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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
2
ISBN electronic:
978-1-62708-215-0
Publication date:
1993
Book Chapter

Metallurgical Failure Analysis of Cracks in a Compressor Turbine Impeller

By
Edward V. Bravanec
Edward V. Bravanec
Anderson & Associates, Inc.
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Published:
1993
Page range:
333 - 336

Abstract

Cracking was discovered in an in-service, second-stage turbine impeller during a downtime inspection. The fabricated 4300 series low-alloy steel impeller was used in a compressor in an industrial petrochemical plant. It was also reported that a process upset had allowed a 10% NaOH solution to be ingested by the unit. Routine magnetic particle inspection revealed numerous cracks in the hub area and vane tips of the second-stage impeller Additionally, the outside surface of the backing plate showed a cyclic pattern of cracks. An overview of a conventional, systematic metallurgical approach to failure analysis to confirm that the cracking was caused by a caustic stress-corrosion cracking mechanism is presented.

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Edward V. Bravanec, 1993. "Metallurgical Failure Analysis of Cracks in a Compressor Turbine Impeller", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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