scholarly journals The mechanistic implications of the high temperature, long time thermal stability of nanoscale Mn-Ni-Si precipitates in irradiated reactor pressure vessel steels

2020 ◽  
Vol 181 ◽  
pp. 134-139 ◽  
Author(s):  
N. Almirall ◽  
P.B. Wells ◽  
S. Pal ◽  
P.D. Edmondson ◽  
T. Yamamoto ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Pressure Vessel ◽  
Reactor Pressure Vessel ◽  
Pressure Vessel Steels ◽  
Long Time ◽  
Thermal Stability Of ◽  
Reactor Pressure

scholarly journals The mechanistic implications of the high temperature, long time thermal stability of nanoscale Mn-Ni-Si precipitates in irradiated reactor pressure vessel steels (link in doc)

2020 ◽  
Author(s):  
Nathan Almirall ◽  
Peter Wells ◽  
Soupitak Pal ◽  
Philip Edmondson ◽  
Takuya Yamamoto ◽  
...  
Keyword(s):  
High Temperature ◽  
Pressure Vessel ◽  
Atom Probe ◽  
X Ray ◽  
Pressure Vessel Steels ◽  
Long Time ◽  
Radiation Induced ◽  
Two Temperatures ◽  
Thermal Stability Of ◽  
Reactor Pressure

Post irradiation annealing (PIA) clarified the induced versus enhanced controversy regarding nanoscale Mn-Ni-Si precipitate (MNSP) formation in pressure vessel steels. Radiation induced MNSPs would dissolve under high temperature PIA, while radiation enhanced precipitates would be stable above a critical radius (rc). A Cu-free, high Ni steel was irradiated with 2.8MeV Fe2+ ions at two temperatures to generate MNSPs with average radii () above and below an estimated rc for PIA at 425°C up to 52 weeks. Atom probe tomography and energy dispersive x-ray spectroscopy showed MNSPs with r < rc dissolved, while those with r > rc slightly coarsened, consistent with thermodynamic predictions.

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