Microstructure and fracture toughness characterization of three 9Cr ODS EUROFER steels with different thermo-mechanical treatments

Das, Aniruddh; Chekhonin, P.; Altstadt, E.; McClintock, David; Bergner, F.; Heintze, C.; Lindau, R.

doi:10.1016/j.jnucmat.2020.152464

Microstructure and fracture toughness characterization of three 9Cr ODS EUROFER steels with different thermo-mechanical treatments

Journal Article · Thu Aug 20 04:00:00 EDT 2020 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2020.152464· OSTI ID:1760102

^[1]; Chekhonin, P. ^[2]; ^[2]; ^[3]; Bergner, F. ^[2]; Heintze, C. ^[2]; Lindau, R. ^[4]

Helmholtz-Zentrum Dresden-Rossendorf (Germany); Technische Univ. Dresden (Germany)
Helmholtz-Zentrum Dresden-Rossendorf (Germany)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Karlsruhe Inst. of Technology (KIT) (Germany)

Ferritic martensitic ODS steels are one of the candidate structural materials for future Gen-IV nuclear fission and fusion reactors. Here, the dependence of fracture toughness on microstructure was investigated by comparing three 9Cr ODS EUROFER steels manufactured through different thermo-mechanical processing routes. Quasi-static fracture toughness testing was performed with sub-sized C(T) specimens and microstructural characterization was carried out using scanning electron microscopy, electron backscatter diffraction, and transmission electron microscopy. It was found that at lower test temperatures (-100 – 22 °C), the fracture toughness was primarily controlled by crack initiation at sub-micron particles and by production of secondary cracks during fracture. At higher temperatures (above 100 °C), fracture toughness was predominantly controlled by the matrix ductility and the grain boundary strength with a relatively ductile coarse-grained alloy demonstrating higher fracture toughness compared to high-strength fine-grained alloys. These results and discussion show that variations in thermomechanical treatments can produce significant differences in microstructure and fracture toughness behavior of ferritic martensitic ODS steels.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1760102

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Vol. 542; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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