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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

Stress-Corrosion Cracking of a Ship Propeller Tap Bolt

By
R. Thomson
R. Thomson
Metals Technology Laboratories, CANMET, Energy, Mines and Resources
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Published:
1992
Page range:
338 - 341

Abstract

An aluminum bronze propeller tap bolt from a twin-screw vessel fractured just below the bolt head. Liquid penetrant testing revealed a large network of cracks that extended radially from sites in and just below the bolthead. Metallographic analysis indicated that the tap bolt failed by stress-corrosion cracking. It was surmised that seawater or some other corrosive substance was present in sufficient quantity to induce intergranular cracking at regions of high stress concentration. It was recommended that all tap bolts be replaced with new bolts made from an alloy with a higher copper content and at least the same yield strength. Steps to exclude seawater and any possible source of ammonia from the bolt shank were also suggested.

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R. Thomson, 1992. "Stress-Corrosion Cracking of a Ship Propeller Tap Bolt", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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