Abstract
“Reduced-activation” ferritic steels are being developed to replace the Cr-Mo steels presently being considered for fusion-reactor applications. To meet the reduced-activation criteria, the steels cannot contain Mo, Nb, Ni. Cu, and N. Tungsten is proposed as a substitute for molybdenum, and niobium is replaced by tantalum and an increased use of vanadium. An initial series of Cr-W steels have been produced that are analogous to the Cr-Mo steels. Microstructural examination, tempering studies, tensile tests, and Charpy impact tests indicate that three Cr-W steels with 9 to 12% Cr are comparable to the 9Cr-1MoVNb and 12Cr-1MoVW steels, which are presently the primary candidate ferritic steels for fusion applications.
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