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Development of Ni–Mn-based alloys for the fast epitaxial braze-repair of single-crystalline nickel-based superalloys

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Published/Copyright: June 11, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 101 Issue 5

Abstract

Diffusion brazing is a widely-used technology for the repair of cracks in hot section turbine components, mostly fabricated from nickel-based superalloys. However, the filling of wide cracks in the range of 100–300 μm is difficult since the precipitation of brittle secondary phases, which are formed by the conventionally used melting point depressants B and Si, leads to deteriorating mechanical properties. Therefore, new Ni – Mn-based braze alloys were developed which allow a very fast epitaxial healing of particularly wide cracks in single-crystalline components. As B and Si are replaced by Mn, the repair process can be significantly shortened since the epitaxial solidification is not completely controlled by diffusion but can also be controlled by cooling. Ni – Mn-based systems enhanced by Al, Cr and Ti were investigated. In this work an improved brazing cycle for the minimization of porosity within the braze gap as well as an enhanced heat treatment, which produces a γ/γ′ microstructure very similar to the parent material, are presented. Results from tensile tests at room temperature and at 900 °C conducted on 300 μm gap width samples are discussed.

Keywords: High temperature brazing; Epitaxial solidification; Nickel-based superalloys; Single-crystals
* Correspondence address, Ms. Britta Laux, Technische Universität Braunschweig, Institut für Werkstoffe, Langer Kamp 8, D-38106 Braunschweig, Germany. Tel.: +49 531 391 3069, Fax: +49 532 391 3058, E-mail:

Dedicated to Professor Dr. Monika Feller-Kniepmeier on the occasion of her 80th birthday

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Received: 2009-7-20
Accepted: 2010-1-7
Published Online: 2013-06-11
Published in Print: 2010-05-01

© 2010, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Prof. Dr. Monika Feller-Kniepmeier 80th birthday
  5. Basic
  6. Model calculation of inoculation and experimental verification in two alloy-systems
  7. Enrichment of boron at grain boundaries of platinum-based alloys determined by electron energy loss spectroscopy in a transmission electron microscope
  8. Measurement of the lattice misfit of Pt–Al–Cr superalloy by convergent beam electron diffraction (CBED)
  9. Microstructural and micromechanical characterisation of a Pt–Al–Cr–Ni–Re alloy by means of transmission electron microscopy and nanoindentation
  10. X-ray reflections from the γ/γ′-microstructure of nickel-base superalloys: effect of the plane tilting
  11. Physicochemical properties and creep strength of a single crystal of nickel-base superalloy containing rhenium and ruthenium
  12. Interdependence between glass stability and phase formation sequence during crystallization of Zr46.8Ti8.2Cu7.5Ni10Be27.5 bulk glass
  13. On the formation of λ-MnAl4
  14. Applied
  15. Development of Ni–Mn-based alloys for the fast epitaxial braze-repair of single-crystalline nickel-based superalloys
  16. Influence of heat treatment and microstructure on the tensile pseudoelastic response of an Ni-rich NiTi shape memory alloy
  17. Microstructural stability of an Ni–Mo based Hastelloy after 10 MeV electron irradiation at high temperature
  18. Oxidation behaviour of TiAl-based intermetallic coatings on γ-TiAl alloys
  19. Oxidation and fatigue behaviour of γ-TiAl coated with HIPIMS CrAlYN/CrN nanoscale multilayer coatings and EB-PVD thermal barrier coatings
  20. On the stress corrosion cracking behaviour of 6XXX series aluminium alloys
  21. Investigation of surface film nanostructure and assessment of its impact on friction force stabilization during automotive braking
  22. Creep strength of a binary Al62Ti38 alloy
  23. Bowing out of a dislocation from wall of persistent slip bands (PSB)
  24. Effect of martensite volume fraction on mechanical properties of dual-phase treated AISI-4012 sheet steels
  25. The joint properties of dissimilar aluminum plates joined by friction stir welding
  26. Notification
  27. DGM News
https://doi.org/10.3139/146.110312
Keywords for this article
High temperature brazing; Epitaxial solidification; Nickel-based superalloys; Single-crystals

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Prof. Dr. Monika Feller-Kniepmeier 80th birthday
  5. Basic
  6. Model calculation of inoculation and experimental verification in two alloy-systems
  7. Enrichment of boron at grain boundaries of platinum-based alloys determined by electron energy loss spectroscopy in a transmission electron microscope
  8. Measurement of the lattice misfit of Pt–Al–Cr superalloy by convergent beam electron diffraction (CBED)
  9. Microstructural and micromechanical characterisation of a Pt–Al–Cr–Ni–Re alloy by means of transmission electron microscopy and nanoindentation
  10. X-ray reflections from the γ/γ′-microstructure of nickel-base superalloys: effect of the plane tilting
  11. Physicochemical properties and creep strength of a single crystal of nickel-base superalloy containing rhenium and ruthenium
  12. Interdependence between glass stability and phase formation sequence during crystallization of Zr46.8Ti8.2Cu7.5Ni10Be27.5 bulk glass
  13. On the formation of λ-MnAl4
  14. Applied
  15. Development of Ni–Mn-based alloys for the fast epitaxial braze-repair of single-crystalline nickel-based superalloys
  16. Influence of heat treatment and microstructure on the tensile pseudoelastic response of an Ni-rich NiTi shape memory alloy
  17. Microstructural stability of an Ni–Mo based Hastelloy after 10 MeV electron irradiation at high temperature
  18. Oxidation behaviour of TiAl-based intermetallic coatings on γ-TiAl alloys
  19. Oxidation and fatigue behaviour of γ-TiAl coated with HIPIMS CrAlYN/CrN nanoscale multilayer coatings and EB-PVD thermal barrier coatings
  20. On the stress corrosion cracking behaviour of 6XXX series aluminium alloys
  21. Investigation of surface film nanostructure and assessment of its impact on friction force stabilization during automotive braking
  22. Creep strength of a binary Al62Ti38 alloy
  23. Bowing out of a dislocation from wall of persistent slip bands (PSB)
  24. Effect of martensite volume fraction on mechanical properties of dual-phase treated AISI-4012 sheet steels
  25. The joint properties of dissimilar aluminum plates joined by friction stir welding
  26. Notification
  27. DGM News
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