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Microstructural Studies on Friction Surfaced Coatings of Ni-Based Alloys

  • J. Akram , R. Puli , K. Prasad Rao and M. Misra
Published/Copyright: October 6, 2015
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Practical Metallography
From the journal Practical Metallography Volume 52 Issue 10

Abstract

Inconel 625, Inconel 600, Inconel 800H were friction surfaced on steel and Inconel substrates. The interface between steel and Ni-based alloys showed intermixing of two alloys while the interface between two Ni-based alloys showed no such intermixing. The XRD results confirmed that this intermixed zone consisted of mechanical mix two separate metals and no intermetallics were noticed. Friction surfaced Inconel coatings were metallurgically bonded to steel and Inconel substrates with out any physical defects such as voids or cracks. Friction surfaced coatings showed equiaxed fine grained microstructures (4–18 µm) compared with their consumable rod counterparts (12 – 85 µm). Scanning electron microscope electron backscattered diffraction results showed that the coatings consisted of mainly high angle grain boundaries indicative of dynamic recrystallization mechanism. The temperatures recorded using Infra Red camera showed that the temperature attained at the interface between rod and the substrate is about 1100 °C. The grain size of the consumable rod was relatively fine near the coating/substrate interface and relatively coarser away from interface indicating the change in strain and temperature the rod experienced at or away from the interface.

Kurzfassung

Inconel 625, Inconel 600, Inconel 800H wurden auf Stahl und Inconel-Substraten reibgeschweißt. Die Grenzfläche zwischen Stahl und Ni-Basislegierungen zeigte eine Vermischung von zwei Legierungen, die Grenzfläche zwischen zwei Ni-Basislegierungen hingegen nicht. Die Ergebnisse der Röntgenbeugungsanalyse bestätigten, dass diese vermischte Zone aus zwei separaten, mechanisch gemischten Metallen bestand. Außerdem wurden keine intermetallischen Verbindungen gefunden. Reibgeschweißte Inconel-Beschichtungen wurden metallurgisch und ohne Defekte wie Hohlräume oder Risse mit Stahl und Inconel-Substraten verbunden. Die reibgeschweißten Beschichtungen wiesen im Vergleich zu den entsprechenden verbrauchbaren Stäben (12 – 85 µm) gleichachsige, feinkörnige Mikrostrukturen (4 – 18 µm) auf. Die Die Rückstreuelektronenbeugung (EBSD) im REM zeigte, dass die Beschichtungen hauptsächlich aus Großwinkelkorngrenzen bestanden, was auf einen dynamischen Rekristallisationsmechanismus hindeutet. Die Temperatur, die mit einer Infrarotkamera aufgezeichnet wurde, betrug an der Grenzfläche zwischen Stab und Substrat ungefähr 1100 °C. Die Korngröße des verbrauchbaren Stabs war in der Nähe der Grenzfläche zwischen Beschichtung und Substrat relativ fein, entfernt von der Grenzfläche jedoch grober. Dies deutet auf die veränderte Belastung und Temperatur hin, denen der Stab am oder abseits der Grenzfläche ausgesetzt war.

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Received: 2015-05-10
Accepted: 2015-06-29
Published Online: 2015-10-06
Published in Print: 2015-10-15

© 2015, Carl Hanser Verlag, München

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  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Preparation of and Porosity Measurements on Oxidic APS Spray Coatings
  7. Quantitative Classification and Assessment of Sr Modification in Hypoeutectic Al-Si and Al-Si-Mg Alloys
  8. Microstructural Studies on Friction Surfaced Coatings of Ni-Based Alloys
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  10. Meeting Diary/Veranstaltungskalender
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https://doi.org/10.3139/147.110355

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Preparation of and Porosity Measurements on Oxidic APS Spray Coatings
  7. Quantitative Classification and Assessment of Sr Modification in Hypoeutectic Al-Si and Al-Si-Mg Alloys
  8. Microstructural Studies on Friction Surfaced Coatings of Ni-Based Alloys
  9. Erosion Damage to Last-Stage Compressor Disk of a Heavy-duty Gas Turbine Engine
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
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