The Experts below are selected from a list of 69 Experts worldwide ranked by ideXlab platform
J. M. Poole - One of the best experts on this subject based on the ideXlab platform.
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Production and properties of INCOLOY{reg_sign} Alloy 908 tubing for sheathing of Nb{sub 3}Sn superconducting cables
Advances in cryogenic engineering, 1997Co-Authors: J.h. Weber, J. M. PooleAbstract:INCOLOY Alloy 908 is a controlled thermal expansion, age-Hardenable Alloy developed for Nb{sub 3}Sn cable-in-conduit sheathing applications. It has been specified for the International Thermonuclear Experimental Reactor (ITER) model superconducting magnet coils and is being considered for other similar applications. Overviews of the production sequences for several types of tubing for sheathing are presented. Supporting studies, such as hot ductility, work hardening behavior, and heat treatment responses, used to develop the production schemes are also described. Finally, example properties of the tubing are presented and discussed.
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Production and Properties of Incoloy® Alloy 908 Tubing for Sheathing of Nb3Sn Superconducting Cables
Advances in cryogenic engineering, 1996Co-Authors: J.h. Weber, J. M. PooleAbstract:INCOLOY Alloy 908 is a controlled thermal expansion, age-Hardenable Alloy developed for Nb3Sn cable-in-conduit sheathing applications. It has been specified for the International Thermonuclear Experimental Reactor (ITER) model superconducting magnet coils and is being considered for other similar applications. Overviews of the production sequences for several types of tubing for sheathing are presented. Supporting studies, such as hot ductility, work hardening behavior, and heat treatment responses, used to develop the production schemes are also described. Finally, example properties of the tubing are presented and discussed.
Fatih Üstel - One of the best experts on this subject based on the ideXlab platform.
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The Effect of Plasma Spraying on the Microstructure and Aging Kinetics of the Al-Si Matrix Alloy and Al-Si/SiC Composites
Journal of Materials Engineering and Performance, 2010Co-Authors: Yahya Altunpak, Hatem Akbulut, Fatih ÜstelAbstract:The Al-Si (LM 13)-based matrix Alloy reinforced with SiC particles containing 10, 20, and 30 vol.% SiC particles were spray-formed onto Al-Si substrates. The sprayed samples were directly subjected to a standard aging treatment (T551). From the experiments, it was observed that the high rate of solidification resulted in very fine silicon particles which were observed as continuous islands in the matrix and each island exhibited several very fine silicon crystals. Analysis showed that plasma-spraying caused an increased solid solubility of the silicon in the aluminum matrix. DSC measurements in the permanent mold-cast Al-Si matrix Alloy and plasma-sprayed Al-Si matrix Alloy showed that plasma-spraying causes an increase in the amount of GP-zone formation owing to the very high rate solidification after plasma-spraying. In the plasma-sprayed Al-Si/SiC composites GP zones were suppressed, since particle-matrix interfaces act as a sink for vacancies during quenching from high plasma process temperature. Introduction of SiC particles to the Al-Si age-Hardenable Alloy resulted in a decrease in the time required to reach plateau matrix hardness owing to acceleration of aging kinetics by ceramic SiC particles.
Seetharaman Sridhar - One of the best experts on this subject based on the ideXlab platform.
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a study of diffusion and interface controlled migration of the austenite ferrite front during austenitization of a case Hardenable Alloy steel
Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science, 2007Co-Authors: Eric Schmidt, Buddy E Damm, Seetharaman SridharAbstract:Migrating austenite/ferrite interfaces in the ferrite regions of an Alloy steel, containing 0.20 wt pct C, 0.87 wt pct Mn, and 0.57 wt pct Cr, with a ferrite/pearlite microstructure have been observed during austenitization by a high-temperature confocal scanning laser microscope in order to determine the mechanisms of transformation. The samples were subjected to isothermal (790 °C to 850 °C) and nonisothermal (0.5 °C to 20 °C/s) temperature profiles. The kinetic rates extracted from the observations were compared to models for long-range diffusion-controlled and interface reaction-controlled migration. The transition between the two mechanisms was found to occur at T 0, which defines the temperature and composition at which a partitionless phase transformation is possible. Occurrence of the partitionless, interface-controlled transformation was confirmed by an analysis of carbon distribution and microstructure before and after a sample was subjected to a particular thermal profile. The mobility of such interfaces was found to be in the range 1.6·10−13 to 2·10−12 m4·J−1·s−1, which is consistent with previous studies on interface-controlled migration of the reverse reaction, α to γ, during cooling of dilute substitutional iron Alloys. The diffusion-controlled migration, at temperatures below T 0, was found to occur in two stages: an initial stage, at which the growth rate can be predicted by a semi-infinite diffusion model; and a second stage, at which the growth slows more rapidly, possibly due to the overlap of diffusion fields.
