Testování mechanických vlastností Inconelu 713 a 738 pro pokročilé reaktory

Nickel superalloys Inconel 713 and 738 belong among metallic construction materials used for components of advances gas cooled reactors. The project of applied research solved by the UCT Prague and RC Řež tested mechanical properties of these alloys in the starting phase and after the exposure to helium containing trace pollutants (CO, H₂, CH₄, H₂O) at the temperature of 900°C for a period of 1000 hours. The samples of tested alloys were made from: a) the virgin cast material, b) remanufactured material (revert 100R) and c) casting of previous materials in the ratio of 50V/50R. To identify mechanical properties of the materials after exposure, tensile tests and structural analyses by SEM were carried out. The changes of properties after the exposure of tested alloys and the same alloys made in various procedures were compared. While the yield and tensile strengths dropped insignificantly for Inconel 713, the plummeted for Inconel 738. The 50V/50R state showed better mechanical properties than the revert 100R state.