Comparison of the near-threshold corrosion fatigue crack propagation rates in MiL S-24645 HSLA steel and its weld metal

Judith Todd Copley, L. Chen, E. Y. Yankov, H. Tao, G. H. Reynolds

Research output: Contribution to conferencePaper

2 Scopus citations

Abstract

Near-threshold corrosion fatigue crack propagation studies have been conducted using compact tension specimens of Mil S-24645 HSLA steel and a compatible weld metal in air, ASTM seawater at the free corrosion potential, and ASTM seawater with -0.8V and -1.0V (SCE) cathodic protection. Tests were conducted at 10 Hz and a stress ratio, R = 0.1. The weld metal exhibited slower crack growth rates and higher threshold stress intensity ranges in both air and ASTM seawater than the base metal. However, the weld metal itself exhibited similar behavior in air, ASTM seawater and under cathodic protection, giving a threshold stress intensity range of 11 to 14 MPa m 1/2 . With the exception of the weld metal tested in air, after correction for crack closure, the effective threshold stress intensity range was reduced to the range 3.5 to 5.5 MPa m 1/2 . Metal wedges, approximately 5 to 10 μm (1-2 grain sizes), which developed during the tests, were observed to contribute to crack closure in the -1.0V (SCE) cathodically protected specimens.

Original languageEnglish (US)
Pages557-564
Number of pages8
StatePublished - Jan 1 1992
EventProceedings of the 11th International Conference on Offshore Mechanics and Arctic Engineering - OMAE 92 - Calgary, Alberta, Can
Duration: Jun 7 1992Jun 12 1992

Other

OtherProceedings of the 11th International Conference on Offshore Mechanics and Arctic Engineering - OMAE 92
CityCalgary, Alberta, Can
Period6/7/926/12/92

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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    Todd Copley, J., Chen, L., Yankov, E. Y., Tao, H., & Reynolds, G. H. (1992). Comparison of the near-threshold corrosion fatigue crack propagation rates in MiL S-24645 HSLA steel and its weld metal. 557-564. Paper presented at Proceedings of the 11th International Conference on Offshore Mechanics and Arctic Engineering - OMAE 92, Calgary, Alberta, Can, .