Strain induced abnormal grain growth in nickel base superalloys

Nathalie Bozzolo (1) , Andrea Agnoli (1) , Nadia Souai (1) , Marc Bernacki (1) , Roland E. Logé (1)

1 CEMEF - Centre de Mise en Forme des Matériaux

Under certain circumstances abnormal grain growth occurs in Nickel base superalloys during thermomechanical forming. Second phase particles are involved in the phenomenon, since they obviously do not hinder the motion of some boundaries, but the key parameter is here the stored energy difference between adjacent grains. It induces an additional driving force for grain boundary migration that may be large enough to overcome the Zener pinning pressure. In addition, the abnormal grains have a high density of twins, which is likely due to the increased growth rate.

Mots clés: Abnormal grain growth; Strain induced grain boundary migration; Nickel base superalloys; Zener pinning

Domaines: Sciences de l'ingénieur [physics]; Matériaux

Nathalie Bozzolo, Andrea Agnoli, Nadia Souai, Marc Bernacki, Roland E. Logé. Strain induced abnormal grain growth in nickel base superalloys. 5th International Conference on Recrystallization and Grain Growth, ReX and GG, May 2013, Sydney, Australia. pp.321-324, ⟨10.4028/www.scientific.net/MSF.753.321⟩. ⟨hal-00821807⟩