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Showing 1 to 20 of 38 for “"dilatometry"”.
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Analysis of phase transformations in hydrogenated titanium metals by non-isothermal dilatometry
Hydrogen was used as a temporary alloying element in CP Ti and Ti-6AI-4V. The microstructural evolution and phase transformations were monitored, before, during and after hydrogenation with in-situ dilatometric testing. Wrought CP Ti and Ti-6AI-4V specimens were pre-annealed and experienced four …
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The influence of substitutional elements on the transformability of 3CR12 steel
… the decomposition of austenite to ferrite using dilatometry, and by investigating the partition of alloying elements between delta ferrite and austenite at I 000°C using the electron microprobe. The effects of the alloying elements on the kinetics of the transformation were investigated by VF A …
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Microstructure and properties of laser beam and gas tungsten arc welded zirconium-2.5niobium
… gas tungsten arc welding (GTAW), were applied. Dilatometry was performed on cooling from 1050°C at varying cooling rates ranging between 0.5-600°C/s. In addition, tensile and micro-Vickers hardness tests were done to characterize the mechanical properties. Microstructural examination of the …
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Investigation of the Lanthanide Sesquioxides as High Temperature Transformation Toughening Agents
… grinding, cooling in liquid nitrogen, DTA, dilatometry, ambient and high temperature Vickers indentation, and notched-beam three point flexure.
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Mechanism of anisotropic shrinkage during sintering of metalli powders
… a prior cold compacted iron was investigated by dilatometry. Shrinkage is larger along the compaction direction than in the compaction plane. This phenomenon is very pronounced during the heating ramp in alpha phase and in particular below the Curie temperature, while in austenitic field is quite …
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Materials Processing Towards Development of Rapid Prototyping Technology for Manufacturing Biomedical Implants
… for beta to hydroxy-oxyapatite transformation. Dilatometry revealed that dimensional change reaches to saturation at 1200°C. Mechanical testing of the parts sintered at 1200--1500°C revealed that compressive strength in the 2--10 MPa range was achieved.
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Role of impurities, LiF, and processing on the sintering, microstructure, and optical properties of transparent polycrystalline magnesium aluminate (MgAl2O4) spinel, The
… likely responsible for counteracting absorption. Dilatometry was conducted to study the effect of processing variables, and for the first time of neutron irradiation of starting powders, on the sintering behavior of cold-pressed powder compacts. Green-body density, stoichiometry, and impurities …
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Grain Boundary Solute Segregation in Vanadium
… bulk parts for engineering applications, and dilatometry experiments reveal that that the addition of strongly segregating solutes also dramatically suppresses the sintering behavior. A kinetic analysis of the dilatometry data suggests that rapid grain boundary diffusion pathways that are …
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Effects of vanadium microalloying of 1080 steel on pearlite transformation kinetics and microstructural development
… V addition, were isothermally heat treated using dilatometry to assess pearlite transformation rates. A detailed microstructural analysis, utilizing field emission scanning electron microscopy, was performed to measure pearlite ILS and colony size. Grain boundary cementite formation and morphology …
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Corrosion resistance of modified β-Eucryptite
… The corrosion resistance was characterized by dilatometry, scanning electron microscopy, X-ray diffraction, energy dispersive x-ray analysis, weight variations, and mechanical properties variations. The results show that modified β-eucryptite is more severely corroded than commercial …
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Quenching and partitioning of plate steel: development of design methodologies
… were experimentally validated through dilatometry simulations of plate Q&P processing, according to numerically simulated profiles. An 18 mm plate of a 0.4 wt pct C-1.5 wt pct Si alloy (300M), severe water quenched and partitioned during air cooling and furnace reheating, was simulated …
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The effect of copper on the eutectoid transformation in ductile iron
… from 0 to 0.8 wt. % were investigated. Gleeble dilatometry was used to characterize phase transformations and microstructure development. The diffusion coefficient of carbon in ferrite in the presence of copper and silicon was measured using multicomponent solid-solid diffusion experiments. …
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Ruthenium complexes as potential aqueous romp catalysts
… to a trans-placement of the phosphine ligands. Dilatometry was investigated as a technique for the acquisition of kinetic data from aqueous metathesis reactions. For the attempted polymerisation of 7-oxanorbonenedicarboxylic acid the results are explained in terms of a reverse Diels-Alder …
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Radiation Effects on Thermal Properties of Advanced Nuclear Materials
… via laser flash analysis, high-resolution dilatometry, and differential scanning calorimetry. Comparative analysis revealed that even low-fluence neutron irradiation induced complex defect clusters that degraded thermal diffusivity, while the crystallographic lattice parameters, vibrational …
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The influence of the thermomechanical processing on the annealing response of 3CR12 steel
… tests, tensile tests and impact energy tests, dilatometry, differential thermal analysis and volume fraction analysis. Alloys in the as-rolled state exhibited an increase in martensite content related to an increase in the cooling rate following hot rolling. The increase in martensite content …
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Shape Memory Alloy / Glass Composite Seal for Solid Oxide Fuel Cells
… has been observed through X-ray diffraction and dilatometry. The CTE decreases from 9.3Ã 10-6/°C to 6.6Ã 10-6/°C after thermal cycling. Neutron diffraction data from TiNiHf /glass composite samples reveals that the TiNiHf alloy has the ability of absorbing residual stresses from a glass matrix …
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Cryogenic Shape Memory Alloy Actuators For Spaceport Technologies: Materials Characterization And Prototype Testing
… processing, subsequent characterization using dilatometry and differential scanning calorimetry and implementation in the conduction switch configuration are addressed. This work was funded by grants from NASA KSC (NAG10-323) and NASA GRC (NAG3-2751).
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Commissioning Of An Arc-melting/vacuum Quench Furnace Facility For Fabrication Of Ni-ti-fe Shape Memory Alloys, And The Characterization
… Differential scanning calorimetry (DSC) and a dilatometry setup was used to characterize the fabricated materials and determine relationships between composition, thermo-mechanical processing parameters and transformation temperatures.
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Living cationic polymerization
… tetrabutylammonium chloride have been studied. Dilatometry studies at 25 °C were conducted and the orders of reaction were established. Molecular weight studies were conducted for these experiments using size exclusion chromatography. These studies indicated that transfer/termination reactions …
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Characterization of Cure Kinetics and Physical Properties of a High Performance, Glass Fiber-Reinforced Epoxy Prepreg and a Novel Fluorine-Modified, Amine-Cured Commercial Epoxy.
… the linear expansion of the piston on a quartz dilatometry cell using TMA. The shrinkage of prepregs was determined to depend on the curing temperature, pressure applied and the fiber orientation. Chemical modification of an epoxy was done by mixing a fluorinated aromatic amine (aniline) with a …
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