Liquation Cracking in Row 3 Twin Turbine Vane Segment Caused by Malfunctioning Plasma Coating Gun

Transverse through-wall airfoil cracking was found in a row 3 twin turbine vane segment of a type used in heavy-duty gas turbine engines for power generation. A laboratory investigation determined liquation cracking (LC), a hot cracking mechanism, as the metallurgical cause of failure. As became app...

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Bibliographic Details
Published inPraktische Metallographie Vol. 60; no. 5; pp. 319 - 329
Main Authors Neidel, A., Fischer, B., Gädicke, T., Ullrich, T.
Format Journal Article
LanguageEnglish
Published De Gruyter 01.05.2023
Subjects
APS
atmospheric plasma spraying
atmosphärisches Plasmaspritzen
Feingussverfahren
Großgasturbine
heavy-duty gas turbine engine
Heißrisse
hot cracking
IN 939
investment casting
liquation cracking
nickel-base superalloy
Nickelbasis-Superlegierung
plasma coating
Plasmabeschichtung
turbine vane
Turbinenleitschaufel
Wiederaufschmelzungsrisse
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Summary:Transverse through-wall airfoil cracking was found in a row 3 twin turbine vane segment of a type used in heavy-duty gas turbine engines for power generation. A laboratory investigation determined liquation cracking (LC), a hot cracking mechanism, as the metallurgical cause of failure. As became apparent only after the investigation, the root cause of failure was a malfunctioning plasma gun used for thermal spraying the thermal barrier ceramic top coat onto the subject part.
ISSN:2195-8599
2195-8599
DOI:10.1515/pm-2023-0025