Work hardening and aging contribution on the mechanical properties of X-750 nickel-based superalloy

The influence of work hardening and aging on the mechanical properties of the X-750 nickel-based superalloy was investigated. The degree of cold working by wire drawing ranges from 0% to 30% and the aging heat treatment was performed at 1005 K for 16 h. The results have shown that the yield strength is proportional to the degree of area reduction, but the increase of yield strength becomes less important after aging. The static recovery plays an important role on the final properties of the alloy, reducing the contribution of γ′ precipitates during aging. As a consequence of this recovery there is an increase of the ductility for the samples with area reduction superior to 20%. Empirical equations were proposed correlating the yield strength with the degree of cold working.