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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

Environmental Cracking of a Low-Alloy Steel Welded Impeller Cover From a Centrifugal Unit

By
Harry E. Ebert
Harry E. Ebert
Dresser-Rand, Turbo Products Division
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Published:
1992
Page range:
210 - 212

Abstract

Radial cracking occurred adjacent to 11 vanes in a 19-vane impeller operating in a chemical plant environment. The impeller vanes were fillet welded to both the disk and the cover Cracks were next to the fillet welds and near the cover outer diameter They generally did not extend to the outer diameter. The entire impeller surface was tested by the dry magnetic particle method. Visual and microstructural examinations revealed intergranular cracking. Energy-dispersive spectroscopy of corrosion products contained in the cracks disclosed the presence of chlorine and sulfur The failure was attributed to stress-corrosion cracking caused by a corrosive atmosphere.

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Harry E. Ebert, 1992. "Environmental Cracking of a Low-Alloy Steel Welded Impeller Cover From a Centrifugal Unit", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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