Irradiation creep and precipitation in a ferritic ODS steel under helium implantation

Irradiation creep and microstructural changes in an advanced ODS ferritic steel during helium implantation under stress

“…Each stress change caused, aside from elastic strain, also a short transient stage before stationary creep was reached again. Those transient strains are similar to observations in PM2000 [7] and are ascribed to irradiation-induced relaxation. According to the results from PM2000 [7], it is assumed that thermal creep is negligible even at 773 K. Irradiation-induced creep rates, e 0 i.e.…”

“…Those transient strains are similar to observations in PM2000 [7] and are ascribed to irradiation-induced relaxation. According to the results from PM2000 [7], it is assumed that thermal creep is negligible even at 773 K. Irradiation-induced creep rates, e 0 i.e. strain-rate per dose-rate (in unit of dpa À1 ) were obtained by fitting straight lines to the stationary parts of the curves in Fig.…”

“…The resistivity changes of K1 in Fig. 4 at 557 K as well as 773 K are quite similar to those obtained for PM2000 [7].…”

“…On the other hand, studies on irradiation effects in general are still very limited and especially irradiation creep data are almost completely missing. Recently, irradiation creep [7] and related microstructural changes [8] of an industrially produced ODS steel (PM2000) [9] have been reported. As advanced 19Cr ODS steels, for example the newly developed type K1 of Kyoto University have much smaller ODS particles, it was the aim of the present work to investigate the effects of oxide particle size on irradiation creep and microstructural changes under irradiation.…”

Characterization of Irradiation Damage of Ferritic ODS Alloys with Advanced Micro-Sample Methods

“…Irradiation was performed with 24 MeV 4 He ++ ions passing through a magnet scanning system and a degrader wheel with 24 Alfoils of variable thicknesses. More details about the experimental conditions can be found in literature [7].…”