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A Study of Diffusion- and Interface-Controlled Migration of the Austenite/Ferrite Front during Austenitization of a Case-Hardenable Alloy Steel
Metallurgical and Materials Transactions A, 2007Co-Authors: Eric D. Schmidt, E. Buddy Damm, Seetharaman SridharAbstract:Migrating austenite/ferrite interfaces in the ferrite regions of an Alloy steel, containing 0.20 wt pct C, 0.87 wt pct Mn, and 0.57 wt pct Cr, with a ferrite/pearlite microstructure have been observed during austenitization by a high-temperature confocal scanning laser microscope in order to determine the mechanisms of transformation. The samples were subjected to isothermal (790 °C to 850 °C) and nonisothermal (0.5 °C to 20 °C/s) temperature profiles. The kinetic rates extracted from the observations were compared to models for long-range diffusion-controlled and interface reaction-controlled migration. The transition between the two mechanisms was found to occur at T _0, which defines the temperature and composition at which a partitionless phase transformation is possible. Occurrence of the partitionless, interface-controlled transformation was confirmed by an analysis of carbon distribution and microstructure before and after a sample was subjected to a particular thermal profile. The mobility of such interfaces was found to be in the range 1.6·10^−13 to 2·10^−12 m^4·J^−1·s^−1, which is consistent with previous studies on interface-controlled migration of the reverse reaction, α to γ , during cooling of dilute substitutional iron Alloys. The diffusion-controlled migration, at temperatures below T _0, was found to occur in two stages: an initial stage, at which the growth rate can be predicted by a semi-infinite diffusion model; and a second stage, at which the growth slows more rapidly, possibly due to the overlap of diffusion fields.
J.h. Weber - One of the best experts on this subject based on the ideXlab platform.
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Production and properties of INCOLOY{reg_sign} Alloy 908 tubing for sheathing of Nb{sub 3}Sn superconducting cables
Advances in cryogenic engineering, 1997Co-Authors: J.h. Weber, J. M. PooleAbstract:INCOLOY Alloy 908 is a controlled thermal expansion, age-Hardenable Alloy developed for Nb{sub 3}Sn cable-in-conduit sheathing applications. It has been specified for the International Thermonuclear Experimental Reactor (ITER) model superconducting magnet coils and is being considered for other similar applications. Overviews of the production sequences for several types of tubing for sheathing are presented. Supporting studies, such as hot ductility, work hardening behavior, and heat treatment responses, used to develop the production schemes are also described. Finally, example properties of the tubing are presented and discussed.
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Production and Properties of Incoloy® Alloy 908 Tubing for Sheathing of Nb3Sn Superconducting Cables
Advances in cryogenic engineering, 1996Co-Authors: J.h. Weber, J. M. PooleAbstract:INCOLOY Alloy 908 is a controlled thermal expansion, age-Hardenable Alloy developed for Nb3Sn cable-in-conduit sheathing applications. It has been specified for the International Thermonuclear Experimental Reactor (ITER) model superconducting magnet coils and is being considered for other similar applications. Overviews of the production sequences for several types of tubing for sheathing are presented. Supporting studies, such as hot ductility, work hardening behavior, and heat treatment responses, used to develop the production schemes are also described. Finally, example properties of the tubing are presented and discussed.
Yahya Altunpak - One of the best experts on this subject based on the ideXlab platform.
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The Effect of Plasma Spraying on the Microstructure and Aging Kinetics of the Al-Si Matrix Alloy and Al-Si/SiC Composites
Journal of Materials Engineering and Performance, 2010Co-Authors: Yahya Altunpak, Hatem Akbulut, Fatih ÜstelAbstract:The Al-Si (LM 13)-based matrix Alloy reinforced with SiC particles containing 10, 20, and 30 vol.% SiC particles were spray-formed onto Al-Si substrates. The sprayed samples were directly subjected to a standard aging treatment (T551). From the experiments, it was observed that the high rate of solidification resulted in very fine silicon particles which were observed as continuous islands in the matrix and each island exhibited several very fine silicon crystals. Analysis showed that plasma-spraying caused an increased solid solubility of the silicon in the aluminum matrix. DSC measurements in the permanent mold-cast Al-Si matrix Alloy and plasma-sprayed Al-Si matrix Alloy showed that plasma-spraying causes an increase in the amount of GP-zone formation owing to the very high rate solidification after plasma-spraying. In the plasma-sprayed Al-Si/SiC composites GP zones were suppressed, since particle-matrix interfaces act as a sink for vacancies during quenching from high plasma process temperature. Introduction of SiC particles to the Al-Si age-Hardenable Alloy resulted in a decrease in the time required to reach plateau matrix hardness owing to acceleration of aging kinetics by ceramic SiC particles.
