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Analysis of Intergranular Impurity Concentration and the Effects on the Ductility of Copper-Shaped Charge Jets
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Shaped charge liners (SCLs) are thin-walled metallic cones that are explosively driven to high pressures and strain rates. From a metallurgical point of view, the SCLs provide an excellent experimental test bed to evaluate the influence of microstructure on high strain rate deformation and failure. In this work, a geometrical analysis based on an assumed tetrakaidecahedron grain shape is applied to determine the relationship between grain size, overall impurity content, and ductility of the liners. The measured parameter for ductility in this case is the break-up time for sulfur-doped, ...
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Grain size and its influence on materials properties.(THE HEAT TREAT DOCTOR)
; ...metallurgists, we know the importance of grain size, and as heat treaters, we need to be sure we understand how grain size will affect mechanical properties...process recipes. Let's learn more. Grain size specifics The grain size of carbon...
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Direct measurements of grain size in low-carbon steels using the laser ultrasonic technique
; ...scattering theory, absolute values of the grain size have been calculated directly from the...calibration curves between the attenuation and grain size. These results indicate that the laser...incorporated online for direct measurements of grain size during steel production. I. ...
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Using Grain Size Analysis as the Basis for a Research Project in an Undergraduate Sedimentology Course
; ...undergraduate sedimentology course using grain size analysis of sediments that combines developing...students to consider the hypothesis that the grain size distribution of sediment samples can...from beach environments, analyzing the grain size distribution of these samples and ...
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The Hall-Petch relationship.(TECH NOTES)
; ...yield stress and hardness, to observed grain size. The relationship was initially proposed...based on yield-point measurements and grain size in low-carbon steel. [[sigma].sub.y...grain boundaries, and d is the average grain size. A similar equation describes the hardness...
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Determination of Spatial Grain Size with the Area-Weighted Grain Area Distribution of the Planar Sections in Polycrystalline Materials
; ...profiles. Instead of the nominal average grain size calculated from the grain area distribution results, the spatial grain size and its distribution character reflect...the lognormally distributed spatial grain size to the area-weighted grain size distribution...
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Smaller grain size leads to better materials.(NANOTECHNOLOGY)
; ...number of materials, verifying the optimum grain size that could be used to overcome specific...dislocations, Narayan says, but reducing the grain size can theoretically restrict the movement...that this will occur at the critical grain size of about 7.5 nm. In his studies, Narayan...
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Stabilization mechanisms of retained austenite in transformation-induced plasticity steel
; ...partitioning of alloying elements, and the fine grain size-of the remaining metastable austenite...sup -3^ when the dispersed austenite grain size is down to 1 (mu)m. Whether the random...been used to study the influence of the grain size on the MS temperature. The decrease in...
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The Effect of Grain Size, Strain Rate, and Temperature on the Mechanical Behavior of Commercial Purity Aluminum
; ...UFG) microstructure with an as-received grain size of 0.35 m. This UFG material was then...were found to vary signilicantly with grain size, strain rate, and temperature. Yield stress was found to increase with decreasing grain size. decreasing temperature, and increasing...
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On the Influence of In-Situ Reactions on Grain Size during Reactive Atomization and Deposition
; ...fundamental study of the factors that govern grain size of 5083 Al processed via reactive atomization...Microstructural observation shows that the average grain size in RAD 5083 Al is slightly smaller than...during RAD process on the evolution of grain size. The numerical results ...
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Interpretation of Nanoscale Softening in Terms of Dislocation-Accommodated Boundary Sliding
; ...shows the presence of a critical grain size, d^sub c^, such that for d larger...strength increases with decreasing grain size, and for d smaller than d^sub c^, strength decreases with decreasing grain size, i.e., nanoscale softening occurs...
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