Sintering Behavior of Lanthana-Bearing Nanostructured Ferritic Steel Consolidated via Spark Plasma Sintering

Somayeh Pasebani; Indrajit Charit; Darryl P. Butt; James I. Cole; Yaqiao Wu; Jatuporn Burns

doi:10.1002/adem.201500294

Sintering Behavior of Lanthana-Bearing Nanostructured Ferritic Steel Consolidated via Spark Plasma Sintering

Somayeh Pasebani, Indrajit Charit, Darryl P. Butt, James I. Cole, Yaqiao Wu, Jatuporn Burns

Research and Economic Development

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Abstract

Elemental powder mixture of Fe-14Cr-1Ti-0.3Mo-0.5La₂O₃ (wt%) composition is mechanically alloyed for different milling durations (5, 10 and 20 h) and subsequently consolidated via spark plasma sintering under vacuum at 950°C for 7 min. The effects of milling time on the densification behavior and density/microhardness are studied. The sintering activation energy is found to be close to that of grain boundary diffusion. The bimodal grain structure created in the milled and sintered material is found to be a result of milling and not of sintering alone. The oxide particle diameter varies between 2 and 70 nm. Faceted precipitates smaller than 10 nm in diameter are found to be mostly La-Ti-Cr-enriched complex oxides that restrict further recrystallization and related phenomena.

Original language	English
Pages (from-to)	324-332
Number of pages	9
Journal	Advanced Engineering Materials
Volume	18
Issue number	2
DOIs	https://doi.org/10.1002/adem.201500294
State	Published - 1 Feb 2016

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abstract = "Elemental powder mixture of Fe-14Cr-1Ti-0.3Mo-0.5La2O3 (wt%) composition is mechanically alloyed for different milling durations (5, 10 and 20 h) and subsequently consolidated via spark plasma sintering under vacuum at 950°C for 7 min. The effects of milling time on the densification behavior and density/microhardness are studied. The sintering activation energy is found to be close to that of grain boundary diffusion. The bimodal grain structure created in the milled and sintered material is found to be a result of milling and not of sintering alone. The oxide particle diameter varies between 2 and 70 nm. Faceted precipitates smaller than 10 nm in diameter are found to be mostly La-Ti-Cr-enriched complex oxides that restrict further recrystallization and related phenomena.",

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AU - Pasebani, Somayeh

AU - Charit, Indrajit

AU - Butt, Darryl P.

AU - Cole, James I.

AU - Wu, Yaqiao

AU - Burns, Jatuporn

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AB - Elemental powder mixture of Fe-14Cr-1Ti-0.3Mo-0.5La2O3 (wt%) composition is mechanically alloyed for different milling durations (5, 10 and 20 h) and subsequently consolidated via spark plasma sintering under vacuum at 950°C for 7 min. The effects of milling time on the densification behavior and density/microhardness are studied. The sintering activation energy is found to be close to that of grain boundary diffusion. The bimodal grain structure created in the milled and sintered material is found to be a result of milling and not of sintering alone. The oxide particle diameter varies between 2 and 70 nm. Faceted precipitates smaller than 10 nm in diameter are found to be mostly La-Ti-Cr-enriched complex oxides that restrict further recrystallization and related phenomena.

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Sintering Behavior of Lanthana-Bearing Nanostructured Ferritic Steel Consolidated via Spark Plasma Sintering

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