The mechanism of hydrogen embrittlement on the basis of the interaction model of dislocations and hydrogen around a crack tip

Article type: Research Article

Authors: Yokobori, Jr., A.T.^; | Taketomi, S. | Ha, J.C. | Shoji, T. | Li, G.F.

Affiliations: Department of Nano Mechanics, Graduate School of Engineering, Tohoku University, Aoba 6‐6‐01, Aramaki, Aoba‐ku, Sendai‐shi #980‐8579, Japan | Fracture Research Institute, Graduate School of Engineering, Tohoku University, Aoba 6‐6‐01, Aramaki, Aoba‐ku, Sendai‐shi #980‐8579, Japan | Faculty of Science and Engineering, Teikyo University, Utsunomiya, Toyosatodai 1‐1, Utsunomiya‐shi #320‐8551, Japan

Note: [] Corresponding author. E‐mail: yokobori@md.mech.tohoku.ac.jp.

Abstract: Mechanisms of dissolvent anodic chemical reaction and hydrogen embrittlement were proposed as stress corrosion cracking mechanics (SCC). The former is feasible for the case of plastic deformation dominant metals and the latter is for high strength metals such as high strength steels. However, in spite of low yield stress, a discontinuous cleavage‐like fracture is sometimes observed during SCC for ductile fcc alloys. In this paper, we proposed stress corrosion cracking model on the basis of interaction of dislocation and hydrogen around a crack tip to predict discontinuous cleavage‐like fracture during SCC for ductile fcc alloys. Furthermore, we conducted numerical analyses using this proposed model.

Keywords: Stress corrosion, hydrogen embrittlement, dislocation dynamics, fcc alloys, cleavage‐like fracture

Journal: Strength, Fracture and Complexity, vol. 2, no. 3, pp. 95-109, 2004