International Journal of Fracture

, Volume 168, Issue 1, pp 101–112 | Cite as

Influence of hydrogen and frequency on fatigue crack growth behavior of Cr-Mo steel

  • Saburo Matsuoka
  • Hiroyuki Tanaka
  • Nobuhiro Homma
  • Yukitaka Murakami
Original Paper


Fatigue tests on Cr-Mo 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 test frequency was alternately switched between 0.02 and 2 Hz was carried out. Hydrogen charging to the specimens was carried out by an immersion method. The fatigue life of the hydrogen-charged specimens remarkably decreased in comparison with that of the uncharged specimens. The fatigue crack growth rate da/dN increased with decreasing the test frequency f. The acceleration of da/dN saturated at \({\Delta K\,<\,17\,{\rm MPa}\sqrt{m}}\) for f ≤ 2 Hz. The presence of the upper bound for the fatigue crack growth acceleration was found with respect to the effects of hydrogen and test frequency in a hydrogen environment. The test switching the frequency between 0.02 and 2 Hz resulted the difference in fatigue crack growth morphology which is presumed to be caused by the difference in hydrogen concentration in the vicinity of crack tip. The particular crack morphology under the low test frequency with hydrogen was the localization of the slip around the crack tip and the linearization of the crack growth path. The hydrogen-enhanced striation formation model which was proposed to explain the effect of hydrogen on the fatigue crack growth for an austenitic stainless steel and low carbon steel can be applied also to the quenched and tempered Cr-Mo steel in this study.


Fatigue Crack propagation Hydrogen embrittlement Frequency Slip band 


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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Saburo Matsuoka
    • 1
  • Hiroyuki Tanaka
    • 1
    • 2
  • Nobuhiro Homma
    • 1
    • 3
  • Yukitaka Murakami
    • 1
  1. 1.Faculty of EngineeringKyushu UniversityFukuokaJapan
  2. 2.NISSAN Motor Co., Ltd.Yokohama-shi, KanagawaJapan
  3. 3.Mitsubishi Heavy Industries Ltd.Kobe-shi, HyogoJapan

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