Influence of Dose and Dose Rate Ont the Microstructure of Solution Annealed 316 Steel Irradiated Around 600 °C

Effects of helium content of microstructural development in Type 316 stainless steel under neutron irradiation

“…The matrix in-between sinks became lower in nickel (11.5 wt Z) relative to unirradiated material (see Table 9, p. 97) only at 630°C after 36 dpa. These data support the concepts of "microalloy" formation around sinks due to RIS and agree with LeNaour et al 116 and Brun et al 306 who also find nickel enrichment at voids; these data are also consistent with their suggestion that matrix nickel depletion either accompanies or follows void formation rather than preceding it.…”

“…These concepts directly oppose the "infiltration-exchange'' of M23C6 to make it silicon-and nickel-rich under irradiation, as suggested by Brager and Garner 298 " 300 and others. 116 These data do not support the transformation of M23C6 into M$C either. Although Laves phase in this work evolves compositionally with fluence, as Brager and Garner find, the microstructural changer suggest that the compositional adjustments do not favor Laves stability.…”

“…Next, we examine the quan titative data at ~400 to 700°C. 222 Barton et al, 39 and LeNaour et al 116 The swelling data of Bramman et al 113 and several microstructural data points by Lee et al 223 are also included. Figure 10(a) shows that voids get larger as Irradiation temperature or as fluence Increases.…”

“…301 The data often used to support this correlation are given in Fig. 13 116 and very little sup port from Brun et al 306 Since many researchers find that nickel segregates to voids,116,235,300,30«»-3O7 it is curious that void for mation should correlate spatially with nickel depletion (see Fig. 13).…”

Void-Precipitate Association During Neutron Irradiation of Austenitic Stainless Steel

“…Relative to observations on many other heats of SA 315 irradiated in EBR-II [9,10,[31][32][33][34][35], this 00 heat has far fewer total voids, but a larger fraction of precipitate associated voids. The other heats of steel have, in general, many more loops and higher dislocation concentrations.…”