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Crack evaluation of the fourth stage blade in a low-pressure steam turbine
Engineering Failure Analysis 18 (2011) 907–913Contents lists available at ScienceDirect
Engineering Failure Analysis
journal homepage: www.elsevier .com/locate /engfai lanalCrack evaluation of the fourth stage blade in a low-pressure steam turbine
Hyojin Kim ?
Dept. of Aeronautical Engineering, Korea Aviation Polytechnic College, 438 Igeum-dong, Sacheon, Gyeongnam 664-708, Republic of Korea
a r t i c l e i n f oArticle history:
Received 10 June 2010
Received in revised form 10 October 2010
Accepted 28 November 2010
Available online 15 December 2010
Keywords:
Blade
Low-pressure steam turbine
Replication
Corrosion pit
Corrosion fatigue1350-6307/$ - see front matter 2010 Elsevier Ltd
doi:10.1016/j.engfailanal.2010.11.004
? Tel.: +82 55 830 3442; fax: +82 55 830 3440.
E-mail address: hjkimprof@a b s t r a c t
A crack of the fourth stage blade in a low-pressure turbine of a 500 MW steam turbine is
studied. From non-destructive inspection, the crack was found at the leading edge vane
of the fourth stage blade. Material composition analysis, hardness measurement and
microstructure analysis were performed to study the cause and process of the cracked
blade. On further examination using the replication of the cracked surface for the blade
vane, the crack was induced by corrosion pits. It is assumed that the causes of the corrosion
pits are the induction of seawater from the condenser tube that has small leakage, and
improper water treatment. It is shown that the corrosion pits acted as stress concentration
site and facilitated crack initiation under cyclic loading experienced during normal opera-
tion of the blade. From the fracture surface of the blade, it is concluded that the crack is
initiated from the corrosion pits at the leading edge of the blade vane, and propagated
inside by fatigue due to the vibration of the blade.
2010 Elsevier Ltd. All rights reserved.1. Introduction
Blades of a steam turbine are critical components in power plants that convert the available
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