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ASM Failure Analysis Case Histories

Handbook of Case Histories in Failure Analysis

Edited by
Khlefa A. Esaklul
Khlefa A. Esaklul
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ASM International
Volume
1
ISBN electronic:
978-1-62708-214-3
Publication date:
1992
Book Chapter

Degradation of a Main Combustion Chamber Liner on a Space Shuttle Main Engine

By
J.H. Sanders
J.H. Sanders
IIT Research Institute, Marshall Space Flight Center
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;
P.S. Chen
P.S. Chen
IIT Research Institute, Marshall Space Flight Center
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;
R.A. Parr
R.A. Parr
National Aeronautics and Space Administration, Marshall Space Flight Center
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Published:
1992
Page range:
56 - 60

Abstract

Pinhole defects were found in a main combustion chamber made from NARloy-Z after an unexpectedly short time in service. Analysis indicated that the throat section of the liner had been exposed to very severe environmental conditions of high temperature and high oxygen content, which caused ductility loss and grain-boundary separation. The excessive oxygen content in the liner was attributed to diffusion from an oxygen-rich environment that had resulted from nonuniform mixing of propellants. The internal oxygen embrittled the alloy and reduced its thermal conductivity, which resulted in a higher hot-gas wall temperature and associated degradation of mechanical properties.

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J.H. Sanders, P.S. Chen, R.A. Parr, 1992. "Degradation of a Main Combustion Chamber Liner on a Space Shuttle Main Engine", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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