High-energy electron irradiation on a modified 316 austenitic stainless steel and its model alloys, Fe-Cr-Ni, Fe-Cr-Ni-Ti and Fe-Cr-Ni-Si. and a ferritic steel has been performed with a high-voltage electron microscope. Interstitial-type dislocation loops are formed in all alloys. Comparisons of the nucleation and the growth rate of interstitial loops among four austenitic steels suggests strong interaction between the titanium atoms and vacancies and between the silicon atoms and interstitials. The effect of pre-heat treatment above 600°C on the loop nucleation during lower-temperature irradiation has been found, especially near the specimen surface. In ferritic steel, the nucleation of interstitial loops occurs continuously during steady-state irradiation, where the dynamically-balanced state of point defects is established. This difference from pure metals, in general, is attributed to the smaller difference of mobilities between vacancies and interstitials in the steel than that in pure metals.
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Materials Science(all)
- Nuclear Energy and Engineering