| 摘要 |
Process for the production of longitudinally-directed coarse-grained columnar crystals in an oxide-dispersion-hardened nickel-based superalloy which is difficult to recrystallize, starting from a warm-kneaded fine-grained structural status, by heating to a preheating temperature Tpre, which is below the minimum recrystallization temperature Trec min necessary for the material and is at least at the solution annealing temperature of the carbides in the gamma -matrix, keeping at Tpre for 5 min to 6 h, for the purpose of isothermal annealing, and immediately heating to recrystallization temperature Trec at 10 DEG to 40 DEG C./min without prior cooling, and cooling to room temperature.
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