Schwingfestigkeitsverhalten von Edelstählen in Wasser

Translated title of the contribution: Fatigue behaviour of high quality steels in water

Marlies Borchert

Research output: ThesisDiploma Thesis


The Kaplan turbine is a water turbine with adjustable blades, where the water inflow is axially. The gear box is filled with oil in order to prevent corrosion. In this thesis, a more environmentally friendly corrosion protection is investigated and the influence of the corrosion inhibitor on the corrosion fatigue is examined. The investigated materials are a X3CrNiMo13-4 and a 20Mn5 steel. Electrochemical studies have shown that both materials exhibit pitting attacks in the medium with addition of inhibitor. Furthermore, the fatigue behaviour is strongly influenced. The level of the fatigue strength X3CrNiMo13-4 in the medium without inhibitor is about 50 MPa lower than that of air. In the medium with inhibitor it is about 100 MPa lower. The 20Mn5 steel shows a fatigue limit in air, whereas in the medium all samples fail due to corrosion attack. Thus, the investigated inhibitor is not suitable for application at ambient temperature and in untreated water.
Translated title of the contributionFatigue behaviour of high quality steels in water
Original languageGerman
  • Clemens, Helmut, Supervisor (internal)
Award date13 Dec 2013
Publication statusPublished - 2013

Bibliographical note

embargoed until 13-09-2018


  • corrosion fatigue
  • inhibitor
  • pitting
  • high quality steel
  • fatigue strength

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