Abstract
An alloy composition of reduced-activation Cr–W–V ferritic steels for nuclear fusion reactors was studied. The formation of nano-metric precipitates through standardized heat treatments in Cr–W–V alloy system is investigated using microscopic observations. Metallography studies have revealed that the micro-structure of alloy after tempering has been Martensite. Also after tempering, the matrix structure of alloy and the formation of nano-scale precipitates on grain and lath boundaries were confirmed by the Scanning Electron Microscope observations. By the application of X-ray Diffraction spectra analysis and transmission electron microscopy (TEM) electron diffraction patterns, it was shown that the type of precipitates extracted from alloy, would be M23C6 and M7C3 that include a cubic and trigonal crystal structure, respectively. TEM analysis has revealed that the morphology of these structural components is mainly spherical and blocky shapes and the average length and thickness of them would be 65 and 50 nm, respectively.
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