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Influence of casting conditions on the solution treated microstructure of Ni-base superalloy

Published/Copyright: May 31, 2013
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HTM Journal of Heat Treatment and Materials
From the journal HTM Journal of Heat Treatment and Materials Volume 66 Issue 3

Abstract

Ni-base superalloy specimens were cast under different superheat levels, low and high, and various cooling rates. Solution treatment was carried out for 2 h at 1120 °C or 1180 °C then air cooled. The solution treatment at 1120 °C represents the standard solution treatment (SST) while that at 1180 °C represents the modified solution treatment (MST). DSC measurements, SEM and EDS emphasized that the α nodular and interdendritic γ/γ' phases found in as cast structure were entirely removed after solution treatment either at 1120 °C or 1180 °C. The volume fraction of η phase in microstructure of all specimens decreased with MST in comparison with SST. After SST and MST, needle like η phase had disappeared except in alloy H1 that was produced under lower cooling rate and high superheat, with SST. In addition to needle like shape, platelet η phase was found in the microstructure of H1 alloy after SST. The microstructure of other alloys contains η phase only with platelet shape. Generated metastable nano-scale γ' particles precipitated in alternating layers with η phase at the expense of transformed η phase. At the platelet η phase circumference, new γ phase with high Cr content was formed at the expense of the dissolved η phase during solution treatment.

Kurzfassung

Es wurden Proben aus einer Nickelbasis-Superlegierung durch Giesen jeweils mit niederer und hoher Uberhitzung unter unterschiedlichen Abkuhlraten hergestellt. Das Losungsgluhen erfolgte 2 h bei 1120 °C (Standard-Verfahren, SST) oder 1180 °C (modifiziertes Verfahren, MST) mit anschliesender Abkuhlung in Luft. Die Messungen mittels DSC, SEM und EDS wiesen darauf hin, dass die nach dem Giesen zu findende knollenformige α-Phase und die interdendritische γ/γ'-Phase durch das Losungsgluhen sowohl bei 1120 °C als auch bei 1180 °C vollstandig entfernt werden. Der Volumenanteil der η-Phase im Gefuge war in den mit MST gegluhten Proben geringer gegenuber solchen mit SST gegluhten. Die nadelformige η-Phase war nach SST und MST, mit Ausnahme der Legierung H1, verschwunden. Die Legierung H1 wurde mit hoher Uberhitzung unter niedriger Abkuhlrate mit SST hergestellt. Die η-Phase wurde zusatzlich zu der Nadelform in Form von Plattchen im Gefuge der Legierung H1 nach SST gefunden. Das Gefuge der anderen Legierungen enthalt die η-Phase ausschlieslich in Plattchenform. Die entstandenen, meta-stabilen Nano-γ'-Partikeln schieden sich in abwechselnden Schichten mit der η-Phase auf Kosten der umgewandelten η-Phase ab. Am auseren Umfang der η-Phase-Plattchen entstand beim Losungsgluhen die neue γ-Phase mit hohem Cr-Gehalt auf Kosten der aufgelosten η-Phase.

Keywords: Polycrystalline Ni-base superalloy; solution treatment; microstructure; η phase transformation; metastable γ' and new γ phases
Schlüsselwörter: Nitrieren; Diffusion; Abscheidung; Eigenspannung; Spannungsabbau; Modellierung

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Published Online: 2013-05-31
Published in Print: 2011-06-01

© 2011, Carl Hanser Verlag, München

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  5. Kurzfassungen/Summaries
  6. Kurzfassungen/Abstracts
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  8. Inhalt/Contents
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  10. Untersuchungen zum Plasmanitrieren von Stählen mit einem Aktivgitter*
  11. Evolution of residual stress in the diffusion zone of a model Fe-Cr-C alloy during nitriding*
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  17. Influence of casting conditions on the solution treated microstructure of Ni-base superalloy
https://doi.org/10.3139/105.110106
Keywords for this article
Polycrystalline Ni-base superalloy; solution treatment; microstructure; η phase transformation; metastable γ' and new γ phases

Articles in the same Issue

  1. Veranstaltungen/Events
  2. Veranstaltungen in Zusammenarbeit mit der AWT®
  3. HTM-Praxis
  4. HTM Praxis
  5. Kurzfassungen/Summaries
  6. Kurzfassungen/Abstracts
  7. Inhalt/Contents
  8. Inhalt/Contents
  9. Fachbeiträge/Technical Contributions
  10. Untersuchungen zum Plasmanitrieren von Stählen mit einem Aktivgitter*
  11. Evolution of residual stress in the diffusion zone of a model Fe-Cr-C alloy during nitriding*
  12. Nitrierschichten für das ultrapräzise Diamantbearbeiten von Werkzeugen der Glas- und Kunststoffabformung*
  13. Study on nitrogen in martensitic stainless steels
  14. Verzugskompensation von Wälzlagerringen durch Festwalzen
  15. Integration des Gasabschreckens in das Strangpressen von Aluminiumlegierungen – eine Machbarkeitsstudie*
  16. Ursachen und Einflussgröβen des Verzugs in der Prozesskette eines Aluminium-Druckgussbauteiles*
  17. Influence of casting conditions on the solution treated microstructure of Ni-base superalloy
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