Characterization of nano-sized particles in 14%Cr oxide dispersion strengthened (ODS) steel using classical and frontier microscopy methods

Templeman, Yael; Рогожкин, С. В.; Хомич, А. А.; Nikitin, A. A.; Pinkas, Malki; Meshi, Louisa

doi:10.1016/j.matchar.2019.110075

Cited by 9 publications

(1 citation statement)

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“…Nevertheless, the majority of precipitation‐hardened steels typically features enhanced mechanical properties only at ambient and (slightly) elevated temperatures, i. e. approximately up to the A1 temperature in the iron‐carbon phase diagram [33]. Also by this reason, deliberate introduction of dispersions of fine strengthening oxide nanoparticles can be highly efficient, as such oxide dispersion strengthened steels can maintain their stability up to (very) high temperatures [34].…”

Section: Introductionmentioning

confidence: 99%

Direct consolidation of an oxide dispersion strengthened alloy by hot rotary swaging

Kunčická,

Svoboda

2024

Materialwissenschaft Werkst

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Steels strengthened by alloying elements and precipitates typically maintain their enhanced properties up to the ferrite‐austenite transformation. However, oxide dispersion strengthened ferritic steels are creep resistant even at much higher temperatures given by dispersions of nanosized oxides. To ensure homogeneous dispersion of the oxides, powder metallurgy is used for preparation of the original material. The presented study investigates the effects of direct consolidation of powder of ferritic steel strengthened with yttrium oxide nanoparticles. The powders were mechanically alloyed and sealed into evacuated steel containers, which were subjected to gradual hot consolidation via the industrially applicable intensive plastic deformation method of rotary swaging. Investigations assessing the effects of several reduction ratios showed that the direct consolidation of the oxide dispersion strengthened steel was successful – in the macroscale – at the swaging ratio of 1.03; the quality of consolidation further increased with increasing swaging ratio. At the swaging ratio of 1.83, the consolidated bulk material featured ultra‐fine grains characterized with high angle grain boundaries, homogeneous dispersion of oxide precipitates, and the average Vickers microhardness of 706.6 HV 1.

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Section: Introductionmentioning

confidence: 99%