Metallurgical analysis of rotary slide valve of an aeroengine

Sujata, M and Bhaumik, SK (2003) Metallurgical analysis of rotary slide valve of an aeroengine. Project Report. National Aerospace Laboratories, Bangalore.

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Abstract

A portion (half cut) of the slide and the sleeve of a failed rotary slide valve (RSV) were forwarded to the laboratory for analysis. Examination revealed that the RSV has got seized at the land towards to cardon shaft. Presence of hard abrasive particles was observed in the seized region. Chemical analysis indicated these particles to be rich in silicon, aluminium and oxygen. The size of the particles was found to be in the range 10-30 m. No damages were observed at the edges of the working lands. However, a few shallow circumferential scoring marks were observed on these lands and also on the corresponding locations in the sleeve. The volume percent retained austenite in sleeve and slide was measured to be 5.8  0.5 and 5.3  0.4 respectively.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Aeroengine;Rotary slide valve;seizure;retained austenite
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division, Materials Science Division
Depositing User: Mrs Manoranjitha M D
Date Deposited: 12 Jul 2011 10:29
Last Modified: 12 Jul 2011 10:29
URI: http://nal-ir.nal.res.in/id/eprint/9333

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