Dual ion irradiation of commercial and advanced alloys: Evaluating microstructural resistance for high dose core internals

JOURNAL OF NUCLEAR MATERIALS

卷:516

Article

Lear, C. R.¹  Song, M.¹  Wang, M.¹  Was, G. S.¹ 

[1] Univ Michigan, Nucl Engn & Radiol Sci, 2355 Bonisteel Blvd, Ann Arbor, MI 48109 USA

关键词: Radiation damage;    Structural materials;    Swelling;   

DOI  :  10.1016/j.jnucmat.2019.01.014

来源: Elsevier

【 摘 要 】

Ten alloys including austenitic stainless steels 316L and 310; Ni-base alloys X750, 718, 725, 690, 625, and C22; and advanced ferritic alloys T92 (optimized) and 14YWT were irradiated in dual ion mode at 400 degrees C with similar to 5 MeV self-ions to a damage level of 150 dpa and with degraded 2 MeV helium to a concentration of similar to 13 appm He/dpa. Irradiation-induced dislocation loops and nanoscale cavities were observed across the alloys, but with only modest swelling. Pre-existing gamma' and gamma '' precipitates were dissolved or chemically disordered by irradiation, while irradiation-induced phases (e.g., Ni2Cr, G-phase) did not form. In terms of microstructural change, the ferritic alloys, as a class, showed the best radiation resistance while the austenitic stainless steels showed the worst. Radiation resistance among the Ni-base alloys varied significantly, with precipitation-hardened alloys performing worse and dislocation loop content increasing with iron content. These findings were in broad agreement, qualitatively and quantitatively, with past dual beam and in-reactor irradiations of structural materials, demonstrating the utility of dual ion irradiations to capture key evolution quickly and accurately. (C) 2019 Elsevier B.V. All rights reserved.

【 授权许可】

Free