The mechanistic implications of the high temperature, long time thermal stability of nanoscale Mn-Ni-Si precipitates in irradiated reactor pressure vessel steels. (May 2020)

• Record Type: Journal Article
• Authors: Almirall, N.; Wells, P.B.; Pal, S.; Edmondson, P.D.; Yamamoto, T.; Murakami, K.; Odette, G.R.
• Is Part Of: Scripta materialia. Number 181(2020)
• Page Start: 134
• Page End: 139
• Publication Date: 2020-05
• Subjects: Radiation damage -- Atom probe tomography -- Precipitation -- Irradiation embrittlement -- Reactor pressure vessel steels; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.02.027
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: 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 Fe 2+ ions at two temperatures to generate MNSPs with average radii ( r ¯ ) 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. Graphical abstract: Image, graphical abstract