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M.c. Chaturvedi – One of the best experts on this subject based on the ideXlab platform.

A.v. Troshev – One of the best experts on this subject based on the ideXlab platform.

  • A TTT-diagram for α → β transformation of unalloyed plutonium
    Journal of Alloys and Compounds, 2007
    Co-Authors: S.i. Abramenko, Y.n. Zuyev, V.n. Kordyukov, A.m. Lyasota, B.g. Levakov, A.a. Snopkov, A.v. Troshev
    Abstract:

    Abstract The paper offers a variant of the generalized TTT-diagram (temperature–time–transition) for the α → β transformation of unalloyed plutonium under Isothermal conditions. The authors constructed it using published information on plutonium phase transformation kinetics under Isothermal conditions and α → β transformation parameters under the conditions of pulsed electric heating. The authors also present their results—parameters of the beginning of the α → β transformation in Isothermal conditions and in linear-through-volume heating by neutrons from pulsed nuclear reactors exploited at RFNC-VNIITF. Using a number of typical TTT-diagrams as examples, the authors demonstrate characteristic features in the dependence of the phase transformation incubation time on plutonium temperature in Isothermal conditions (for example, in samples hold in oil) and in electric heating conditions. They identify segments where, in the authors’ view, phase transformation conditions were not Isothermal and justify the use of the most authentic experimental data including those obtained by the authors for Isothermal conditions for the construction of the generalized TTT-diagram. To justify the use of their own results obtained for the uniform-through-volume heating of samples by neutrons, the authors used known theoretical results for non-Isothermal first-kind transition kinetics. Theoretical results suggest that for certain conditions of the first-kind transition, it is possible to relate the temperature dependences of the incubation time for non-Isothermal and Isothermal transformations. So, the authors propose a generalized TTT-diagram for a range of plutonium temperatures corresponding to the incubation times of unalloyed plutonium phase transformation between 10 −5 and 10 5  s.

  • a ttt diagram for α β transformation of unalloyed plutonium
    Journal of Alloys and Compounds, 2007
    Co-Authors: S.i. Abramenko, Y.n. Zuyev, V.n. Kordyukov, A.m. Lyasota, B.g. Levakov, A.a. Snopkov, A.v. Troshev
    Abstract:

    Abstract The paper offers a variant of the generalized TTT-diagram (temperature–time–transition) for the α → β transformation of unalloyed plutonium under Isothermal conditions. The authors constructed it using published information on plutonium phase transformation kinetics under Isothermal conditions and α → β transformation parameters under the conditions of pulsed electric heating. The authors also present their results—parameters of the beginning of the α → β transformation in Isothermal conditions and in linear-through-volume heating by neutrons from pulsed nuclear reactors exploited at RFNC-VNIITF. Using a number of typical TTT-diagrams as examples, the authors demonstrate characteristic features in the dependence of the phase transformation incubation time on plutonium temperature in Isothermal conditions (for example, in samples hold in oil) and in electric heating conditions. They identify segments where, in the authors’ view, phase transformation conditions were not Isothermal and justify the use of the most authentic experimental data including those obtained by the authors for Isothermal conditions for the construction of the generalized TTT-diagram. To justify the use of their own results obtained for the uniform-through-volume heating of samples by neutrons, the authors used known theoretical results for non-Isothermal first-kind transition kinetics. Theoretical results suggest that for certain conditions of the first-kind transition, it is possible to relate the temperature dependences of the incubation time for non-Isothermal and Isothermal transformations. So, the authors propose a generalized TTT-diagram for a range of plutonium temperatures corresponding to the incubation times of unalloyed plutonium phase transformation between 10 −5 and 10 5  s.

O. A. Idowu – One of the best experts on this subject based on the ideXlab platform.

  • effect of bonding temperature on Isothermal solidification rate during transient liquid phase bonding of inconel 738lc superalloy
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2005
    Co-Authors: O. A. Idowu, N L Richards, M.c. Chaturvedi
    Abstract:

    Abstract A commercial cast Inconel 738 superalloy was transient liquid phase (TLP) bonded using a commercial Ni–Cr–B filler alloy, Nicrobraz 150. In contrast to the solidification behavior predicted by the current TLP models, Isothermal solidification occurred under two separate regimes, depending on the bonding temperature. The rate of Isothermal solidification in the first regime was faster than in the second regime. This led to a deviation in Isothermal solidification completion time from that predicted by a conventional TLP model. The change in solidification rate was attributed to the substantial enrichment of the liquid interlayer with the base alloy solute elements and its continuous modification during Isothermal solidification. These factors were also influenced in the nature of the phases formed in the centerline eutectic constituents subsequent to the incomplete Isothermal solidification.

  • Effect of bonding temperature on Isothermal solidification rate during transient liquid phase bonding of Inconel 738LC superalloy
    Materials Science and Engineering A, 2005
    Co-Authors: O. A. Idowu, N L Richards, M.c. Chaturvedi
    Abstract:

    A commercial cast Inconel 738 superalloy was transient liquid phase (TLP) bonded using a commercial Ni-Cr-B filler alloy, Nicrobraz 150. In contrast to the solidification behavior predicted by the current TLP models, Isothermal solidification occurred under two separate regimes, depending on the bonding temperature. The rate of Isothermal solidification in the first regime was faster than in the second regime. This led to a deviation in Isothermal solidification completion time from that predicted by a conventional TLP model. The change in solidification rate was attributed to the substantial enrichment of the liquid interlayer with the base alloy solute elements and its continuous modification during Isothermal solidification. These factors were also influenced in the nature of the phases formed in the centerline eutectic constituents subsequent to the incomplete Isothermal solidification. © 2005 Elsevier B.V. All rights reserved.

