Fatigue-Crack Growth in an X-65 Line-Pipe Steel at Low Cyclic Frequencies in Aqueous Environments

[+] Author and Article Information
O. Vosikovsky

Physical Metallurgy Div., Mines Branch, Dept. of Energy, Mines and Resources, Ottawa, Canada

J. Eng. Mater. Technol 97(4), 298-304 (Oct 01, 1975) (7 pages) doi:10.1115/1.3443302 History: Received September 09, 1974; Revised April 16, 1975; Online August 17, 2010


The effects of salt and distilled water environments on fatigue-crack growth rates have been evaluated for an X-65 line-pipe steel. Tests were conducted over a frequency range between 10 and 0.01 Hz, under conditions of cathodic potential and free corrosion. A distinct pattern in the functional dependence of growth rates on ΔK and frequency has been found. Maximum environmental enhancement of growth rates was 50 times that of air at a cathodic potential of −1.04V, and 10 times that of air at a free-corrosion potential of −0.68V. In each case it occurred at the lowest frequency and at relatively high values of ΔK. Hydrogen embrittlement and the two-stage cracking process are examined as the main mechanisms of growth acceleration.

Copyright © 1975 by Crown copyright reserved
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