Friction stir welding and self-ion irradiation effects on microstructure and mechanical properties changes within oxide dispersion strengthened steel $\mathrm{MA956}$

Getto, E.; Johnson, M.; Maughan, M.; Nathan, N.; McMahan, J.; Baker, B.; Knipling, K.; Briggs, S.; Hattar, K.; Swenson, M. J.

doi:10.1016/j.jnucmat.2022.153795

Title: Friction stir welding and self-ion irradiation effects on microstructure and mechanical properties changes within oxide dispersion strengthened steel $$\mathrm{MA956}$$

Journal Article · Tue May 17 00:00:00 EDT 2022 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2022.153795· OSTI ID:1872037

^[1]; Johnson, M. ^[2];

^[2]; Nathan, N. ^[1]; McMahan, J. ^[1];

^[1]; Knipling, K. ^[3];

^[4];

^[5]; Swenson, M. J. ^[2]

US Naval Academy, Annapolis, MD (United States)
University of Idaho, Moscow, ID (United States)
Naval Research Lab. (NRL), Washington, DC (United States)
Oregon State University, Corvallis, OR (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

We report the joining process for oxide dispersion strengthened (ODS) alloys remains a key challenge facing the nuclear community. The microstructure and mechanical properties were characterized in the base material and friction stir welded ODS MA956 irradiated with 5 MeV Fe²⁺ ions from 400 to 500°C up to 25 dpa. Nanoindentation was performed to assess changes in hardness and yield stress, and the dispersed barrier hardening (DBH) model was applied to described results. A combination of scanning transmission electron microscopy (STEM) and atom probe tomography (APT) were used to assess evolution of the microstructure including dispersoids, network dislocations and dislocation loops, nanoclusters, and solid solution concentrations. Overall, softening was observed as a result of increased dose, which was exacerbated at 500°C. The formation and coarsening of new dispersoids was noted while nanoclusters tended to dissolve in the base material, and were not observed in the stir zone. Solute nanocluster evolution was identified as a primary driver of the changes in mechanical properties.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); Defense Threat Reduction Agency (DTRA); Army Research Laboratories

Grant/Contract Number:: NA0003525; HDTRA113691

OSTI ID:: 1872037

Report Number(s):: SAND2022-7014J; 706695; TRN: US2307121

Journal Information:: Journal of Nuclear Materials, Vol. 567; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Friction stir welding and self-ion irradiation effects on microstructure and mechanical properties changes within oxide dispersion strengthened steel $$\mathrm{MA956}$$

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