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Cavity Evolution and Void Swelling in Dual Ion Irradiated Tempered Martensitic Steels by Takuya Yamamoto; Yuan Wu; Kiyohiro Yabuuchi; Jack Haley; Kenta Yoshida; Akihiko Kimura; G. Robert Odette is a Materials Science article available to read on EtoBox.

What is Cavity Evolution and Void Swelling in Dual Ion Irradiated Tempered Martensitic Steels about?

Microstructural evolutions in two variants of the F82H 8 wt%Cr tempered martensitic steel under dual (He+ plus Fe3+) ion irradiations at 500 °C have been characterized by transmission electron microscopy. Emphasis is on understanding the combined effects of displacements per atom (dpa) and the helium/dpa ratio (He/dpa) on cavity evolution and void swelling (fv). The dual ion database includes 231 alloy-dpa-He/dpa conditions for irradiations up to ∼ 82 dpa and 3700 appm helium. We hypothesize that the large “scatter” observed in the fv data is primarily due to local microstructural variations, especially those that shield regions at shallower depths from the effects of injected interstitial atoms, which would otherwise reduce fv. More generally, our hypothesis is that the highest fv data, at a specified dpa and He/dpa, provides the most appropriate estimate of swelling for fusion neutron irradiation conditions. The dose dependence of fv can be described by an incubation dpai, marking the onset of significant void growth, and a post-incubation swelling rate, fv’ = Δfv/Δdpa. Both dpai and fv’ decrease with increasing He/dpa. The fv’ data are quantitatively consistent with a simple mod

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Author

Takuya Yamamoto; Yuan Wu; Kiyohiro Yabuuchi; Jack Haley; Kenta Yoshida; Akihiko Kimura; G. Robert Odette

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Materials Science (Physical Sciences)