A number of studies have been conducted in the past to understand the effect of the steel composition and microstructure on the tendency to lose ductility through hydrogen-induced embrittlement. Although some general rules have been developed to relate the properties of steels with the tendency for hydrogen embrittlement, much needs to be learned on the effect of many alloying elements on the hydrogen embrittlement in steels. The main objective is to conduct fatigue and fracture-toughness property test. Fatigue damage is typically divided into three stages: crack initiation, crack propagation and final failure. These three stages are important in determining the fatigue life of structural components. Fatigue-crack-growth-rate properties are of vital importance for the structural-reliability assessment, when a structural component is subjected to cyclic loading. Fatigue-crack propagation-rate results can be used to predict the crack-growth life of a component.
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