Influences of interstitial and extrusion temperature on grain boundary segregation, Y-Ti-O nanofeatures, and mechanical properties of ferritic steels

Seol, Jae Bok; Haley, Daniel; Hoelzer, David T.; Kim, Jeoung Han

doi:10.1016/j.actamat.2018.04.046

Title: Influences of interstitial and extrusion temperature on grain boundary segregation, Y-Ti-O nanofeatures, and mechanical properties of ferritic steels

Journal Article · 21 April 2018 · Acta Materialia

DOI: https://doi.org/10.1016/j.actamat.2018.04.046 · OSTI ID:1463984

Seol, Jae Bok ^[1]; Haley, Daniel ^[2];

^[3]; Kim, Jeoung Han ^[4]

Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of). National Inst. for Nanomaterials Technology
Univ. of Oxford (United Kingdom). Dept. of Materials
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Hanbat National Univ., Daejeon (Korea, Republic of). Dept. of Materials Science and Engineering

Doping with interstitials influences the grain boundary (GB) composition of metallic alloys, enabling changes in elemental GB enrichment, grain size, and mechanical properties or even promoting nanoparticle formation. Yet, little efforts on these doping effects have been made in oxide dispersion-strengthened (ODS) steels. In this paper, by combining advanced microscopy techniques, we studied the impact of interstitial concentration and extrusion temperature on the GB structure-dependent solute segregation, Y-Ti-O nanofeatures, and mechanical properties of ferritic Fe–14Cr (wt%) ODS steels fabricated by ball milling. We found that doping with high carbon and oxygen contents causes the GB to be decorated with the interstitials and promotes nanoparticle formation along the GBs, thereby retarding capillary-driven grain coarsening. This effect performs twofold, through grain size refinement and particle hardening. For samples with low interstitial contents, altering the extrusion temperature does not significantly change the material's mechanical properties and microstructure or the nonstoichiometric chemistry of nanoparticles, which are highly stable at high temperatures. Finally and further, for all the samples, Y–Al oxides in the initial precipitation stages rapidly become coarsened at high temperatures, as Al weakens the thermal stability of nanoparticles, thereby transforming them to core-shell structures with Y-Al-rich cores and Ti-O-rich shells in the later precipitation stages.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of); Hanbat National Univ., Daejeon (Korea, Republic of)

Sponsoring Organization:: USDOE; National Research Foundation of Korea (NRF); Ministry of Science and ICT (MSIT) (Korea, Republic of); Civil-Military Technology Cooperation Program (Korea, Republic of)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1463984

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 153; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Influences of interstitial and extrusion temperature on grain boundary segregation, Y-Ti-O nanofeatures, and mechanical properties of ferritic steels

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