Effect of hydrogen and frequency on fatigue behavior of SCM435 steel for storage cylinder of hydrogen station

Hiroyuki Tanaka, Nobuhiro Homma, Saburo Matsuoka, Yukitaka Murakami

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

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

Original languageEnglish
Pages (from-to)1358-1365
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume73
Issue number12
Publication statusPublished - Dec 2007

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Steel
Hydrogen
Fatigue of materials
Fatigue crack propagation
Crack tips
Cracks

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

Effect of hydrogen and frequency on fatigue behavior of SCM435 steel for storage cylinder of hydrogen station. / Tanaka, Hiroyuki; Homma, Nobuhiro; Matsuoka, Saburo; Murakami, Yukitaka.

In: Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A, Vol. 73, No. 12, 12.2007, p. 1358-1365.

Research output: Contribution to journalArticle

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