Digital Repository, ICF12, Ottawa 2009

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Loading-Frequency Effects on Fatigue Crack Growth Behavior of a Low Carbon Steel in Hydrogen Gas Environment
H. Nishikawa, Y. Oda, H. Noguchi

Last modified: 2013-05-03


It is necessary to clarify the load frequency and duration time effects on the
fatigue crack growth behavior to estimate the fatigue life and strength [1,2]. It has
been reported that the fatigue crack growth rate of austenitic stainless steel and
aluminum alloy in hydrogen gas environment accelerate at a low test frequency
and it saturates below a certain frequency. This tendency is based on the slip-off
mechanism of fatigue crack propagation. However, the fatigue crack growth rate
of carbon steel in hydrogen gas is more than ten times the rate in nitrogen. The
fracture surface in hydrogen gas exhibits quasi-cleavage fracture with brittle
striations [3]. It may have another mechanism for the fatigue crack growth [4,5].
Therefore, there is a possibility that the loading frequency effect differs from
austenitic stainless steel and aluminum alloy.

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