Abstract
Fe-(2–15)%Cr-(0–4)%W-0.1%C and Fe-9%Cr-(0–l)%V-0.1%C steels were prepared on the basis of reduced activation of ferritic steels. Tempering characteristics of these alloys were studied as a preliminary evaluation of mechanical properties. Alloys except for 12–15%Cr, 9%Cr–4%W, and 9%Cr–1%V showed a single phase of martensite. Carbides which precipitated in as-tempered steels are M 23C 6, M 6C, and W 2C for Cr-W steels and M 23C 6 and V 4C 3 for Cr-V steels. The toughness of the alloys was examined with Charpy impact test. The minimum DBTT (ductile-brittle transition temperature) was observed at around 0.25 at% of W or V concentration for 9%Cr steels. 9%Cr-V steels were superior to commercial 9%Cr–2%Mo steel in the point of toughness. The order of alloying element with a low DBTT was V > Mo > W.
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