Metallurgical Failure Investigation of SCC in Leaking Piping System in a Combined Cycle Gas Turbine Power Plant
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A. Neidel
Abstract
Cracking and leakage, not repairable by welding, was found in premix piping of heavy-duty gas turbine engine for power plant applications. The subject laboratory specimen, a pipe section cut out on site and received at the investigating laboratory, failed by transgranular stress corrosion cracking (SCC). The stress corrosion cracking has probably been induced by chlorides (halide-induced stress corrosion cracking). Chlorine peaks were found in EDS spectra acquired on the inner pipe wall surfaces. However, it cannot completely be ruled out that those were artifacts caused by handling, cleaning, and cutting. The cracking is located adjacent to welds.
Kurzfassung
In Vormischrohrleitungen einer in einem Kraftwerk zum Einsatz kommenden Großgasturbine wurden durch Schweißarbeiten nicht reparierbare Risse und eine Leckage entdeckt. Die entsprechende Laborprobe, ein vor Ort abgetrennter und im Untersuchungslabor eingegangener Rohrabschnitt, versagte aufgrund transkristalliner Spannungsrisskorrosion (SpRK). Die Spanungsrisskorrosion ist vermutlich auf Chloride zurückzuführen (halogenidinduzierte Spannungsrisskorrosion). In von den Oberflächen der Rohrinnenwand aufgenommenen EDX-Spektren sind Chlor-Peaks auszumachen. Es kann nicht ausgeschlossen werden, dass es sich hierbei um Artefakte handelt, die von der Handhabung, dem Reinigen oder dem Trennen stammen. Die Risse bildeten sich in der Nähe von Schweißnähten.
References / Literatur
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© 2019, Carl Hanser Verlag, München
Articles in the same Issue
- Contents/Inhalt
- Contents
- Editorial
- Editorial
- Technical Contributions/Fachbeiträge
- In-Service Microstructural Modifications caused by Fatigue Phenomena leading to the Failure of a High-Voltage Cable
- Preparation Methods for Scanning Electron Microscope Characterization of Nano-Carbides in Cold Work Steel X153CrMoV12
- Development of Second-Phase Particles during Solidification and Homogenization of Aluminium Alloy AlMn1
- Metallurgical Failure Investigation of SCC in Leaking Piping System in a Combined Cycle Gas Turbine Power Plant
- Meeting Diary/Veranstaltungskalender
- Meeting Diary
Articles in the same Issue
- Contents/Inhalt
- Contents
- Editorial
- Editorial
- Technical Contributions/Fachbeiträge
- In-Service Microstructural Modifications caused by Fatigue Phenomena leading to the Failure of a High-Voltage Cable
- Preparation Methods for Scanning Electron Microscope Characterization of Nano-Carbides in Cold Work Steel X153CrMoV12
- Development of Second-Phase Particles during Solidification and Homogenization of Aluminium Alloy AlMn1
- Metallurgical Failure Investigation of SCC in Leaking Piping System in a Combined Cycle Gas Turbine Power Plant
- Meeting Diary/Veranstaltungskalender
- Meeting Diary
