Nickel-base superalloy
AssigneePM Hochtemperatur-Metall GmbH
InventorsKlaus Zoltzer, Klaus Lempenauer, Hellmut Fischmeister
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Abstract
In section bars and shaped bodies made of nickel-base superalloys having a structure consisting of columnar grains, a complete recrystallization cannot be effected unless the heating-up rate is kept below a maximum heating-up rate T.sub.max, which depends on the ratio V of one or more of the metal carbide-forming elements hafnium, niobium, tantalum, titanium and zirconium to one or both of the metal carbide-forming elements tungsten and molybdenum.
Claims4
A nickel-base superalloy for use in making section bars and shaped bodies having a coarse structure which consists of columnar grains and has been produced by a heat treatment wherein the maximum heating-up rate T.sub.max employed until the recrystallization temperature has been reached is selected from dependence on the ratio V of one or more of the metal carbide-forming elements (MC-forming elements) hafnium, niobium, tantalum, titanium and zirconium to one or both of the metal carbide-forming elements (M.sub.23 C.sub.6) molybdenum and tungsten because the maximum heating rate T.sub.max increases as the ratio V increases, the ratio V of MC-forming elements to M.sub.23 C.sub.6 -forming elements ##EQU2##
Dependencies are inferred from the claim text.