum number of long-term intermediate high-temperature annealing. © 2014, Pleiades Publishing, Ltd.

Churyumov A.Y.,National University of Science and Technology "MISIS" | Khomutov M.G.,National University of Science and Technology "MISIS" | Solonin A.N.,National University of Science and Technology "MISIS" | Pozdniakov A.V.,National University of Science and Technology "MISIS" | And 2 more authors.
Materials and Design | Year: 2015

High-Cr ferritic-martensitic steels are important materials for use in nuclear reactors. This study describes a development activity for this category of steels involving the investigation of the hot deformation behaviour and microstructure evolution during hot deformation of 10CrMoWNb steel. Hot compression and tension tests were performed in the temperature range of 900-1350. °C by using a Gleeble 3800 thermomechanical simulator. The results indicate that the flow stress and ultimate tensile strength increase with a decrease of the deformation temperature and an increase of the strain rate. Based on the experimental true strain-true stress data, the modified Arrhenius-type constitutive model was established for a form of 10CrMoWNb ferritic-martensitic steel. The hot plasticity properties of the 10CrMoWNb steel increase with temperature up to 1275. °C due to dynamic recrystallisation processes in the austenite phase. The reduction of area decreases when the temperature is higher than 1300. °C and is zero at 1350. °C for all strain rates because of the liquid phase appearance in the structure of the steel. © 2015 Elsevier Ltd.

Rogozkin B.D.,JSC VNIINM | Stepennova N.M.,JSC VNIINM | Fedorov Yu.Ye.,JSC VNIINM | Shishkov M.G.,JSC VNIINM | And 5 more authors.
Journal of Nuclear Materials | Year: 2013

In the article presented are the results of post-irradiation tests of helium bonded fuel pins with mixed mononitride fuel (U0.55Pu 0.45)N and (U0.4Pu0.6)N having 85% density irradiated in BOR-60 reactor. Achieved maximum burn-up was, respectively, equal to 9.4 and 12.1 at.% with max linear heat rates 41.9 and 54.5 kW/m. Maximum irradiation dose was 43 dpa. No damage of claddings made of ChS-68 steel (20% cold worked) was observed, and ductility margin existed. Maximum depth of cladding corrosion was within 15μm. Swelling rates of (U0.4Pu 0.6)N and (U0.55Pu0.45)N were, respectively, ~1.1% and ~0.68% per 1 at.%. Gas release rate did not exceed 19.3% and 19%. Pattern of porosity distribution in the fuel influenced fuel swelling and gas release rates. © 2013 Published by Elsevier B.V.

Karasev Yu.V.,JSC VNIINM | Pantsyrny V.I.,JSC VNIINM | Polikarpova M.V.,JSC VNIINM | Lukianov P.A.,JSC VNIINM | And 4 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2013

Commercial multifilamentary NbTi strands produced by the Russian Federation Domestic Agency for the ITER poloidal field (PF) coils PF1 and PF6 were characterized regarding Jc(B, T) by magnetization and transport measurements. The results of critical current measurements at magnetic fields in the wide range from 2 to 10 T and at temperatures from 3.5 to 7.5 K are presented. The experimental results were obtained at two laboratories; the two sets of data show a good match and demonstrate the high reproducibility of data. The current sharing temperature Tcs of the strands is between 5.9 and 6 K at 6.4 T at an operating current of 33 A. These results enable finding strand characteristic parameters for Jc}(B, T) fits and lead to a database, which is essential for the future analysis of experimental data for the PF conductor performance. © 2002-2011 IEEE.

Skuratov V.A.,FLNR | Sohatsky A.S.,FLNR | O'Connell J.H.,Nelson Mandela Metropolitan University | Kornieieva K.,FLNR | And 3 more authors.
Journal of Nuclear Materials | Year: 2014

Structural changes induced by 1.2 MeV/amu xenon, krypton and argon ion irradiation in Y2Ti2O7 pyrochlore nanoparticles in EP450 ODS steel have been studied using high resolution transmission electron microscopy. It was found that diameters of amorphous latent tracks formed by Kr and Xe ions are in the range 3-7 nm when electronic stopping powers vary from 10 to 24 keV/nm. The threshold for track formation is estimated to be between 7.4 keV/nm and 9.7 keV/nm. ©2014 Elsevier Ltd. All rights reserved.

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