Process for producing a fine-grained workpiece from a nickel-bas

Details Process for producing a fine-grained workpiece from a nickel-bas Process for producing a fine-grained workpiece from a nickel-bas

1984-09-28

1986-09-16

Dean, R.

Metal treatment

Compositions

Heat treating

C22F 110

Patent

active

046120629

ABSTRACT:
A fine-grained workpiece having improved mechanical properties is produced from a nickel-based superalloy by two-part forging, a blank being converted, in a first isothermal hot-forming step (curve b) above the solution-annealing temperature for the .gamma.'-phase (line a), into an intermediate form and the latter then being finally forged to give the end form in a second isothermal hot-forming step (curve c) just below the solution-annealing temperature for the .gamma.'-phase. For the first step, a degree of deformation .epsilon. of of at least 0.7 at a mean deformation rate .epsilon. of about 10.times.10.sup.-3 s.sup.-1 is required here. The second step is carried out at deformation rates .epsilon. which are one to two powers of 10 lower than those of the first step.

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