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

Authors

Somayeh Pasebani, University of Idaho
Indrajit Charit, University of Idaho
Darryl P. Butt, Boise State UniversityFollow
James I. Cole, Idaho National Laboratory
Yaqiao Wu, Boise State UniversityFollow
Jatuporn Burns, Boise State UniversityFollow

Document Type

Article

Publication Date

2-2016

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 studies. 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.

Publication Information

Pasebani, Somayeh; Charit, Indrajit; Butt, Darryl P.; Cole, James I.; Wu, Yaqiao; and Burns, Jatuporn. (2016). "Sintering Behavior of Lanthana-Bearing Nanostructured Ferritic Steel Consolidated via Spark Plasma Sintering". Advanced Engineering Materials, 18(2), 324-332. https://doi.org/10.1002/adem.201500294