Abstract
Effects of hydrogen atmosphere on mechanical properties and surface conditions have been studied for a reduced activation ferritic steel F82H (Fe–8Cr–2W–V–Ta). Test specimens of F82H were exposed to hydrogen gas atmosphere simulating the operating conditions of a fusion reactor. Surface analyses were performed by Auger electron spectroscopy in order to evaluate the depth profiles of surface atomic compositions of F82H, and surface oxidation layers with a thickness of up to 56 nm were observed on the surface, mainly due to the high diffusion rate of oxygen in F82H matrix. A quantitative analyses of the specimens exposed to hydrogen atmosphere were performed by a gaschromatograph, and absorbed hydrogen in F82H was found negligibly small, less than 5 ppm. Tensile and Charpy impact tests were carried out on these specimens, and mechanical properties were found comparable to those of as-received materials.
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