Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 15 of 15 for “"Hastelloy X"”.
-
Fabrication & Mechanical Properties of Hastelloy-X Matrix Ceramic Composite
… of sealing materials. In this thesis, porous Hastelloy-X alloy scaffolds with 80% porosity, currently used for fabricating seals in turbine applications, were used as the base material. The microstructure of the porous Hastelloy-X scaffolds was infiltrated using a room temperature curing …
-
Fatigue behavior of Hastelloy-X at elevated temperatures in air, vacuum and oxygen environments.
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Materials Science and Engineering.
-
Onset of Arizona Road Dust in High Temperature Environment on a Cooled HASTELLOY X Surface
… diagnostics. Testing was performed using HASTELLOY® X coupons and Arizona Road Dust with main gas flow temperatures between 1050°C and 1100°C. Arizona Road Dust sample with sizing between 2µm and 40µm were used for experimental testing. The sensitivity of the initial deposit formation on …
-
Experimental Investigations of the Onset of Sand Deposits on Hastelloy-X between 1000 C and 1100 C
… the deposition of Arizona Test Dust (ATD) onto Hastelloy X. The first study presented in this thesis describes a preliminary investigation of sand deposition at temperatures and velocities similar to those found in the turbine section of propulsive gas turbine engines and presents an equation …
-
Thermo-mechanical response and plastic deformation behavior of Hastelloy X at elevated temperatures — role of dynamic strain aging
In this work, the plastic behavior of Hastelloy X subjected to thermo-mechanical loading is investigated, and the phenomenon of dynamic strain aging is studied under isothermal and temperature jump experiments, using the technique of digital image correlation (DIC). The material of interest, a …
-
Quantitative understanding of the role of grain boundaries in polycrystalline deformation via multiscale digital image correlation
… plastic strain accumulation in polycrystalline Hastelloy X, a nickel-based superalloy, subjected to monotonic and cyclic loading conditions. In addition, the underlying microstructure was characterized with similar spatial resolution using electron backscatter diffraction (EBSD). The …
-
Investigation into the Hydrothermal Treatment of Sugarcane Bagasse under Near- and Supercritical Conditions
… A side by side comparison of runs conducted in a Hastelloy X bomb and a titanium bomb revealed possible wall effects. The titanium bomb run produced 13 times more CO than the Hastelloy X bomb run along with at least 60 ppm of H2S. Lower hydrocarbon yields from the former run also support the …
-
Experimental Investigation of Temperature Effects on Microparticle Sand Rebound Characteristics at Gas Turbine Representative Conditions
… materials used were stainless steel 304 and Hastelloy X. The particles impinged on the target coupon at a velocity of 28m/s. Tests were performed at three different temperatures, 300 K (ambient), 873 K, and 1073 K to simulate temperatures seen in gas turbine cooling flows. The angle of …
-
Investigation of thermal effects on fatigue crack closure using multiscale digital image correlation experiments
… the thermal effects on fatigue crack closure of Hastelloy X, a nickel-based superalloy. Using multiscale, digital image correlation (DIC), macroscale experiments were performed at 2x magnification (2 µm/pix), providing full-field crack closure measurements. Microscale experiments performed at 10x …
-
Relating fatigue crack growth to microstructure via multiscale digital image correlation
… was observed in a nickel based superalloy, Hastelloy X, at the grain level. A novel high resolution ex situ DIC technique was developed and used to measure accumulated strain fields in the plastic wake of a fatigue crack. Additionally, the evolution of the strain field as the fatigue crack …
-
Experimental Investigation of Initial Onset of Sand Deposition in the Turbine Section of Gas Turbines
… velocity of 70 m/s. The target coupon is made of Hastelloy X, a nickel-based alloy and the angle at which the particles impact the coupon varies from 30° to 80°. The experiments were performed with different amounts of total particle injected, concentration, and coupon angle to understand their …
-
Multiscale characterization of thermoacoustic response and fatigue failure of aerospace structures
… beams and plates made of a nickel super-alloy, Hastelloy X, Al 1100-O, and Al 1100-H14 were subjected to forced vibration initially at room temperature and subsequently with localized heating to examine the effects of thermal stress gradients on structural response. Coarse-grained specimens were …
-
Corrosion by molten mixtures of sodium carbonate and vanadium pentoxide
… cent sodium carbonate. Tests were also made with Hastelloy B, Hastelloy X. and 347 stainless steel. The metal specimens were coated with the slag, heated at a constant temperature in a combustion furnace for up to 36 hours, and cleaned and weighed to determine weight loss. The slag and corrosion …
-
Elevated Temperature Crack Growth in Creep and Fatigue of Metalliz Materials for High Temperature Gas-Cooled Nuclear Reactor
Made available in DSpace on 2017-07-06T18:55:21Z (GMT). No. of bitstreams: 3 Menon_Satheesh_R_MS.pdf: 63990634 bytes, checksum: 554537e3187a314f4042b5454e105d03 (MD5) Menon_Satheesh_R_MS_ABS.pdf: 851622 bytes, checksum: 32e163fe92c43b09b38949ae468dae27 (MD5) license.txt: 4813 bytes, checksum: …
-
High Temperature Corrosion Studies of Metallic Materials in High Temperature Gas-Cooled Nuclear Reactor Helium Environment
Made available in DSpace on 2017-07-06T18:55:04Z (GMT). No. of bitstreams: 3 Lee_Daniel_K_MS.pdf: 75457165 bytes, checksum: 1c352f8a0eaf27a3c60286c777a82659 (MD5) Lee_Daniel_K_MS_ABS.pdf: 628459 bytes, checksum: 9adc2363b16d312ea8d65075fd1b4b1f (MD5) license.txt: 4813 bytes, checksum: …