Effect of heavy ion irradiation on microstructural evolution in CF8 cast austenitic stainless steel

Chen, Wei-Ying; Li, Meimei; Kirk, Marquis A.; Baldo, Peter M.; Lian, Tiangan

doi:10.1016/j.jnucmat.2015.08.032

Title: Effect of heavy ion irradiation on microstructural evolution in CF8 cast austenitic stainless steel

Journal Article · Fri Aug 21 00:00:00 EDT 2015 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2015.08.032· OSTI ID:1339086

^[1]; Li, Meimei ^[1]; Kirk, Marquis A. ^[1]; Baldo, Peter M. ^[1]; Lian, Tiangan ^[2]

Argonne National Lab. (ANL), Argonne, IL (United States)
Electric Power Research Inst., Palo Alto, CA (United States)

The microstructural evolution in ferrite and austenitic in cast austenitic stainless steel (CASS) CF8, as received or thermally aged at 400 °C for 10,000 h, was followed under TEM with in situ irradiation of 1 MeV Kr ions at 300 and 350 °C to a fluence of 1.9 × 10¹⁵ ions/cm² (~3 dpa) at the IVEM-Tandem Facility. For the unaged CF8, the irradiation-induced dislocation loops appeared at a much lower dose in the austenite than in the ferrite. At the end dose, the austenite formed a well-developed dislocation network microstructure, while the ferrite exhibited an extended dislocation structure as line segments. Compared to the unaged CF8, the aged specimen appeared to have lower rate of damage accumulation. The rate of microstructural evolution under irradiation in the ferrite was significantly lower in the aged specimen than in the unaged. Finally, we attributed this difference to the different initial microstructures in the unaged and aged specimens, which implies that thermal aging and irradiation are not independent but interconnected damage processes.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1339086

Alternate ID(s):: OSTI ID: 1252056

Journal Information:: Journal of Nuclear Materials, Vol. 471, Issue C; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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