TY - JOUR
T1 - A comparison of the near-threshold corrosion fatigue crack propagation rates in mil S-24645 HSLA steel and its weld metal
AU - Todd, J. A.
AU - Chen, L.
AU - Yankov, E. Y.
AU - Tao, H.
PY - 1993/5
Y1 - 1993/5
N2 - 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 -l.OV (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 in 1/2 (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 in 1/2 (3.5 to 5.5 MPa m1/2). Metal wedges, approximately 5 to 10 μ, m (1-2 grain sizes), which developed during the tests, were observed to contribute to crack closure in the - l.OV (SCE) cathodically protected specimens.
AB - 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 -l.OV (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 in 1/2 (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 in 1/2 (3.5 to 5.5 MPa m1/2). Metal wedges, approximately 5 to 10 μ, m (1-2 grain sizes), which developed during the tests, were observed to contribute to crack closure in the - l.OV (SCE) cathodically protected specimens.
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U2 - 10.1115/1.2920102
DO - 10.1115/1.2920102
M3 - Article
AN - SCOPUS:0027514762
SN - 0892-7219
VL - 115
SP - 131
EP - 136
JO - Journal of Offshore Mechanics and Arctic Engineering
JF - Journal of Offshore Mechanics and Arctic Engineering
IS - 2
ER -