Failure Analysis of Rotor Blades of Steam Turbine Generator of a captive power plant

Madan, M and Sujata, M and Raghavendra, K and Gore, P and Bhaumik, SK (2011) Failure Analysis of Rotor Blades of Steam Turbine Generator of a captive power plant. Project Report. National Aerospace Laboratories, Bangalore, India.

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Abstract

Two blades from the rotor of steam turbine generator (STG) of a captive power plant were sent to this laboratory for investigation. The turbine blades were suspected to have cracks after magnetic particle inspection that was carried out at the plant. However, laboratory examination did not show presence of any cracks in these blades. It appears that the crack-like indication observed during the inspection could be due to probable discontinuities on the blade surface because of the presence of thick scales. Examination revealed that the blades were metallurgically sound and there was no deterioration in the blade material due to usage. Although there were corrosion pits on the convex surface of the blades, they were found to be shallow in nature with depths in the range 50-60 m. As per the laboratory assessment, the remaining turbine blades of the rotor of STG # 5 can be continued in service. A detailed analysis of the laboratory test results is presented in this report and a few recommendations suggested.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Steel turbine blades;Pitting corrosion;Microstructure;Hardness
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division, Materials Science Division, Materials Science Division, Other, Materials Science Division
Depositing User: Ms. Alphones Mary
Date Deposited: 12 Jul 2011 14:10
Last Modified: 12 Jul 2011 14:10
URI: http://nal-ir.nal.res.in/id/eprint/9348

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