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Effects of Hydrogen Environment on Fatigue Characteristics of 18Cr-8Ni Stainless Steel

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Abstract:

In order to clarify the effects of hydrogen on the fatigue characteristics of an austenitic stainless steel, bending fatigue tests were conducted in air, in a hydrogen gas and in a nitrogen gas. Main results obtained are as follows. Effects of hydrogen gas environment are not clearly seen on the strain range - fatigue life diagram, because there are opposite effects to crack propagation and to crack initiation; accelerates crack propagation, but retards crack initiation. Striation spacing or in-situ observation confirms the acceleration. The retardation seems to be attributed to the absence of oxygen or water vapor in the hydrogen gas.

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Periodical:

Materials Science Forum (Volume 482)

Pages:

283-286

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.482.283

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Online since:

April 2005

Authors:

Kyohei Kawamoto, Y. Aoki, Yasuji Oda, Takeshi Yoshimura, Hiroshi Noguchi, Kenji Higashida

Keywords:

Austenitic Stainless Steel, Crack Initiation, Crack Propagation, Fatigue, Hydrogen Embrittlement, Slip Band, Striation

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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References

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