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  • Prompt gamma neutron activation analysis of niobium for characterization of light interstitials

    Creator:
    Love, Ian J.
    Abstract:
    High purity niobium metal is used in the construction of superconducting radio frequency (SRF) cavities in superconducting particle accelerators, such as the Large Hadron Collider (LHC) at CERN or the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory. The usual method for characterizing the impurities in this niobium, the...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ Julie D. Tucker High purity niobium metal is used in the construction of superconducting

  • The Effect of Isothermal Aging on the Development of Long-Range Order in Ni-based Alloys

    Creator:
    Aerne, Nicholas S. J.
    Abstract:
    Nickel (Ni)-based alloys with a high chromium (Cr) content are frequently employed in applications where elevated temperatures and/or corrosive environments are present due to their excellent corrosion resistance and mechanical properties. However, a gap exists around the formation, and kinetics of long-range order (LRO) Ni2Cr phase in both model binary...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________ Julie D Tucker Nickel (Ni)-based alloys with a high chromium (Cr) content are frequently

  • Acceleration of Long-Range Ordering in NiCrFe Alloys Via Proton Irradiation

    Creator:
    Evered, Cole E.
    Abstract:
    This work explores the hypothesis that proton irradiation is a feasible alternative to simulate accelerated thermal aging for Ni2Cr long-range ordered phase formation within NiCr and NiCrFe alloys. In this study, various model alloys and commercial alloys 690 and 690+P (0.01 wt.% P) were subject to 2 MeV proton irradiation...
    Resource Type:
    Masters Thesis
    Full Text:
    Irradiation Abstract approved: ______________________________________________________ Julie D

  • Role of Alloying on the Thermal Stability of Duplex Stainless Steel

    Creator:
    Garfinkel, David
    Abstract:
    Duplex stainless steels (DSS) are an attractive potential material in nuclear power generation systems due to an excellent combination of corrosion resistance, strength, toughness, and affordability. Thermal embrittlement caused by phase instability in the temperature range of ~300-550°C severely limits the service temperature of DSS. The rate of embrittlement varies...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ Julie D. Tucker Duplex stainless steels (DSS) are an attractive potential material in

  • Aqueous Corrosion and High Temperature Oxidation in Supercritical Carbon Dioxide Environments

    Creator:
    Teeter, Lucas
    Abstract:
    The corrosion resistance of steels and nickel based alloys was investigated in supercritical CO2 (sCO2). Two types of experiments were conducted. The first set of experiments were conducted in a low temperature aqueous environment to simulate conditions that would exist in direct sCO2 power cycle low temperature heat exchangers. The...
    Resource Type:
    Dissertation
    Full Text:
    : Julie D. Tucker The corrosion resistance of steels and nickel based alloys was investigated in su

  • The Processing and Microstructures of 309L Stainless Steel Clad onto Carbon Steel with Wire-fed Directed Energy Deposition

    Creator:
    Bozeman, Scott C.
    Abstract:
    Directed energy deposition and laser cladding technologies are suitable advanced manufacturing techniques for applying corrosion-resistant claddings to large carbon steel components. In this work, we clad 309L stainless steel wire onto carbon steel substrates and examine the effects of cladding parameters (laser power and travel speed) on metallurgical bonding, composition,...
    Resource Type:
    Masters Thesis
    Full Text:
    , vol. 154, no. April, pp. 49–60, 2019, doi: 10.1016/j.corsci.2019.03.027. [20] S. W. Kim, D. J. Kim

  • Characterization and Development of Ni-based Superalloys for Supercritical Carbon Dioxide Applications

    Creator:
    Adam, Benjamin M.
    Abstract:
    The advent of supercritical CO2 as a new heat-exchange medium has seen strong interest from the power industry and the energy research field recently. It is advan- tageous in comparison with other heat-exchange cycles, as it can be operated safely at much higher temperatures and pressures, thus increasing the thermal...
    Resource Type:
    Dissertation
    Full Text:
    approved: Julie D. Tucker The advent of supercritical CO2 as a new heat-exchange medium has seen strong

  • Exploring the Ductility Minimum of Niobium C103 at Intermediate Temperatures using Triaxial Tensile Specimens

    Creator:
    Wood, Thomas N., II
    Abstract:
    This work explores the mechanical properties of single-phase niobium alloy C103 from room temperature to 600°C for the purpose of expanding safe uses of the material into new applications. The study utilizes a symmetrically notched triaxial tensile specimens to manipulate the internal stress field in order to observe the changes...
    Resource Type:
    Masters Thesis
    Full Text:
    Julie D. Tucker This work explores the mechanical properties of single-phase niobium alloy C103

  • Heat Treatment Effects on the Mechanical Properties and Microstructure of CPM-M4 Tool Steel

    Creator:
    Fast, Cody P.
    Abstract:
    Variations in heat treatments have significant effects on the microstructure of tool steels. For CPM-M4 tool steel, the changes in microstructure and mechanical properties were observed based off of variations in temperature. Five heat treatments with constant exposure time and variable austenitizing and tempering temperatures were performed on samples of...
    Resource Type:
    Masters Thesis
    Full Text:
    Abstract approved: ______________________________________________________ Julie D. Tucker

  • Investigation of Thermal Degradation in Structural Alloys for Nuclear Power Systems

    Creator:
    Teng, Fei
    Abstract:
    The thermal degradation of structural materials is considered to be a key factor for evaluating the lifetime of current nuclear power plants. Ni-based and Fe-based alloys, such as 690, 625, 304, and 316, are widely used in nuclear industry as structural components due to the extraordinary corrosion resistance and mechanical...
    Resource Type:
    Dissertation
    Full Text:
    approved: ______________________________________________________ Julie D. Tucker The thermal