MECHANICAL AND STRUCTURAL BEHAVIOUR OF X 65 CONTINUOUS CASTING STEEL UNDER HYDROGEN EMBRITTLEMENT INFLUENCE
Abstract
The paper presents experimental results of the mechanical tests (alternating plane bending and Charpy impact) performed on samples obtained from X 65 PSL 2 steel slabs. Samples were taken from different batches, cast at the same continuous casting machine. Since metallographic analyses indicates a heterogeneous micro and macrostructure, the samples were collected from different areas of the slabs (surface and middle).
In order to highlight the influence of hydrogen embrittlement on mechanical characteristics of steel, some specimens were hydrogenated into hydrogen sulphide environment, for different periods of time. There were calculated the hydrogen embrittlement degree and the structural heterogeneity degree of the slabs structure with data from the two types of the mentioned tests. It is found that the hydrogen embrittlement mainly influences the fatigue characteristics. The structural differences between surface and middle of the slabs are mainly highlighted by the impact tests.
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