Bauschinger effect in age-hardened Inconel X-750 alloy

The influence of the gamma ' -precipitates on the Bauschinger effect, in the Inconel X-750 Nickel-base superalloy, has been investigated for: solution heat treated, underaged, and overaged samples. It is found that the internal stresses increase with the aging time, providing evidence on the appearance of unshearable particles in the microstructure the results are compared with the yield stress data (del Valle, et al., Scripta Mater., 1999, 41, 237). In the overaged samples, the dependence of the internal stresses on strain behaves qualitatively in accordance with the theories of relaxed deformation in dispersion hardened metals: however, their magnitude is smaller than the predicted, producing a contribution to work hardening of about 15%. (C) 2001 Elsevier Science B.V. All rights reserved.