Fatigue Crack Propagation in Hydrogen Gas in Low Alloyed Steel

Christine Sarrazin-Baudoux; Catherine Gardin; V.X. Tran; T.H. Pham; Jean Petit

doi:10.4028/www.scientific.net/KEM.627.149

Paper Titles

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The Effect of Specimen Size on the Determination of Residual Stress in Polymer Pipe Wall
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Description of Fatigue Crack Propagation under Mixed-Mode II+III in Terms of J-Integral
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Fatigue Crack Propagation in Hydrogen Gas in Low Alloyed Steel
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Hydrogen-Assisted Rolling-Contact Fatigue of Wind Turbines Bearings
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HomeKey Engineering MaterialsKey Engineering Materials Vol. 627Fatigue Crack Propagation in Hydrogen Gas in Low...

Fatigue Crack Propagation in Hydrogen Gas in Low Alloyed Steel

Abstract:

This paper deals with fatigue crack propagation under 4 bar hydrogen atmosphere in low alloyed steel (3.5Ni-1.5Cr-0.5Mo-V) used for turbine generator of nuclear plant. The tests are conducted in the same way in ambient air and high vacuum on CT specimens and the fatigue crack growth rate specially investigated in the near threshold range is plotted with respect to the applied stress intensity factor. It is shown that the propagation under hydrogen atmosphere is similar to that obtained in air up to a K_max value of 16,5 MPam^1/2 with increased growth rate compared to that in high vacuum leading to a threshold value lower that in vacuum, this effect being related to residual water vapor. For K_max higher than 16,5 MPam^1/2, much faster growth rates under hydrogen atmosphere becomes are associated to an intergranular propagation mechanism induced by an hydrogen effect. The results are discussed on the basis of available models.

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Periodical:

Key Engineering Materials (Volume 627)

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149-152

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.627.149

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Online since:

September 2014

Authors:

Christine Sarrazin-Baudoux, Catherine Gardin, V.X. Tran, T.H. Pham, Jean Petit

Keywords:

Crack Closure, Environmentally Assisted Propagation, Fatigue Crack Propagation, Hydrogen, Low Carbon Steel, Martensitic Stainless Steel

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