Effect of hydrogen and frequency on fatigue behavior of SCM435 steel for storage cylinder of hydrogen station
作者： Hiroyuki TANAKA , Nobuhiro HOMMA , Saburo MATSUOKA , Yukitaka MURAKAMI
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摘要: Fatigue tests on SCM435 steel quenched at 860°C and tempered 580°C were carried out under the frequencies of 0.2, 2 20 Hz with specimens containing a small artificial hole. An additional test in which frequency was alternatively switched between 0.02 also out. Hydrogen charging to by immersion method. The fatigue life hydrogen-charged decreased comparison that uncharged specimens. acceleration crack growth rate da/dN observed dα/dN<1.0×10-7m/cycle f=20 Hz, dα/dN<4.0×10-7 m/cycle f=2Hz dα/dN<1.5×10-6 f=0.2 Hz. dα/dN saturated ΔK<17 MPa√m f≤2Hz. It found there is upper bound effects hydrogen environment. switching two showed concentration vicinity tip remarkably affects behavior morphology. most remarkable change slip bands around less discrete compared
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