5Nagumo M, Takai K, Okuda N. Nature of hydrogen trapping sites in steels induced by plastic deformation[J]. Journal of Al- loys and Compounds, 1999, 293-295:310.
6Krom A H M, Bakker A. Hydrogen trapping models in steel[J]. Metallurgical and Materials Transactions B, 2000, 31 : 1475.