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Dependence of mechanical strength on grain structure in the γ′ and oxide dispersions-trengthened nickelbase superalloy PM 3030

  • Michel Nganbe , Martin Heilmaier EMAIL logo and Ludwig Schultz
Published/Copyright: January 28, 2022
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Abstract

The mechanical strength of the oxide dispersion-strengthened (ODS) nickelbase superalloy PM 3030 during deformation at constant strain rate (CSR) is discussed with special emphasis placed on its dependence on grain structure. In the fine-grain state the material shows a very high strength at low temperatures due to Hall – Petch type strengthening. However, the 0.2% offset yield strength σ0.2 falls off sharply at temperatures above 700 °C. Increase of grain size by isothermal annealing leads to a reduction of σ0.2 at low temperatures, but also to an increase of creep resistance at higher temperatures. Coarse and elongated grain structures essentially eliminate grain-boundary sliding and reduce diffusion-controlled void formation and, therefore, exhibit a superior strength level at elevated temperatures. The dependence of σ0.2 on grain structure results in a cross-over of the σ0.2 vs. T-curves within a narrow temperature range where all grain variants exhibit similar mechanical strengths. In accord with Dieter [1] this region may be called “equicohesion range” of a given material with identical chemical composition and particle structure.


Prof. Martin Heilmaier Institut für Werkstofftechnik und Werkstoffprüfung Otto-von-Guericke-Universität Magdeburg Postfach 41 20, D-39016 Magdeburg, Germany Tel.: +49 391 671 4596 Fax: +49 391 671 4569

Dedicated to Professor Wolfgang Blum on the occasion of his 65th birthday


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Received: 2005-02-15
Accepted: 2005-03-15
Published Online: 2022-01-28

© 2005 Carl Hanser Verlag, München

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