Abstract
The interactions between Fe-Cr-Mo alloys (21/4 Cr-1 Mo steel and Sandvik HT9) and static lithium were studied by means of weight changes, tensile properties, carbon concentrations in the lithium, and optical metallography. The principal result of such exposures was decarburization of 21/4 Cr-1 Mo steel by the lithium, particularly at the highest exposure temperature (600 °C). A higher chromium content (11.3 wt pct) steel, HT9, did not decarburize under similar 500 °C exposure conditions. In addition to chromium content of the steel, carbon transfer was found to depend on the exposure temperature and the steel’s initial heat treatment (the relative stability of the carbides in the steel). Exposure of 21/4 Cr-1 Mo steel to Li-5 wt pct Al caused the steel to lose its tensile ductility.
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