Hydrogen induced plasticity in stress corrosion cracking of engineering systems

摘要: Abstract This paper presents a review of some recent experimental results and advances in the modelling simulation hydrogen induced damage stress corrosion cracking (SCC). Experimental are presented for different material/solution systems. They outline localised character corrosion–deformation interactions that lead to SCC failure importance critical defect entry damage, particularly f.c.c. metals. Detailed observations fracture micro-crystallography 316L austenitic stainless steel single crystals boiling MgCl2 presented. support successive steps enhanced plasticity model, which is based on local softening crack region repeated formation dislocation pile-up at distance ahead crack. Critical experiments highlight nature hydrogen–plasticity also this model. A method It reproduces decrease long-range between dislocations presence hydrogen. general expression given such as function temperature, concentration material parameters. shown solid solution favours planar slip pile-ups. The equilibrium configuration studied it diffusing promotes concentrations against micro-structural obstacles periodic micro-fracture along planes. Finally, effect source tip investigated. Hydrogen promote brittle particular orientations crystals.