A Comparison of the Near-Threshold Corrosion Fatigue Crack Propagation Rates in Mil S-24645 HSLA Steel and Its Weld Metal

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 con...

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Bibliographic Details
Published in:Journal of offshore mechanics and Arctic engineering 1993-05, Vol.115 (2), p.131-136
Main Authors: Todd, J. A, Chen, L, Yankov, E. Y, Tao, H
Format: Article
Language:English
Subjects:
420500 - Engineering- Materials Testing
423000 - Engineering- Marine Engineering- (1980-)
ALLOYS
BUILDING MATERIALS
CATHODIC PROTECTION
CORROSION FATIGUE
CORROSION PROTECTION
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
CRACK PROPAGATION
ENGINEERING
FABRICATION
FATIGUE
FORCING FUNCTIONS
FRACTURE MECHANICS
FRACTURE PROPERTIES
FUNCTIONS
HYDROGEN COMPOUNDS
JOINING
JOINTS
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICS
OFFSHORE PLATFORMS
OXYGEN COMPOUNDS
RESPONSE FUNCTIONS
SEAWATER
STRESSES
TENSILE PROPERTIES
TESTING
WATER
WELDED JOINTS
WELDING
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Description
Summary: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 10 to 12.7 ksi in1/2 (11 to 14 MPa m1/2). 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 3.2 to 5.0 ksi in1/2 (3.5 to 5.5 MPa m1/2). 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.
ISSN:0892-7219
1528-896X
DOI:10.1115/1.2920102