IRRADIATION CREEP AND SWELLING FROM 400°C TO 600°C OF THE OXIDE DISPERSION STRENGTHENED FERRITIC ALLOY MA957

摘要

Recently, there has been a growing interest in the use of oxide dispersion strengthened (ODS) ferritic steels for fusion reactor first wall applications. This presentation will show the results of an irradiation creep and swelling study performed on the Y_2O_3 strengthened ODS ferritic steel MA957. Pressurized tubes were irradiated in the Fast Flux Test Facility (FFTF) to doses ranging from 40 dpa to 110 dpa at temperatures ranging from 400°C to 600°C. None of the stress-free tubes exhibited any evidence of swelling as determined by diameter change measurements. The observed irradiation creep behavior was different than previously observed irradiation creep behavior in conventional ferritic-martensitic steels and austenitic stainless steels. The behavior may be due in-part to the method used to manufacture this steel.