AN INTEGRATED APPROACH TO THE MODELING OF HYDROGEN-ASSISTED FAILURE IN 316L STEEL

An integrated approach to the modelling of hydrogen assisted failure i n 316L steel is presented. The approach includes experimental, fractog raphic, numerical and theoretical analysis of the phenomenon. The phys ical adequacy of the mechanical models of hydrogen embrittlement (notc h extension model and notch cracking model) is discussed by comparing the virtual damage depth (theoretical) predicted by the models with th e embrittled zone (microphysical) measured in the fractographic analys is by scanning electron microscopy. In addition, a numerical modelling of hydrogen diffusion is performed, concluding that bulk diffusion is not important in hydrogen embrittlement of 316L steel, so that hydrog en transport accelerated by the microdamage itself should be taken int o account. (C) 1998 Elsevier Science S.A. All rights reserved.