Персона: Клауз, Артём Вадимович
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Influence of Type and Configuration of the Atom Probe Tomography Setup with Laser Evaporation on the Data Reconstruction Accuracy
© 2021, Pleiades Publishing, Ltd.Abstract: Atom probe tomography (APT) is a tool for detailed chemical composition analysis of advanced structural material nanostructure. The use of different Atomic Probe Tomography (APT) devices requires a certification of these setups prior to conducting research. In this paper a method of comparing APT setups in order to evaluate the influence of the overall system configuration on the accuracy of obtained data is proposed. The collected data comparison is presented for the aluminum alloy Al–3.3Cu–2.5Mn–0.5Zr and structural steel 16Kh12МVSFBR gathered on the APPLE-3D (“PAZL-3D”) setup and on the new ATLAS (“ATLAZ”) unit, created through upgrading the ECOTAP. Comparison of the results confirms the feasibility of carrying out research of the same material on similar setups without significant distortion of the data under its analysis and interpretation.
Study of Nanostructures in High-Chromium Oxide Dispersion-Strengthened Steels
Comprehensive Analysis of Nanostructure of Oxide Dispersion-Strengthened Steels by Ultramicroscopy Methods
Abstract: The characterization of the nanostructure of modern oxide dispersion strengthened steels requires a comprehensive analysis using complementary techniques. In this work, the methods of small-angle X-ray scattering, transmission electron microscopy and atom probe tomography have been applied to several oxide dispersion strengthened steels. Comparison of the obtained results allows the most correct characterization of inclusion types and their number in the studied materials. It is shown that most of the studied steels contain oxide inclusions and nanosized clusters enriched in O and Y, as well as V, Ti, Al, and Zr, depending on the initial steel composition. Transmission electron microscopy and atom probe tomography provide detailed information about the inclusion types, and small-angle X-ray scattering gives the most accurate estimation of the average density of inclusions in large volumes of material. The importance of the correct determination of the inclusion types for hardening calculations is shown, the results of such calculations are compared with microhardness measurements. The calculated values of hardness for the studied steels are in the range 2.7–4.3 GPa, which is well confirmed by microhardness measurements. © 2022, Pleiades Publishing, Ltd.
Study of the Nanostructure of Oxide Dispersion-Strengthened Steels with Small-Angle Neutron Scattering
Methodology for calculating the criteria of economic efficiency of investments in nuclear icebreakers МЕТОДИКА РАСЧЕТА КРИТЕРИЕВ ЭКОНОМИЧЕСКОИ ЭФФЕКТИВНОСТИ ИНВЕСТИЦИИ В АТОМНЫЕ ЛЕДОКОЛЫ
© 2021 Obninsk Institute for Nuclear Power Engineering, National Research Nuclear University 'MEPhI'. All rights reserved.The authors propose an economic and analytical model for evaluating the criteria of efficiency (profitability) of investments in the projects of innovative nuclear icebreakers of the Northern Sea Route. The model is based on the new analytical representation of the methodology for forecasting the investment project efficiency that is widely used in international practice. The mathematical expression for the net discounted income provides convenient formulas for calculating several investment efficiency criteria for nuclear icebreakers: internal rate of return, minimum annual revenues from icebreaker convoys, discounted payback period, and the sheer volume of delivered cargo. The paper gives estimates of the criteria for the efficiency of investments in Leader class icebreakers that depend on the discount rate of cash flows, capital, and operating costs. It is shown that at such high capital costs, typical for construction of Leader class nuclear icebreakers, the minimum allowable revenue of an icebreaker is a financial burden for ships transporting cargo along the NSR, which also increases rapidly with the growth of discount rate and the reduction of investment payback period. This means that the profitability of the icebreakers is only possible at low discount rates of 2 - 3% per year, that is, at extremely low interest credit. Even with low interest and very optimistic production characteristics of the icebreaker (high speed of navigation, large number of ships in the caravan and their capacity) the payback period will exceed 25 years.