High Cycle Fatigue Failure of a Turbocharger Wheel
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A. Neidel
Boromir Fischer completed a training as State Certified Technical Assistant for Metallography and Physical Material Analysis at Lette-Verein in Berlin. He has worked in the metallographic laboratory of the Siemens Gas Turbine Plant (Siemens-Gasturbinenwerk) Berlin for more than a decade. The key areas of his work are failure analysis and microstructural examinations using the field emission scanning electron microscope.Tobias Gädicke was born in 1986 and joined the Siemens Energy Sector in 2005 as apprentice in the Berlin Gas Turbine Works. As materials testing technician, his main field of expertise is metallographic target preparation of laser-drilled holes in turbine blading. Also, he is expert in the field of portable metallography by means of the replica technique with both putty and replica foils which he regularly applies to microstructural analyses of large gas turbine casings made of ductile iron and steel castings. He is a lecturer in the DGM seminar on portable metallography. Metallurgical failure analysis of gas turbine engine hot gas path components are another field of expertise of his.
Abstract
A metallographic section from the crack area of an exhaust gas turbocharger was supplied by the customer. The shaft made of quenched and tempered low-alloy steel and the charger wheel made of a nickel-based superalloy were joined by laser welding. For design reasons, the root side of the weld contained a geometric notch, at which a high cycle fatigue crack initiated during the test facility operation of the turbocharger. At the time of examination, it went through almost the entire weld root. As a corrective action, it was recommended that the welded joint be replaced by a shrink fit.
Kurzfassung
Vom Auftraggeber wurde eine Schliffprobe aus dem Rissbereich eines Abgasturboladerrades übergeben. Die Welle aus einem niedriglegierten Vergütungsstahl war mittels Laserschweißen mit dem Laderrad aus einer Nickelbasis-Superlegierung verbunden worden. Konstruktionsbedingt befand sich auf der Wurzelseite der Schweißnaht eine geometrische Kerbe, an der während des Prüffeld-Betriebes des Turboladers ein hochzyklischer Ermüdungsriss eingeleitet wurde, der zum Untersuchungszeitpunkt fast die gesamte Schweißnahtwurzel durchlaufen hatte. Als Abhilfemaßnahme wurde empfohlen, die Schweißverbindung durch einen Schrumpfsitz zu ersetzen.
About the authors
Boromir Fischer completed a training as State Certified Technical Assistant for Metallography and Physical Material Analysis at Lette-Verein in Berlin. He has worked in the metallographic laboratory of the Siemens Gas Turbine Plant (Siemens-Gasturbinenwerk) Berlin for more than a decade. The key areas of his work are failure analysis and microstructural examinations using the field emission scanning electron microscope.
Tobias Gädicke was born in 1986 and joined the Siemens Energy Sector in 2005 as apprentice in the Berlin Gas Turbine Works. As materials testing technician, his main field of expertise is metallographic target preparation of laser-drilled holes in turbine blading. Also, he is expert in the field of portable metallography by means of the replica technique with both putty and replica foils which he regularly applies to microstructural analyses of large gas turbine casings made of ductile iron and steel castings. He is a lecturer in the DGM seminar on portable metallography. Metallurgical failure analysis of gas turbine engine hot gas path components are another field of expertise of his.
References / Literatur
[1] Neidel, A.; Gädicke, T.; Fischer, B.: Interner Bericht GT BLN MOS Q/2011/0909, Berlin, 16.11.2011Search in Google Scholar
[2] AMS 5391. Aerospace Material SpecificationSearch in Google Scholar
[3] https://www.nickelinstitute.org/media/2487/alloys-713c_337.pdf accessed May 1, 2020Search in Google Scholar
[4] Pratt and Whitney Aircraft Company, Materials Engineering SectionSearch in Google Scholar
[5] Union Carbide Stellite Company: Thermal and Electrical Conductivity of Haynes Alloy No. 713C, Technical Services ReportSearch in Google Scholar
[6] Haynes Alloy No. 713C, Data Sheet F-30; 154A, March 1960Search in Google Scholar
[7] Cers, A. E.; Blatherwick, A. A.: Fatigue and Stress-Rupture Properties of Inconel 713C, V-57C and Titanium Alloys 7A1 – 3Mo – Ti and MST 821 (8A1 – 2Cb – 1Ta –Ti ), WADD Technical Report 60-426, July 1960Search in Google Scholar
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Articles in the same Issue
- Contents
- Editorial
- Dear readers,
- Microscopic Characterization of Compound Layers
- Gift for the gods or scrapping over scrap metal? Metallographic examination of sword fragments from the Late Bronze Age hoard from Slavonski Brod, Croatia
- Failure Analysis
- High Cycle Fatigue Failure of a Turbocharger Wheel
- Picture of the Month
- Picture of the Month
- News
- Blechwerkstoffe auf dem virtuellen Prüfstand
- Meeting Dairy
- Meeting Diary
