Near-Threshold Fatigue Crack Growth Behavior of Mil S-24645 HSLA Steel and Its Weldments

[+] Author and Article Information
J. A. Todd, L. Chen, E. Y. Yankov

Department of Metallurgical and Materials Engineering, Illinois Institute of Technology, Chicago, IL 60616

J. Offshore Mech. Arct. Eng 115(3), 154-161 (Aug 01, 1993) (8 pages) doi:10.1115/1.2920107 History: Received April 20, 1993; Revised June 01, 1993; Online June 12, 2008


The near-threshold corrosion fatigue crack propagation behavior of Mil S-24645 HSLA steel, its weld metal and heat-affected zone have been studied in simulated marine environments. Tests were conducted in air and ASTM seawater, at both the free corrosion potential and −1.0V (SCE), using a frequency of 0.2 Hz and a stress ratio, R = 0.1. The results were compared with previous data for Mil S-24645 and ASTM A710 steel tested at frequencies of 10 and 2 Hz. The influence of frequency, microstructure, and cathodic protection on crack closure contributions in the near-threshold regime will be discussed.

Copyright © 1993 by The American Society of Mechanical Engineers
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