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Solidification Cracking in Manually TIG-Brazed T/C Installations of Novel AM Gas Turbine Burner Component

  • A. Neidel , T. Gädicke , S. Riesenbeck and E. Wöhl
Published/Copyright: December 5, 2019
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Practical Metallography
From the journal Practical Metallography Volume 56 Issue 12

Abstract

Serial fabrication of novel selective laser melted (SLM) heavy-duty gas turbine burner parts was established. This is an additive manufacturing (AM) process. Thermocouples (T/C) are manually tungsten inert gas (TIG) brazed to these components. After fabrication, they exhibited severe cracking within the brazed T/C joints and had to be scrapped. A laboratory order for a destructive metallographic investigation was placed by the client with the aim of determining the metallurgical cause of the cracking. The crack path is interdendritic. The crack propagated within the braze metal only. The crack morphology is consistent with solidification cracking (SC), a hot cracking mechanism. No evidence of liquid metal embrittlement, or LME, was found.

Kurzfassung

Neuartige Großgasturbinenbrennerteile wurden in Serienfertigung durch selektives Laserschmelzen hergestellt. Es handelt sich hierbei um ein additives Herstellungsverfahren. Durch manuelles WIG-Hartlöten (WIG: Wolfram-Inertgas) werden Thermoelemente mit diesen Bauteilen verbunden. Nach der Fertigung zeigte sich in den Hartlötverbindungen mit den Thermoelementen eine starke Rissbildung, sodass die Teile entsorgt werden mussten. Seitens des Kunden wurde eine zerstörende metallographische Untersuchung beim Labor in Auftrag gegeben, um die metallurgische Ursache für die Rissbildung zu ermitteln. Der Riss verläuft interdentritisch und breitete sich ausschließlich im Hartlot aus. Die Rissmorphologie entspricht der Morphologie bei einer Erstarrungsrissbildung, einem Heißrissmechanismus. Es liegen keinerlei Anzeichen für eine Flüssigmetallversprödung (Lötrissigkeit) vor.

Übersetzung: E. Engert

References / Literatur

[1] Bürgel, R.: Handbuch Hochtemperatur-Werkstofftechnik – Grundlagen, Werkstoffbeanspruchung, Hochtemperaturlegierungen. Friedr. Vieweg & Sohn Verlagsgesellschaft mbH, Braunschweig / Wiesbaden, 199810.1007/978-3-322-99904-7_6Search in Google Scholar

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Received: 2017-12-29
Accepted: 2018-01-05
Published Online: 2019-12-05
Published in Print: 2019-12-16

© 2019, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Microstructural Characterization of Molybdenum Grain Boundaries by Micropillar Compression Testing and Atom Probe Tomography
  7. Statistical 3D Analysis and Modeling of Complex Particle Systems based on Tomographic Image Data
  8. Examinations on Al-Mg-Sc-Alloys after Additive Manufacturing
  9. Solidification Cracking in Manually TIG-Brazed T/C Installations of Novel AM Gas Turbine Burner Component
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
https://doi.org/10.3139/147.110508

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Microstructural Characterization of Molybdenum Grain Boundaries by Micropillar Compression Testing and Atom Probe Tomography
  7. Statistical 3D Analysis and Modeling of Complex Particle Systems based on Tomographic Image Data
  8. Examinations on Al-Mg-Sc-Alloys after Additive Manufacturing
  9. Solidification Cracking in Manually TIG-Brazed T/C Installations of Novel AM Gas Turbine Burner Component
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
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