| Abstract: | Feasibility of early detection of hydrogen in metals by acoustic emission analysis Acoustic emission measurements are performed with the steels Ck 35 and 35 NCD 16. In function of the tensile strength tensile specimens are charged electrochemically with hydrogen. It is shown, that even in the charging phase acoustic emission signals can be registered. Especially during the repeated tensile test with hydrogen-charged specimens material damages can be detected with acoustic emission. In this case the well-known Kaiser effect in acoustic emission is omitted. The effect of the absorbed hydrogen is documented by changes of the mechanical properties of the material and by microfractographic investigations. |
