Embrittlement of Fuel Gas Piping Made of Wrought Nickel-Based Superalloy Due to Inadequate Heat Treatment
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A. Neidel
Abstract
Cold-drawn and cold-bent seamless Alloy 617 pipes were received by a gas turbine engine manufacturer for final assembly. They exhibited multiple cracking on the surface. The extrados of bending zones were most affected by this condition. It was determined that the metallurgical root cause of the problem was inadequate heat treatment by the supplier of the semi-finished product. The cracking upon cold bending the seamless pipes was caused by embrittlement of the pipes’ surface due to nitridation and a further drop in formability as a result of grin boundary embrittlement by secondary carbide precipitates.
Kurzfassung
Ein Gasturbinenhersteller erhielt nahtlos kaltgezogene und kaltgebogene Rohre aus der Legierung 617 zwecks Endmontage. Die Oberfläche wies mehrere Risse auf. Die Krümmungsaußenseiten (Extrados) der Biegezonen waren davon am meisten betroffen. Es wurde ermittelt, dass die metallurgische Grundursache des Problems eine unsachgemäß durchgeführte Wärmebehandlung seitens des Anbieters des Halbzeugs war. Die Rissbildung beim Kaltbiegen der nahtlosen Rohre wurde durch Versprödung der Rohroberfläche aufgrund von Nitriden und einer weiteren Abnahme der Umformbarkeit als Ergebnis einer Korngrenzenversprödung durch sekundär ausgeschiedene Carbide verursacht.
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© 2013, Carl Hanser Verlag, München
Artikel in diesem Heft
- Contents/Inhalt
- Contents
- Editorial
- Editorial
- Technical Contributions/Fachbeiträge
- Microstructure Evolution and Mechanical Properties Investigation of Al-6 %Cu Alloy Laser and GTA Welds
- Preparation and Microstructural Characterisation of Metal Injection Moulded Powder Metallurgical Components (MIM) in the Green and Sintered Conditions
- Quantitative Analysis of Microstructure in Low Carbon Steel after Thermomechanical Process in (α+γ) Region
- Embrittlement of Fuel Gas Piping Made of Wrought Nickel-Based Superalloy Due to Inadequate Heat Treatment
- Meeting Diary/Veranstaltungskalender
- Meeting Diary
Artikel in diesem Heft
- Contents/Inhalt
- Contents
- Editorial
- Editorial
- Technical Contributions/Fachbeiträge
- Microstructure Evolution and Mechanical Properties Investigation of Al-6 %Cu Alloy Laser and GTA Welds
- Preparation and Microstructural Characterisation of Metal Injection Moulded Powder Metallurgical Components (MIM) in the Green and Sintered Conditions
- Quantitative Analysis of Microstructure in Low Carbon Steel after Thermomechanical Process in (α+γ) Region
- Embrittlement of Fuel Gas Piping Made of Wrought Nickel-Based Superalloy Due to Inadequate Heat Treatment
- Meeting Diary/Veranstaltungskalender
- Meeting Diary
