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  1. No Access

    Article

    Kinetics of Austenitic Nitriding and Properties of Ni – Co – Cr – W – Ti Alloy

    The kinetics of high-temperature nitriding and changes in the structure and properties of heat-resistant Ni – Co – Cr – W – Ti nickel alloy VZh171 depending on its duration were studied. Short-term pulling and...

    M. V. Akhmedzyanov, S. V. Ovsepyan, A. O. Rodin… in Metal Science and Heat Treatment (2022)

  2. No Access

    Article

    Investigation of the Nitride Phase in a Heat-Resistant VZh171 Alloy of the Ni–Co–Cr–W–Ti System, Hardened by Internal Nitriding

    By means of the X-ray microspectral analysis and scanning and transmission electron microscopy, we investigate the composition of hardening phase particles—nitrides—after internal nitriding and subsequent heat...

    S. V. Ovsepyan, Yu. R. Kolobov, M. V. Akhmedzyanov… in Inorganic Materials: Applied Research (2022)

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    Article

    Features of Deformation of High-Alloy Heat-Resistant Nickel Alloys near the Complete Dissolution Temperature of the Strengthening γ' Phase

    The features of deformation of high-alloy heat-resistant nickel alloys for disks of gas turbine engines of the Ni–Co–Cr–W–Al–Nb–Ti–Mo system (EP962, EK151, and EP975 type) have been studied near the temperatur...

    S. V. Ovsepyan, B. S. Lomberg, M. N. Letnikov… in Inorganic Materials: Applied Research (2021)

  4. No Access

    Article

    Investigation of the Influence of Thermomechanical Treatment on the Structural-Phase State and Mechanical Properties of a VZh171 Alloy

    An analysis of the influence of thermomechanical treatment (TMT) (rolling to a strain degree of 50%, annealing at a temperatures of 600–1200°C, 1 h) on the microstructure and phase composition of a VZh171 allo...

    S. A. Bozhko, Yu. R. Kolobov, S. S. Manokhin, S. V. Ovsepyan… in Russian Physics Journal (2020)

  5. No Access

    Article

    Development of Ni-Base Superalloy with Operating Temperature up to 800°C for Gas Turbine Disks

    Abstract—The results of development of new nickel-base superalloy having an operating temperature up to 800°C for gas turbine disks have been presented. Structures, mechanical properties, and phase transformation...

    M. M. Bakradze, S. V. Ovsepyan, A. A. Buiakina… in Inorganic Materials: Applied Research (2018)

  6. No Access

    Article

    Growth kinetics of particles of nitrides in process of high-temperature volume nitriding of wrought alloy of Ni-Co-Cr-W-Ti system

    The laws of nitride phase formation are studied for the Ni-Co-Cr-W-Ti new class heat-resistant alloy, strengthened by volume nitriding. The data on kinetic features of behavior of the alloy during thermochemic...

    S. V. Ovsepyan, B. S. Bokstein, M. V. Akhmedzyanov… in Inorganic Materials: Applied Research (2015)

  7. No Access

    Article

    Heat-Resistant Wrought Weldable Alloy for GTE Components with Low Linear Thermal Expansion Coefficient

    Features of the effect of alloying elements on linear thermal expansion coefficient of wrought heat-resistant alloys based on the Ni–Fe system are studied. Short-term and long-term strength at 600°C is simulat...

    S. V. Ovsepyan, B. S. Lomberg, T. I. Grigor’eva, M. M. Bakradze in Metallurgist (2013)

  8. No Access

    Article

    Involvement of GABAB Receptors in Presynaptic Inhibition of Fibers of the Descending Projections of the Spinal Cord in the Frog Rana Ridibunda

    Isolated spinal cord preparations from Rana Ridibunda frogs were used for studies of the effects of the GABAB receptor agonists (–)-baclofen (50 and 100 μM) and GABA (4–8 mM) and the specific GABAB receptor antag...

    S. V. Ovsepyan, N. P. Veselkin in Neuroscience and Behavioral Physiology (2003)

  9. No Access

    Article

    A Study of the Role of GABAA- and GABAB-Receptors in Presynaptic Inhibition of Primary Afferents in the Spinal Cord of the Frog Rana ridibunda

    The role of GABAA- and GABAB-receptors in presynaptic inhibition of primary afferent fibers was studied on an isolated preparation of the spinal cord of the frog Rana ridibunda. It is shown that the inhibitory ef...

    S. V. Ovsepyan, N. P. Vesselkin in Journal of Evolutionary Biochemistry and Physiology (2002)

  10. No Access

    Article

    Effects of Serotonin on Primary Afferents in the Frog Spinal Cord

    We studied, on isolated preparations of the frog spinal cord, the effects of serotonin in different concentrations on the amplitude-temporal parameters of action potentials (AP) in primary afferent fibers, on ...

    S. V. Ovsepyan, N. P. Vesselkin in Neurophysiology (2001)

  11. No Access

    Article

    Calculation of the high-temperature strength of complexly alloyed nickel alloys using equations of the system of nonpolarized ionic radii

    Modern complexly alloyed high-temperature nickel-base alloys contain up to 14 alloying elements. The complex composition ensures fulfillment of strict and often contradictory requirements imposed on the materi...

    S. V. Ovsepyan, B. S. Lomberg, E. V. Baburina in Metal Science and Heat Treatment (1995)