Abstract
Low cycle fatigue tests on SCM435 steel tempered at 580℃ were carried out under the frequencies of 0.2, 2 and 20Hz with specimens containing a small artificial hole. The fatigue life of the hydrogen charged specimens decreased in comparison with the uncharged specimens. The acceleration of fatigue crack growth rate was observed at ΔK<40MPa√<minf=20Hz>, ΔK<60MPa√<minf=2Hz> and ΔK<100MPa√<minf=0.2Hz>. Facets were formed on the fracture surface of hydrogen charged specimens in the ΔK region where the crack growth rate was accelerated. Many slip bands were observed at the crack tip of the uncharged specimens. On the other hand, slip bands were not clear the hydrogen-charged specimens.
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