Corrosion fatigue behaviors have been studied on low carbon steels and high tensile steels in 3%NaCl. The corrosion fatigue strength against the number of cycles was estimated by the following formula.
σ
ac=σ
a/(1+
B·f-p·Nfp+q)
where σ
a is the fatigue strength tested in air,
f is the cyclic speed,
Nf is the fatigue life to failure, and
B, p, q are the material constants.
It was obtained experimentally that the material constants were given as follows;
(1) For a plain specimen of SM41B steel and a notched specimen of HT 80 steel,
B=2.14×10
-4,
p=0.39,
q=0.36 under plane bending corrosion fatigue tests.
(2) For a plain specimens of HT 80, HY 110, and HY 130 steels,
B=4.78×10
-4,
p=0.39,
q=0.36 under plane bending corrosion fatigue tests.
(3) For a plain specimen of SM41B steel,
B=1.08×10
-4,
p=0.39,
q=0.36 under tention and compression corrosion fatigue tests.
(4) The material constant
B is given by the following function.
B=8.7×10
-4logσ
w-1.0×10
-3where σ
w is the fatigue limit tested in air.
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