Title: Hydrogen Damage in Multiphase Steels after Electrochemical Charging
Abstract: INTRODUCTION The harmful consequences of the exposure of steel to a hydrogen containing environment was first discussed by Johnson [1]. He showed that hydrogen caused a decrease in ductility leading to hydrogen embrittlement. High strength steels turn out to be even more sensitive to this phenomenon. Nowadays, the use of high strength steels in hydrogen rich environments becomes increasingly important in industry. Therefore, before using these steels in this type of environment, a detailed study of their interaction with hydrogen is a prerequisite to be able to predict the potential damage, i.e. hydrogen blisters, hydrogen embrittlement and hydrogen induced cracking, which might occur during use. Blisters appear in many materials in the absence of external stress when the hydrogen concentration is above a certain threshold. The main goal of this work was to study this phenomenon for different types of steels and electrolytes. Most mechanisms trying to explain blister formation suggest that hydrogen atoms combine into hydrogen gas molecules at the interfaces such as those between second phase particles and the metal matrix, producing locally high hydrogen pressure inducing microcracks. The propagation and connection of the microcracks causes formation of the blisters and cracks [2].
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
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