The internal stress induced by a porous layer or passive layer can assist the applied stress to promote dislocation emission and crack propagation, e:g: when the pipeline steel is buried in the soil containing water, resulting in stress corrosion cracking (SCC). Molecular dynamics (MD) simulation is performed to study the process of dislocation emission and crack propagation in a slab of Fe crystal with and without a porous layer on the surface of the crack. The results show that when there is a porous layer on the surface of the crack, the tensile stress induced by the porous layer can superimpose on the external applied stress and then assist the applied stress to initiate crack tip dislocation emission under lowered stress intensity KI, or stress. To respond to the corrosion accelerated dislocation emission and motion, the crack begins to propagate under lowered stress intensity KI; resulting in SCC.
参考文献
| [1] | R.N. Parkins: Proc. of Corrosion 2000, NACE Inter, Houston, Texas, 2000, 00363,.[2 ] I. Cerny and V. Linhart: Eng. Fract. Mech., 2004, 71, 913.[3 ] J.Q. Wang and A. Atrens: Corros. Sci., 2003, 45, 2199.[4 ] Z.Y. Liu, X.G. Li, C.W. Du , G.L. Zhai and Y.F. Cheng: Corros. Sci., 2008, 50, 2251.[5 ] G. Van Boven, W. Chen and R. Rogge: Acta Mater., 2007, 55, 29.[6 ] B.W. Pan, X. Peng, W.Y. Chu, Y.J. Su and L.J. Qiao: Mater. Sci. Eng. A, 2006, 434, 76.[7 ] X.Z. Guo, K.W. Gao, L.J. Qiao and W.Y. Chu: Metall. Mater. Trans. A, 2001, 32, 1309.[8 ] X.J. Guo, K.W. Gao, L.J. Qiao and W.Y. Chu: Corros. Sci., 2002, 44, 2367.[9 ] X.Z. Guo, K.W. Gao, W.Y. Chu and L.J. Qiao: Mater. Sci. Eng. A, 2003, 346, 1.[10] H. Lu, K.W. Gao and W.Y. Chu: Corros. Sci ., 1998, 40, 1663.[11] H. Lu, K.W. Gao, Y.B. Wang and W.Y. Chu: Corrosion, 2000, 56, 1112.[12] Q.K. Li, Y. Zhang and W.Y. Chu: Comput. Mater. Sci., 2002, 25, 510.[13] Q.K. Li, Y. Zhang, S.Q. Shi and W.Y. Chu: Mater. Lett., 2002, 56, 927.[14] D. Li, F.Y. Meng, X.Q. Ma, L.J. Qiao and W.Y. Chu. Comput. Mater. Sci., 2010, 49, 641.[15] J.F. Knott: Foundamentals of Fracture Mechanics, Butterworths, London, 1973, 57.[16] G.C. Sih and H. Liebowitz: Fracture: an Advanced Treatise, Vol. 2, Academic Press, New York and London, 1968, 127.[17] M.S. Daw and M.I. Baskes: Phys. Rev. B, 1984, 29, 6443.[18] V. Shastry and D. Farkas: Mater. Res. Soc. Symp. Proc., 1996, 409, 75.[19] B. Mutasa and D. Farkas: Surf. Sci., 1998, 415, 312. [20] S. Toxvaerd: J. Comput. Phys., 1982, 47, 444.[21] H.J. C. Berendsen, J.P.M. Postma, W.F.V. Gunsteren, A. Dinola and J.R. Haak: J. Chem. Phys., 1984, 81, 3684. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%