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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 153 for “"cooling rate"”.
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The influence of cooling rate on the microstructure of stainless steel alloys
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1988.
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Control using neural networks and adaptive control for cooling rate in GMA welding
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Gas transport properties in polycarbonate - Influence of the cooling rate, physical aging, and orientation
… films were examined as a function of the cooling rate, physical aging, and orientation. Such conditions affect the free volume content and its size and shape distribution. Results obtained from permeation experiments were accompanied with dynamic mechanical and density measurements. The …
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Effects of cooling rate and supercooling on the formation of ice in a cell population
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1983.
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Effect of cooling rate and stacking sequence on the fatigue behavior of notched quasi-isotropic APC-2 laminates
The effect of cooling rate and stacking sequence on fatigue behavior was analyzed for notched quasi-isotropic APC-2 laminates. The fatigue behavior of fast (475° F/min) and slow (1° F/min) cooled specimens of the following two layups was studied: Layup A of (-45/0/45/90), and Layup B of …
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The effect of cooling rate on toughness and crystallinity in poly(ether ketone ketone) (PEKK)/G30-500 composites
… using a hot press equipped with controlled cooling. Four of the panels were used to investigate the effect of cooling rate on crystallinity. A fifth panel was used to investigate the effect of annealing the composite after completion of the standard fabrication process. The sixth panel was …
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Characterization of the crystallinity and mechanical properties of CTFE & CTFE copolymeric films as a function of cooling rate and the implications on adhesion
… are being used as hot melt adhesives, the cooling rate is an important processing variable, affecting the crystallinity of the CTFE films which in turn affect many properties including dielectric characteristics and mechanical properties. In this study, the crystallinity of CTFE and CTFE …
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The effect of surface wettability on frost growth and densification on flat plates
… temperature, frost growth and densification rates on cold, flat surfaces subject to forced convective heat and mass transfer depend on surface wettability and cooling rate during the condensation phase. If the cooling rate is high during the condensation phase, then the droplet distribution …
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Structural heterogeneity and conformational relaxation in heme proteins
The influence of cooling rate upon the structural heterogeneity of sperm whale myoglobin solutions at cryogenic temperatures was studied. Sample cooling rates were varied by almost four orders of magnitude. FTIR spectra of the CO stretch frequency region reveal that the population of the A states …
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Rapid Solidification and Undercooling of Aluminum-Germanium Alloys: Characterization and Control of Microstructure (Metastability, Metallic Glass, Electron Microscopy)
A determination of the importances of undercooling and cooling rate in the microstructural development of Al-Ge alloys during rapid solidification has been carried out. A new technique has been developed which allows for such determinations to be performed directly in a transmission electron …
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The use of air assisted atomised water spray systems for controlled cooling of high temperature forgings
… Forgings, USA, to assist in the development of a cooling system,based on air assisted atomised water sprays primarily for the quenching of aerospace components from high temperatures.<br/>The mechanical properties of forgings used in aircraft engines depend on the rate of cooling from the heat …
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Investigation of effect of process parameters on multilayer builds by direct metal deposition
… and calculates the temperature distribution, cooling rates and re-melted layer depth, which can affect the final microstructure. Model simulations were qualitatively compared with experimental results acquired in situ using a K-type thermocouple.</p> <p>Moreover, the work focused on the effect …
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Selective Laser Melting of Finemet Soft Magnetic Material
… the formation of nanocrystals. An extremely high cooling rate is the foundational factor for controlling the microstructure. Selective Laser Melting (SLM) offers a layer thickness of 20-100 µm, naturally providing a cooling rate of 105 - 107 K/s. Subsequent melting will impact the microstructure …
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The effect of non-metallic particles on as-cast austenitic structure of low carbon steel
The effect of second-phase particles and cooling rate on the as-cast austenite grain size of peritectic plain-carbon steel has been examined. Remelting tests followed by continuous cooling and helium quenching were performed on a Gleeble 1500 Thermo mechanical Simulator. Two low alloy types of …
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Gravity Waves Studies in Mesopause Region by Using Na Wind/temperature Lidar
… horizontal wind, the mirror mounting is integrated into the lidar system, and software is written to control the mirror mounting and to communicate with the telescope computer. Eight night observations were conducted on November 1994, February 1995 and April 1995. The Starfire observations …
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Foam replicated porous 316l stainless steel based on taguchi method for biomedical applications
… sintering temperature, sintering time, heating rate and cooling rate. Scanning electron microscopy (SEM) was used to characterise the microstructure while a compression test was used to determine the mechanical properties of the samples. The physical properties including porosity and density …
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Investigation of Weldability in High-Cr Ni-base Filler Metals
… Thermocouple measurements indicated that the cooling rate during solidification in the CPTT was approximately twice that which is experienced in GTAW welding using parameters typical for use in weld overlay repairs. Finite element simulations indicated that a significant reduction in cooling …
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Hot ductility of TWIP steels
… of such factors as chemical composition, cooling rate and thermal cycle on hot ductility. Using a cooling rate of 60oC/min after heating to 1250oC, ductility was generally <40% RA (Reduction of Area) indicating that these high Al TWIP steels it will be difficult to cast without transverse …
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