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Influence of the γ́ Phase on the Creep Behavior of a New Polycrystalline Nickel-Based Superalloy (AD 730)

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Published/Copyright: November 29, 2017
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Practical Metallography
From the journal Practical Metallography Volume 54 Issue 12

Abstract

Demands for cost-efficiency and a flexible use of gas turbines are constantly increasing, creating a call for new alloys which allow achieving better efficiencies. Today's limit of use of common polycrystalline wrought alloys is 650 °C, whereas the new γ / γ́ wrought alloy AD 730 is designed for use at 700 °C. The presented work examines and discusses the impact of the microstructure on the alloy's creep behavior. Supersolvus and subsolvus solution annealing was performed to provide for a coarse-grained and fine-grained microstructure which was subsequently aged at different aging times.

Kurzfassung

Die Ansprüche an die Wirtschaftlichkeit und den flexiblen Einsatz von Gasturbinen steigen stetig. So sind neue Legierungen gefordert, mit denen ein höherer Wirkungsgrad erreicht werden kann. Die Einsatzgrenze der gängigen polykristallinen Knetlegierungen liegt heute bei ca. 650 °C. Die neue γ / γ́-Knetlegierung AD 730 dagegen ist für den Einsatz bei 700 °C ausgelegt. In dem hier vorgestellten Beitrag wird der Einfluss der Mikrostruktur auf das Kriechverhalten der Legierung untersucht und diskutiert. Durch Super- und Sub-Solvus-Lösungsglühungen erfolgte die Einstellung eines grob- und eines feinkörnigen Gefüge, das anschließend unterschiedlich lange ausgelagert wurde.

Translation: E. Engert

References / Literatur

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Received: 2017-06-21
Accepted: 2017-10-28
Published Online: 2017-11-29
Published in Print: 2017-12-15

© 2017, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Volume Fraction Determination of Discretely Oriented Disc-Shaped Precipitates in Transmission Mode
  7. Influence of the γ́ Phase on the Creep Behavior of a New Polycrystalline Nickel-Based Superalloy (AD 730)
  8. Fracture of a Leaf Chain for Lifting Clamps
  9. Conference Proceedings of the 51st Metallography Conference, September 13th to 15th in Aalen
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
https://doi.org/10.3139/147.110473

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Volume Fraction Determination of Discretely Oriented Disc-Shaped Precipitates in Transmission Mode
  7. Influence of the γ́ Phase on the Creep Behavior of a New Polycrystalline Nickel-Based Superalloy (AD 730)
  8. Fracture of a Leaf Chain for Lifting Clamps
  9. Conference Proceedings of the 51st Metallography Conference, September 13th to 15th in Aalen
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
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