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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

Failure Analysis of a Hydroturbine Shaft

By
Donald R. McCann
Donald R. McCann
A-C Siemens Power Corporation
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;
Michael V. Harry
Michael V. Harry
A-C Siemens Power Corporation
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Published:
1993
Page range:
337 - 342

Abstract

A forged 4140 steel shaft that connected two runners in a hydroturbine failed catastrophically after approximately 5900 h of service. The runner and the mating section of the broken shaft were examined and tested by various methods. The results of the analyses indicated that the shaft failed by torsional fatigue starting at subsurface crack initiation sites. The forging contained regions of crack like flaws associated with particles rich in chromium, manganese, and iron. Fracture features indicated that the fatigue cracks propagated under a relatively low stress.

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Donald R. McCann, Michael V. Harry, 1993. "Failure Analysis of a Hydroturbine Shaft", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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