Precipitation kinetics of ferritic / martensitic oxide dispersion strengthened steels: Influence of the matrix phase transformation
Source abstract
Abstract
ODS steels are candidate materials for the future generation of nuclear power plants. Ferritic / Martensitic (F/M) ODS steels display better formability thanks to high temperature austenitic transformation. The precipitation kinetics of a F/M Fe-9Cr ODS steel had been characterized by in-situ Small Angle X-ray Scattering (SAXS). The influence of the matrix phase transformation has been established, with an increase of the growth rate of the nano-oxides in austenite, leading to nano-oxides ~ 2x larger than in Fe-14Cr ferritic ODS grades at the end of the thermal treatment. Moreover, the APT volume after a heating ramp up to 1100 °C displayed three grains, two likely corresponding to non-transformed ferrite and one to martensite (transformed from austenite), identified thanks to their C content. In the untransformed ferrite domain, the nano-oxides number density was found to be very similar to the Fe-14Cr grade, and significantly higher than the martensitic grain. Anomalous SAXS as well as comparison between Atom Probe Tomography (APT) and SAXS provided evidences that the nano-oxides stabilize with a Y2Ti2O7 or Y2TiO5 stoichiometry around 1100 °C.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Fusion materials and technologies · Hydrogen embrittlement and corrosion behaviors in metals · Nuclear Materials and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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