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Metallurgical and Materials Transactions A
Erschienen in: Metallurgical and Materials Transactions A 7/2009

01.07.2009

Strengthening Mechanisms in Polycrystalline Multimodal Nickel-Base Superalloys

verfasst von: R.W. Kozar, A. Suzuki, W.W. Milligan, J.J. Schirra, M.F. Savage, T.M. Pollock

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 7/2009

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Abstract

Polycrystalline γ-γ′ superalloys with varying grain sizes and unimodal, bimodal, or trimodal distributions of precipitates have been studied. To assess the contributions of specific features of the microstructure to the overall strength of the material, a model that considers solid-solution strengthening, Hall–Petch effects, precipitate shearing in the strong and weak pair-coupled modes, and dislocation bowing between precipitates has been developed and assessed. Cross-slip-induced hardening of the Ni3Al phase and precipitate size distributions in multimodal microstructures are also considered. New experimental observations on the contribution of precipitate shearing to the peak in flow stress at elevated temperatures are presented. Various alloys having comparable yield strengths were investigated and were found to derive their strength from different combinations of microconstituents (mechanisms). In all variants of the microstructure, there is a strong effect of antiphase boundary (APB) energy on strength. Materials subjected to heat treatments below the γ′ solvus temperature benefit from a strong Hall–Petch contribution, while supersolvus heat-treated materials gain the majority of their strength from their resistance to precipitate shearing.
Vorheriger Artikel Fatigue Crack Initiation Mechanism for Cast 319-T7 Aluminum Alloy
Nächster Artikel On the Influence of Alloy Composition on the Fracture Toughness of Two-Phase Ti-Al-Nb Alloys Undergoing Stress-Induced Martensitic Transformation

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Metadaten
Titel
Strengthening Mechanisms in Polycrystalline Multimodal Nickel-Base Superalloys
verfasst von
R.W. Kozar
A. Suzuki
W.W. Milligan
J.J. Schirra
M.F. Savage
T.M. Pollock
Publikationsdatum
01.07.2009
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 7/2009
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-009-9858-5

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