On the prediction of the yield stress of unimodal and multimodal γ′ Nickel-base superalloys

By E. Galindo-Nava, L. Connor, C. Rae. 2015

335 citations recorded by the source corpus.

Abstract A new model for the yield stress in superalloys accounting for unimodal and multimodal γ′ size distributions is presented. A critique of the classic models on γ′ shearing is presented and important features not previously considered are incorporated in our model. This is extended to account for multimodal particle size distribution effects by weighting the individual particle contribution to the total strength. This analysis is focused on powder metallurgy alloys. The yield stress and particle strengthening are predicted for eight superalloys containing wide variations in initial microstructure, composition and at temperatures up to 700 °C. We demonstrate through a theoretical approach that the strength of alloys with multimodal γ′ is lower than those with unimodal γ′ radius in the vicinity of 10–30 nm. For the first time, a parameter-free physics-based model is able to predict the yield stress in superalloys with complex microstructures, including unimodal and multimodal γ′ size. This has been possible by removing limitations inherent to the classical models. Such approach also enables critical evaluation of the relevant factors contributing to the yield strength of polycrystalline superalloys.

Subfields: Materials Chemistry, Mechanical Engineering, Mechanics of Materials

View Paper: https://www.semanticscholar.org/paper/df34fd36bbd1aec88dd2e70b463f0648e0d71cd0

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In Materials Chemistry

1. Michael Moody
2. A. Wilkinson
3. R. Reed
4. F. Dunne
5. T. Ben Britton
6. Jun Jiang

In Mechanical Engineering

1. M. Colliander
2. C. Joseph
3. A. Wilkinson
4. Christer Persson
5. R. Reed
6. F. Dunne
7. T. Ben Britton
8. Jun Jiang

In Mechanics of Materials

1. A. Wilkinson
2. F. Dunne
3. T. Ben Britton

Citations in the corpus

• Influence of heat treatment on the microstructure and tensile properties of Ni-base superalloy Haynes 282 (2017, background): “In particular, yield strength predictions received renewed attention in recent years, with a number of models for unimodal [38] and multimodal [39, 40] Ni-base superalloys being proposed.”
• On the microtwinning mechanism in a single crystal superalloy (2017, background): “But a distinction must be made between the time-dependent mode of deformation e so-called creep deformation e prevalent at high temperatures and/or low strain rates [3e5] and the timeindependent e commonly athermal e behaviour [6,7] which dominates at ambient conditions e see Fig.”