The Mechanism of Grain Boundary in Hydrogen Embrittlement of Inconel 690 Alloy

  • Lei WangEmail author
  • Yang Liu
  • Cheng He
  • Xiu Song
Conference paper
Part of the Structural Integrity book series (STIN, volume 8)


The effects of grain boundary on tensile deformation behaviors of Inconel 690 alloy precharged with hydrogen were investigated by changing the grain size, in order to clarify the mechanism of hydrogen embrittlement of the alloy. The results show that tensile strength and elongation of precharged alloy decreases, and the decreasing degree is gradually reduced with the increase of grain size, indicating that the interaction between grain boundary and hydrogen dominate hydrogen embrittlement of Inconel 690 alloy. Hydrogen could easily migrate towards the grain boundaries following the moving dislocations during tensile, and then enrich at grain boundaries, when the strain rate is relatively low. Thus, the accumulation of hydrogen results in dislocations pile-up, and if such dislocations pile-up reaches a critical degree, the hydrogen-induced cracking will initiate at grain boundaries, which leads to the brittle intragranular fracture characteristics. That means hydrogen-enhance dislocation pile-up is the main reason for hydrogen embrittlement of Inconel 690 alloy. Therefore, how to control the ratio of grain boundary could be considered as the key to avoid the hydrogen embrittlement.


Inconel 690 alloy Grain boundary Hydrogen embrittlement 


  1. 1.
    Zhu, J.Z.: Operation of PWR Nuclear Power Plant, pp. 33–38. Atomic Energy Press, Beijing (2000)Google Scholar
  2. 2.
    Young, B.A., Gao, X., Srivatsan, T.S., et al.: The response of alloy 690 tubing in a pressurized water reactor environment. Mater. Des. 28(2), 373–379 (2007)CrossRefGoogle Scholar
  3. 3.
    Angeliu, T.M., Was, G.S.: Behavior of grain boundary chemistry and precipitates upon thermal treatment of controlled purity alloy 690. Metall. Trans. A 21(8), 2097–2107 (1990)CrossRefGoogle Scholar
  4. 4.
    Chu, W.Y.: Hydrogen Damage and Delayed Fracture, P50-52. Metall. Industry Press, Beijing (1988)Google Scholar
  5. 5.
    Robertson, I.M.: The effect of hydrogen on dislocation dynamics. Eng. Frac. Mech. 68(6), 671–692 (2001)CrossRefGoogle Scholar
  6. 6.
    Wang, F.Q., Wang, L., Liu, Y., et al.: Effect of hydrogen on fracture toughness and fracture behavior of GH690 alloy. Corr. Sci. Prot. Tech. 20(05), 380–384 (2010)Google Scholar
  7. 7.
    Wang, F.Q., Wang, L., Liu, Y., et al.: Hydrogen embrittlement behavior of GH690 alloy. J. Zhengzhou Univ. (Eng. Sci.) 30(01), 34–38 (2009)Google Scholar
  8. 8.
    Ferreira, P.J., Robertson, I.M., Birnbaum, H.K.: Hydrogen effects on the interaction between dislocations. Acta Mater. 46(5), 1749–1757 (1998)CrossRefGoogle Scholar
  9. 9.
    Stenerud, G., Johnsen, R., Olsen, J.S., et al.: Effect of hydrogen on dislocation nucleation in alloy 718. Int. J. Hydrogen Energy 42(24), 15933–15942 (2017)CrossRefGoogle Scholar

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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Key Laboratory for Anisotropy and Texture of MaterialsNortheastern UniversityShenyangChina
  2. 2.Hangzhou Steam Turbine & Power Group Co., Ltd.HangzhouChina

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