Fracture Resistance of 14Cr ODS Steel Exposed to a High Temperature Gas
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Date
2017-12-01
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Mark
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MDPI
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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.
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Peer-reviewed
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en