![]() Those samples studied from well ''B'' were taken from intervals 9471-9474 feet and 9556-9559 feet. ![]() The interval of the core samples studied from well ''A'' were 9122-9125 feet, 9140-9143 feet and 9171-9174 feet. « lessĬore samples examined from the Mission Canyon Formation, McKenzie County, North Dakota were subjected to Scanning Electron Microscopy/Energy Dispersive Spectroscopy (SEM/EDS) analysis. Furthermore, TEM allows to obtain convergent-beam electron diffraction patterns (CBED) which complement the chemical composition characterization, thereby allowing the unambiguous identification of the phases present (chemistry and crystal structure). Even though these problems are encountered in both the SEM and the TEM, the relative ease of imaging the very small inclusions in TEM confers a definite advantage to this technique. The main setbacks of using EDS for such a task more » are due to the presence of small phases of unknown thicknesses, non-homogeneity of the X-ray generation volumes, variation in absorption along the path length of the X-rays, etc. In the light of these results, we investigated the possibility of using a FEGSEM to characterize inclusions found in micro-alloyed steel welds used for arctic applications. ![]() Recent Monte Carlo simulations indicated that scanning electron electron microscopes (SEM`s) equipped with a field emission gun (FEG) might challenge transmission electron microscopes (TEM`s) for the characterization of small inclusions. These inclusions are generally too thick for EEL-spectrometry and require the use of EDS to characterize their chemical composition. ![]()
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