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Influence of mechanical surface treatments on the HCF performance of the Ni-superalloy Udimet 720 LI

  • Janny Lindemann EMAIL logo , Kim Grossmann and Lothar Wagner
Published/Copyright: February 16, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 94 Issue 6

Abstract

Shot peening was performed on smooth (geometrical notch factor kt = 1.0) and circumferentially notched (kt = 2.3 and 3.5) specimens. In addition, some notched (kt = 3.5) specimens were deep rolled. Axial fatigue tests were done at room temperature and 650 °C using a stress ratio of R = 0.1. At ambient temperature, shot peening markedly increased the high-cycle fatigue (HCF) strengths at R = 0.1 of smooth and, particularly, notched specimens with respect to the electropolished reference samples. In contrast, shot peening was found to decrease the HCF strength of smooth samples at elevated temperature (650 °C) while the HCF strength of notched specimens was slightly increased. Best elevated-temperature HCF strength of notched conditions was observed after deep rolling.

Abstract

Es erfolgten Kugelstrahlbehandlungen sowohl an glatten (geometrischer Kerbfaktor kt = 1.0) als auch an Proben mit einem umlaufenden Kerb (kt = 2.3 und 3.5). Zusätzlich zu den Kugelstrahlbehandlungen wurden auch einige gekerbte Proben (kt = 3.5) festgewalzt. Die Ermüdungsversuche wurden bei Raumtemperatur und 650 °C unter Axialbelastung bei einem Spannungsverhältnis von R = 0.1 durchgeführt. Bei RT kann durch das Kugelstrahlen die dauerfest ertragbare Maximalspannung von glatten und insbesondere gekerbten Proben im Vergleich zum elektrolytisch polierten Referenzzustand deutlich erhöht werden. Im Gegensatz dazu wird bei 650 °C die dauerfest ertragbare Maximalspannung durch das Kugelstrahlen bei glatten Proben reduziert und bei gekerbten Proben nur leicht erhöht. Die höchste Dauerschwingfestigkeit von gekerbten Proben bei erhöhter Temperatur wurde nach dem Festwalzen erreicht.

Keywords: Ni-superalloy; Fatigue strength; Shot peening; Deep rolling

Dedicated to Professor Dr. Otmar Vöhringer on the occasion of his 65th birthday

Dr.-Ing. J. Lindemann Brandenburgische Technische Universität Cottbus Lehrstuhl Metallkunde und Werkstofftechnik Universitätsplatz 3–4, D–03044 Cottbus, Germany Tel.: +49 3 55 69 28 21 Fax: +49 3 55 69 28 28

  1. Financial support by the German Federal Ministry for Education and Research (03N3067B/8) is gratefully acknowledged.

References

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[5] J. Lindemann, K. Grossmann, T. Raczek, L.Wagner, in: L. Wagner (Ed.), Influence of Shot Peening and Deep Rolling on High Temperature Fatigue of the Ni-Superalloy Udimet 720 LI, Shot Peening, Wiley-VCH, Weinheim, in press.Search in Google Scholar

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Received: 2002-10-30
Published Online: 2022-02-16

© 2003 Carl Hanser Verlag, München

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  2. Articles/Aufsätze
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  11. Deformation and fracture of Nb/α-Al2O3 composites in compression and bending studied by optical methods
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  13. Influence of mechanical surface treatments on the HCF performance of the Ni-superalloy Udimet 720 LI
  14. Precipitation of β-phase and twinning during deformation of Mg–Al alloy AZ91 at 150 °C after solution treatment
  15. Nanograin size, high-nitrogen austenitic stainless steels
  16. Der dynamische SD-Effekt und der Einfluss auf die Fließortkurve
  17. Einfluss der Umformgeschwindigkeit und -temperatur auf das Fließverhalten metallischer Werkstoffe
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  20. Strength and ductility of thin Cu wires
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  23. Determination of the local oxygen distribution in a commercial titanium alloy by 3-dimensional atom probe
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  25. Notifications/Mitteilungen
  26. Personal/Personelles
  27. Books/Bücher
  28. Conferences/Konferenzen
https://doi.org/10.1515/ijmr-2003-0122
Keywords for this article
Ni-superalloy; Fatigue strength; Shot peening; Deep rolling

Articles in the same Issue

  1. Frontmatter
  2. Articles/Aufsätze
  3. Bedeutung von Eigenspannungsabbau und mikrostrukturellen Veränderungen für die Lebensdauervorhersage schwingbeanspruchter Schweißverbindungen
  4. Factors affecting cyclic lifetime of EB-PVD thermal barrier coatings with various bond coats
  5. Depth-resolved X-ray residual stress analysis in PVD (Ti, Cr) N hard coatings
  6. Crystal orientation and residual stress in TiN film by synchrotron radiation
  7. Characterization of thermal and anodic oxide layers on β- and on near-β-titanium alloys for biomedical application
  8. Micromechanisms and modelling of crack initiation and growth in tool steels: role of primary carbides
  9. Fatigue crack nucleation at grain boundaries – experiment and simulation
  10. Fatigue and fracture-induced defect structures of metals investigated by positron microscopy
  11. Deformation and fracture of Nb/α-Al2O3 composites in compression and bending studied by optical methods
  12. Dislocation microstructures of single crystal ⟨001⟩ CMSX-4 specimens tensile tested at 700 and 1000°C
  13. Influence of mechanical surface treatments on the HCF performance of the Ni-superalloy Udimet 720 LI
  14. Precipitation of β-phase and twinning during deformation of Mg–Al alloy AZ91 at 150 °C after solution treatment
  15. Nanograin size, high-nitrogen austenitic stainless steels
  16. Der dynamische SD-Effekt und der Einfluss auf die Fließortkurve
  17. Einfluss der Umformgeschwindigkeit und -temperatur auf das Fließverhalten metallischer Werkstoffe
  18. Mean stress sensitivity of sintered iron and steel
  19. Thermozyklisches Kriechen einer kurzfaserverstärkten Aluminium-Kolbenlegierung
  20. Strength and ductility of thin Cu wires
  21. Modeling of deformation behavior of copper under equal channel angular pressing
  22. Reaktionssintern von AlMg–MgO zur Herstellung von Bauteilen auf Spinellbasis
  23. Determination of the local oxygen distribution in a commercial titanium alloy by 3-dimensional atom probe
  24. Phase diagram of the Al–Cu–Fe quasicrystal-forming alloy system
  25. Notifications/Mitteilungen
  26. Personal/Personelles
  27. Books/Bücher
  28. Conferences/Konferenzen
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