Internal Mismatch Stresses in Nickel-Based Superalloys : A Finite Element Approach

A. Hazotte , A. Racine , S. Denis

A three-dimensional finite element (F.E.) model is used to estimate the mismatch stresses at a microscopic scale in γ-γ' single-crystal nickel-based superalloys. F.E. calculations point out the specificity of stress/strain distributions in these alloys, in particular the fact that internal stresses concentrate in the connected γ matrix. The analysis of stress/strain fields and elastic energy evolution as a function of precipitate morphology and volume fraction allows to explain some atypical precipitate shape changes such as "splitting" during precipitation treatments or "raftening" during high temperature creep tests.

Domaines: Articles anciens

A. Hazotte, A. Racine, S. Denis. Internal Mismatch Stresses in Nickel-Based Superalloys : A Finite Element Approach. Journal de Physique IV Proceedings, 1996, 06 (C1), pp.C1-119-C1-128. ⟨10.1051/jp4:1996112⟩. ⟨jpa-00254144⟩