High temperature microstructural stability and recrystallization mechanisms in 14YWT alloys
Abstract
In-situ neutron diffraction experiments were performed on room temperature compressed 14YWT nanostructured ferritic alloys at 1100°C and 1150°C to understand their thermally activated static recrystallization mechanisms. The existence of high density of Y-Ti-O rich nano-oxides (<5 nm) shift the recrystallization temperature up due to Zener pinning of the grain boundaries, making these materials attractive for high temperature applications. This study serves to quantify the texture evolution in-situ and understand the effect of particles on the recrystallization mechanisms in 14YWT alloys. We have shown, both experimentally and theoretically, that there is considerable recovery in the 20% compressed sample after 6.5 h annealing at 1100°C while recrystallization occurs within an hour of annealing at 1100°C and 1150°C in the 60% compressed samples. Moreover, the 60% compressed samples show {112}<110> and {112}<111> texture components during annealing, in contrast to the conventional recrystallization textures in body centered cubic alloys. Furthermore, nano-oxide size, shape, density and distribution are considerably different in unrecrystallized and abnormally grown grains. Transmission electron microscopy analysis shows that oxide particles having a size between 5 and 30 nm play a critical role for recrystallization mechanisms in 14YWT nanostructured ferritic alloys.
- Authors:
-
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); JFE Steel Corp., Kurashiki (Japan)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE)
- OSTI Identifier:
- 1422892
- Report Number(s):
- LA-UR-18-20894
Journal ID: ISSN 1359-6454; TRN: US1801666
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 148; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; Nanostructured ferritic alloys; Nano-oxides; Recrystallization; Texture; Neutron diffraction
Citation Formats
Aydogan, E., El-Atwani, O., Takajo, S., Vogel, S. C., and Maloy, S. A. High temperature microstructural stability and recrystallization mechanisms in 14YWT alloys. United States: N. p., 2018.
Web. doi:10.1016/j.actamat.2018.02.006.
Aydogan, E., El-Atwani, O., Takajo, S., Vogel, S. C., & Maloy, S. A. High temperature microstructural stability and recrystallization mechanisms in 14YWT alloys. United States. https://doi.org/10.1016/j.actamat.2018.02.006
Aydogan, E., El-Atwani, O., Takajo, S., Vogel, S. C., and Maloy, S. A. Fri .
"High temperature microstructural stability and recrystallization mechanisms in 14YWT alloys". United States. https://doi.org/10.1016/j.actamat.2018.02.006. https://www.osti.gov/servlets/purl/1422892.
@article{osti_1422892,
title = {High temperature microstructural stability and recrystallization mechanisms in 14YWT alloys},
author = {Aydogan, E. and El-Atwani, O. and Takajo, S. and Vogel, S. C. and Maloy, S. A.},
abstractNote = {In-situ neutron diffraction experiments were performed on room temperature compressed 14YWT nanostructured ferritic alloys at 1100°C and 1150°C to understand their thermally activated static recrystallization mechanisms. The existence of high density of Y-Ti-O rich nano-oxides (<5 nm) shift the recrystallization temperature up due to Zener pinning of the grain boundaries, making these materials attractive for high temperature applications. This study serves to quantify the texture evolution in-situ and understand the effect of particles on the recrystallization mechanisms in 14YWT alloys. We have shown, both experimentally and theoretically, that there is considerable recovery in the 20% compressed sample after 6.5 h annealing at 1100°C while recrystallization occurs within an hour of annealing at 1100°C and 1150°C in the 60% compressed samples. Moreover, the 60% compressed samples show {112}<110> and {112}<111> texture components during annealing, in contrast to the conventional recrystallization textures in body centered cubic alloys. Furthermore, nano-oxide size, shape, density and distribution are considerably different in unrecrystallized and abnormally grown grains. Transmission electron microscopy analysis shows that oxide particles having a size between 5 and 30 nm play a critical role for recrystallization mechanisms in 14YWT nanostructured ferritic alloys.},
doi = {10.1016/j.actamat.2018.02.006},
journal = {Acta Materialia},
number = ,
volume = 148,
place = {United States},
year = {Fri Feb 09 00:00:00 EST 2018},
month = {Fri Feb 09 00:00:00 EST 2018}
}
Web of Science
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