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Metals 2017, 7(12), 560; https://doi.org/10.3390/met7120560

Fracture Resistance of 14Cr ODS Steel Exposed to a High Temperature Gas

1
Centrum Vyzkumu Rez s.r.o., UJV Group, Rez 130, 250 68 Husinec, Czech Republic
2
CEITEC BUT, Brno University of Technology, Purkynova 123, 616 69 Brno, Czech Republic
3
CEITEC IPM, Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Zizkova 22, 616 62 Brno, Czech Republic
*
Author to whom correspondence should be addressed.
Received: 31 October 2017 / Revised: 4 December 2017 / Accepted: 8 December 2017 / Published: 12 December 2017
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Abstract

This paper studies the impact fracture behavior of the 14%Cr Oxide Dispersion Strengthened (ODS) steel (ODM401) after high temperature exposures in helium and air in comparison to the as-received state. A steel bar was produced by mechanical alloying and hot-extrusion at 1150 °C. Further, it was cut into small specimens, which were consequently exposed to air or 99.9% helium in a furnace at 720 °C for 500 h. Impact energy transition curves are shifted towards higher temperatures after the gas exposures. The transition temperatures of the exposed states significantly increase in comparison to the as-received steel by about 40 °C in He and 60 °C in the air. Differences are discussed in terms of microstructure, surface and subsurface Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM) observations. The embrittlement was explained as temperature and environmental effects resulting in a decrease of dislocation level, slight change of the particle composition and interface/grain boundary segregations, which consequently affected the nucleation of voids leading to the ductile fracture. View Full-Text
Keywords: nanostructured steel; thermal aging; impact fracture; microanalysis; oxidation nanostructured steel; thermal aging; impact fracture; microanalysis; oxidation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Hojna, A.; Michalicka, J.; Hadraba, H.; Di Gabriele, F.; Duchon, J.; Rozumova, L.; Husak, R. Fracture Resistance of 14Cr ODS Steel Exposed to a High Temperature Gas. Metals 2017, 7, 560.

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