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Journal Articles Procedia Engineering Year : 2015

Fatigue Crack Propagation in Gaseous Hydrogen Environment in Low Alloy Steel

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Christine Sarrazin-Baudoux
  • Function : Author
  • PersonId : 946572
Catherine Gardin
  • Function : Author
Gaëlle Chretien
  • Function : Author
Jean Petit
  • Function : Author
Van-Xuan Tran
  • Function : Author
EDF
Guillaume Benoit
  • Function : Author

Abstract

Fatigue crack propagation in low alloyed steel (3.5Ni-1.5Cr-0.5Mo-V) used for turbine generator of nuclear plant is studied under 4 bar hydrogen atmosphere in comparison to ambient air and high vacuum. Tests are conducted on CT specimens and the variation of the fatigue crack growth rate da/dN with respect to the amplitude of the applied stress intensity factor ΔK is explored in a wide range and especially in the near threshold domain. The propagation behaviour under hydrogen atmosphere is shown similar to that obtained in air in the low rate range, i.e. when the maximum of the stress intensity factor Kmax is lower than a critical level of 16 MPam1/2 with higher crack growth rate than in high vacuum. This environment effect is related to the presence of residual water vapour in both gases. For Kmax higher than 16 MPam1/2, much faster growth rates under hydrogen atmosphere in comparison to air and vacuum are observed and related to hydrogen assisted intergranular propagation combining fatigue and sustained loading damage. The results are discussed on the basis of micrographic observations supporting the involved mechanisms.
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hal-01348198 , version 1 (22-07-2016)

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Christine Sarrazin-Baudoux, Catherine Gardin, Tuan Hiep Pham, Gaëlle Chretien, Jean Petit, et al.. Fatigue Crack Propagation in Gaseous Hydrogen Environment in Low Alloy Steel. Procedia Engineering, 2015, ICSI 2015 The 1st International Conference on Structural Integrity Funchal, Madeira, Portugal 1st to 4th September, 2015, 114, pp.354-360. ⟨10.1016/j.proeng.2015.08.079⟩. ⟨hal-01348198⟩
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