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

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.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: NA0003525

OSTI ID:: 1872037

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

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

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
MA956
friction stir welding
microstructure
nanoindentation
radiation effects

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