Effect of test frequency on hydrogen-enhanced fatigue crack growth in type 304 stainless steel and ductile cast iron

Hisao Matsunaga, Takuya Nakashima, Kosei Yamada, Takashi Matsuo, Junichiro Yamabe, Saburo Matsuoka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

The effect of hydrogen gas environment (external hydrogen) and hydrogen-charging (internal hydrogen) on the fatigue crack growth (FCG) in two materials, austenitic stainless steel Type 304 and ductile cast iron, was investigated at various test frequencies. The pressure of hydrogen gas was 0.7 MPa. Both in the tests of external hydrogen and internal hydrogen, ratio of hydrogen-induced FCG acceleration was gradually increased with a decrease in test frequency in the range of 10 ∼ 0.1 Hz, and then peaked out at 0.1 ∼ 0.01 Hz. The frequency at the maximum acceleration was dependent on materials and test types (i.e. external hydrogen or internal hydrogen). It has been pointed out that, in the test of external hydrogen, a small amount of oxygen impurity contained in hydrogen gas, if any, adsorbs on newly-created crack surface, which inhibits hydrogen penetration into the material near crack tip. Lower frequency allows longer time for oxygen adsorption, and consequently, hydrogen-induced acceleration cannot be prominent at very low frequencies (e.g. 0.001 Hz). However, in this study, similar frequency dependence of hydrogen-induced FCG acceleration was also observed in the case of internal hydrogen. The results inferred the presence of another mechanism producing the frequency dependence of hydrogen-induced FCG acceleration, i.e. hydrogen-induced slip localization dominated by the gradient of hydrogen concentration ahead of crack tip.

Original languageEnglish
Title of host publicationMaterials and Fabrication
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791850435
DOIs
Publication statusPublished - Jan 1 2016
EventASME 2016 Pressure Vessels and Piping Conference, PVP 2016 - Vancouver, Canada
Duration: Jul 17 2016Jul 21 2016

Publication series

NameAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume6B-2016
ISSN (Print)0277-027X

Other

OtherASME 2016 Pressure Vessels and Piping Conference, PVP 2016
CountryCanada
CityVancouver
Period7/17/167/21/16

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All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

Matsunaga, H., Nakashima, T., Yamada, K., Matsuo, T., Yamabe, J., & Matsuoka, S. (2016). Effect of test frequency on hydrogen-enhanced fatigue crack growth in type 304 stainless steel and ductile cast iron. In Materials and Fabrication (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP; Vol. 6B-2016). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/PVP2016-63536