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Cracks on the Roots of Turbine Blades of the Low-Pressure Turbine in a Steam Power Plant

  • E. Plesiutschnig , R. Vallant , G. Stöfan , C. Sommitsch , M. Mayr , A. Marn and F. Heitmeier
Published/Copyright: March 28, 2015
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Practical Metallography
From the journal Practical Metallography Volume 52 Issue 4

Abstract

Cracks were found in the roots of steam turbine blades of the third blade row (LA-2) of the low-pressure turbine during revision works in a coal-fired power plant. Metallographic examinations reveal pitting corrosion sites, branched cracks, and local plastic deformation at the root of the first load bearing flank radius. The fracture surface was analyzed using light microscopy and scanning electron microscopy (SEM). Finite element (FE) simulations were performed in order to qualitatively represent the stress peak positions on the blade root.

Kurzfassung

Bei Revisionsarbeiten eines Kohlekraftwerkes wurden in der Niederdruckturbine Fußrisse an den Dampfturbinenschaufeln der 3. Laufreihe (LA-2) entdeckt. Metallografische Untersuchungen zeigen Positionen mit Lochkorrosion, verzweigte Risse und lokale plastische Verformung am Fuße des ersten Tragflankenradius. Die Bruchfläche wurde mit Lichtmikroskopie und Rasterelektronenmikroskopie (REM) analysiert. Finite Elemente (FE) Simulationen wurden durchgeführt, um die Positionen der Spannungsspitzen am Schaufelfuß qualitativ darzustellen.

Translation: E. Engert

References / Literatur

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Received: 2014-07-31
Accepted: 2014-10-25
Published Online: 2015-03-28
Published in Print: 2015-04-15

© 2015, Carl Hanser Verlag, München

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  8. Cracks on the Roots of Turbine Blades of the Low-Pressure Turbine in a Steam Power Plant
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https://doi.org/10.3139/147.110318

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Heat Treatment-Induced Improvement of the Thermal Shock Resistance of Si3N4 Tools for Metallurgical Applications
  7. Imaging Structural Damage of Bacteria on Antibacterial Copper – a Scanning Electron Microscopy Study Using FIB Cross-Sectioning
  8. Cracks on the Roots of Turbine Blades of the Low-Pressure Turbine in a Steam Power Plant
  9. Meeting Diary/Veranstaltungskalender
  10. Meeting Diary
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