Simulation of Blister Growth in Hydrogen-Induced Cracking of Rolled Pure Iron.

Abstract

The commercially supplied pure iron which was rolled to various reductions was cathodically hydrogen-charged in sulfuric acid solution to investigate the blister growth behavior in hydrogen-induced cracking. In addition, a computer simulation was carried out to predict the blister growth characteristics. The experimental result showed that the diameter of blisters increased with increasing charging time and rolling reduction. By assuming an increase in dislocation density (hydrogen trapping site) and an increase in growth rate of blister with increasing rolling reduction, the computer simulation could well predict the blister growth process and the three-dimensional distribution of blisters inside the material.