S.i. Abramenko – One of the best experts on this subject based on the ideXlab platform.

  • A TTT-diagram for α → β transformation of unalloyed plutonium
    Journal of Alloys and Compounds, 2007
    Co-Authors: S.i. Abramenko, Y.n. Zuyev, V.n. Kordyukov, A.m. Lyasota, B.g. Levakov, A.a. Snopkov, A.v. Troshev
    Abstract:

    Abstract The paper offers a variant of the generalized TTT-diagram (temperature–time–transition) for the α → β transformation of unalloyed plutonium under Isothermal conditions. The authors constructed it using published information on plutonium phase transformation kinetics under Isothermal conditions and α → β transformation parameters under the conditions of pulsed electric heating. The authors also present their results—parameters of the beginning of the α → β transformation in Isothermal conditions and in linear-through-volume heating by neutrons from pulsed nuclear reactors exploited at RFNC-VNIITF. Using a number of typical TTT-diagrams as examples, the authors demonstrate characteristic features in the dependence of the phase transformation incubation time on plutonium temperature in Isothermal conditions (for example, in samples hold in oil) and in electric heating conditions. They identify segments where, in the authors’ view, phase transformation conditions were not Isothermal and justify the use of the most authentic experimental data including those obtained by the authors for Isothermal conditions for the construction of the generalized TTT-diagram. To justify the use of their own results obtained for the uniform-through-volume heating of samples by neutrons, the authors used known theoretical results for non-Isothermal first-kind transition kinetics. Theoretical results suggest that for certain conditions of the first-kind transition, it is possible to relate the temperature dependences of the incubation time for non-Isothermal and Isothermal transformations. So, the authors propose a generalized TTT-diagram for a range of plutonium temperatures corresponding to the incubation times of unalloyed plutonium phase transformation between 10 −5 and 10 5  s.

  • a ttt diagram for α β transformation of unalloyed plutonium
    Journal of Alloys and Compounds, 2007
    Co-Authors: S.i. Abramenko, Y.n. Zuyev, V.n. Kordyukov, A.m. Lyasota, B.g. Levakov, A.a. Snopkov, A.v. Troshev
    Abstract:

    Abstract The paper offers a variant of the generalized TTT-diagram (temperature–time–transition) for the α → β transformation of unalloyed plutonium under Isothermal conditions. The authors constructed it using published information on plutonium phase transformation kinetics under Isothermal conditions and α → β transformation parameters under the conditions of pulsed electric heating. The authors also present their results—parameters of the beginning of the α → β transformation in Isothermal conditions and in linear-through-volume heating by neutrons from pulsed nuclear reactors exploited at RFNC-VNIITF. Using a number of typical TTT-diagrams as examples, the authors demonstrate characteristic features in the dependence of the phase transformation incubation time on plutonium temperature in Isothermal conditions (for example, in samples hold in oil) and in electric heating conditions. They identify segments where, in the authors’ view, phase transformation conditions were not Isothermal and justify the use of the most authentic experimental data including those obtained by the authors for Isothermal conditions for the construction of the generalized TTT-diagram. To justify the use of their own results obtained for the uniform-through-volume heating of samples by neutrons, the authors used known theoretical results for non-Isothermal first-kind transition kinetics. Theoretical results suggest that for certain conditions of the first-kind transition, it is possible to relate the temperature dependences of the incubation time for non-Isothermal and Isothermal transformations. So, the authors propose a generalized TTT-diagram for a range of plutonium temperatures corresponding to the incubation times of unalloyed plutonium phase transformation between 10 −5 and 10 5  s.

J E Ruckman – One of the best experts on this subject based on the ideXlab platform.

  • Water vapour transfer in wet waterproof breathable fabrics
    Journal of Industrial Textiles, 2003
    Co-Authors: Y. J. Ren, J E Ruckman
    Abstract:

    To answer the question of whether condensation occurring on the inner surface of a waterproof breathable fabric or moisture content within such a fabric has the greater effect on water vapour transfer rate experiments were conducted using two different types of waterproof breathable fabrics under Isothermal and non-Isothermal conditions. It was found from the experimental results that moisture content and condensation have effects on water vapour transfer in both porous polyurethane and hydrophilic laminated fabrics; higher moisture content and larger amounts of condensation increase the water vapour transfer. The water vapour transfer rate of polyurethane laminated fabrics was greater under Isothermal conditions whilst the water vapour transfer rate of hydrophilic laminated fabrics was greater under non-Isothermal conditions, especially when a fabric contains more moisture in either form. It was also found that the way moisture content and condensation affect the rate of water vapour transfer is different; the effect of moisture content is greater than that of condensation on water vapour transfer under both Isothermal and non-Isothermal conditions.

  • An analysis of simultaneous heat and water vapour transfer through waterproof breathable fabrics
    Journal of Industrial Textiles, 1997
    Co-Authors: J E Ruckman
    Abstract:

    To answer the question of whether condensation occurring on the inner surface of a waterproof breathable fabric or moisture content within such a fabric has the greater effect on water vapour transfer rate experiments were conducted using two different types of waterproof breathable fabrics under Isothermal and non-Isothermal conditions. It was found from the experimental results that moisture content and condensation have effects on water vapour transfer in both porous polyurethane and hydrophilic laminated fabrics; higher moisture content and larger amounts of condensation increase the water vapour transfer. The water vapour transfer rate of polyurethane laminated fabrics was greater under Isothermal conditions whilst the water vapour transfer rate of hydrophilic laminated fabrics was greater under non-Isothermal conditions, especially when a fabric contains more moisture in either form. It was also found that the way moisture content and condensation affect the rate of water vapour transfer is different; the effect of moisture content is greater than that of condensation on water vapour transfer under both Isothermal and non-Isothermal conditions.