Central Research Institute of Structural Materials

Saint Petersburg, Russia

Central Research Institute of Structural Materials

Saint Petersburg, Russia
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Kudryavtsev A.S.,Central Research Institute of Structural Materials | Okhapkin K.A.,Central Research Institute of Structural Materials | Mikhailov M.S.,Central Research Institute of Structural Materials | Skutin V.S.,Central Research Institute of Structural Materials | And 2 more authors.
Physics of Metals and Metallography | Year: 2016

In the process of the investigation of the heat resistance of a 0.07C–12Cr–Ni–Mo–V–Nb steel of the martensitic–ferritic class, a reduction was revealed in the long-term strength of its welded joints to below the level of the strength of the base metal. To establish the causes for the accelerated failure of the welded joints, an imitation of the thermal cycles was carried out that produce the structure of the heataffected zone using a dilatometer. In the samples with the structure that corresponds to that of the heataffected zone, a local zone of softening was revealed. The investigations of the metal structure using transmission electron microscopy have shown that the reduction in the creep rupture strength was caused by structural changes under the conditions of the thermal cycle of welding upon the staying of the steel in the temperature range between the Ac1 and Ac3 points. © 2016, Pleiades Publishing, Ltd.

Ahlstrand R.,European Commission | Margolin B.,Central Research Institute of Structural Materials | Akbashev I.,EDO Gidropress | Chyrko L.,Institute for Nuclear Research of Ukraine | And 7 more authors.
Progress in Nuclear Energy | Year: 2012

The irradiation embrittlement and integrity of the VVER reactors has been an important issue in many EC supported TACIS and PHARE projects since 1990. In the EC annual programs two TACIS projects (TAREG 2.01/00 and 2.01/03) were launched on the issue in order to improve the neutron irradiation embrittlement databases, elaborate new trend curves for the embrittlement and to assess the integrity of the RPVs (Reactor Pressure Vessel) by analysing PTS transients (Pressurized Thermal Shock) for some selected Russian and Ukrainian VVER 1000 and 440/213 NPPs. In this paper the TAREG 2.01/00 project is briefly described with some details from the twin project 2.01/03, which served as a materials testing project, providing inputs for the 1st project. As a result of the project new trend curves for neutron irradiation embrittlement were elaborated, based on upgraded and more reliable surveillance results databases. The PTS study shows that the integrity of the selected VVER RPVs can be ensured to the end of RPV design life. © 2012 Elsevier Ltd. All rights reserved.

Patselov A.M.,RAS Institute of Metal Physics | Rybin V.V.,Central Research Institute of Structural Materials | Greenberg B.A.,RAS Institute of Metal Physics | Mushnikov N.V.,RAS Institute of Metal Physics
Journal of Alloys and Compounds | Year: 2010

In this article, hydrogen absorption properties of bcc single-phased as-cast Ti-Al-Nb alloys near pseudo-binary section at about 50 at.% of Ti are considered. Possible reasons of enhancing hydrogen capacity with the increasing of Nb content from ∼34 to ∼42 at.% and decreasing Al content from ∼13 to ∼6 at.% are discussed. The alloys and corresponding hydrides have been characterized by X-ray diffraction. Ti-6 at.% Al-42 at.% Nb is found to absorb maximum hydrogen H/M = 1.88 (∼2.81 wt.%) to form a hydride at 500 °C temperature and 1.2 MPa. Beneficial effect of mild cold rolling deformation on hydrogen capacity is noted. All the studied compositions demonstrate good kinetics and absorb hydrogen quickly, within 20-30 min after activation. © 2010 Elsevier B.V. All rights reserved.

Komogortsev S.,Russian Academy of Sciences | Iskhakov R.,Russian Academy of Sciences | Kuznetsov P.,Central Research Institute of Structural Materials | Belyaeva A.,Central Research Institute of Structural Materials | And 4 more authors.
Solid State Phenomena | Year: 2011

In the paper, we will present experimental results on the Fe 73.5CuNb3Si13.5B9 ferromagnetic resonance (FMR) line width as a function of annealing conditions, as well as the annealing-temperature dependence of the crystallite size, coercive force, and the magnetic anisotropy field. We shall show the interrelationship of these quantities, demonstrate that these parameters are all traceable to the nanoparticle crystallization, and indicate how they can be examined by extending the random anisotropy theory. To obtain quantitative parameters of random magnetic anisotropy we investigate the magnetization curves approaching saturation. This technique allows one to quantitatively determine the local magnetic anisotropy field (Ha) and magnetic anisotropy correlation radius (Rc), as well as to estimate the averaged magnetic anisotropy field (〈Ha〉L) and ferromagnetic correlation radius (RL).

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