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Title: Effect of High-Density Nanoparticles on Recrystallization and Texture Evolution in Ferritic Alloys

Ferritic alloys are important for nuclear reactor applications due to their microstructural stability, corrosion resistance, and favorable mechanical properties. Nanostructured ferritic alloys having a high density of Y-Ti-O rich nano-oxides (NOs < 5 nm) are found to be extremely stable at high temperatures up to ~1100 °C. This study serves to understand the effect of a high density of nano-particles on texture evolution and recrystallization mechanisms in ferritic alloys of 14YWT (14Cr-3W-0.4Ti-0.21Y-Fe wt %) having a high density of nano-particles and dispersion-free FeCrAl (13Cr-5.2Al-0.05Y-2Mo-0.2Si-1Nb wt %). In order to investigate the recrystallization mechanisms in these alloys, neutron diffraction, electron backscattered diffraction, and in situ and ex situ transmission electron microscopy have been utilized. Here it has been observed that even though the deformation textures of both the 14YWT and FeCrAl alloys evolved similarly, resulting in either the formation (in FeCrAl alloy) or increase (in 14YWT) in γ-fiber texture, the texture evolution during recrystallization is different. While FeCrAl alloy keeps its γ-fiber texture after recrystallization, 14YWT samples develop a ε-fiber as a result of annealing at 1100 °C, which can be attributed to the existence of NOs. In situ transmission electron microscopy annealing experiments on 14YWT show the combination and growthmore » of the lamellar grains rather than nucleation; however, the recrystallization and growth kinetics are slower due to NOs compared to FeCrAl.« less
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Sabanci Univ., Istanbul (Turkey)
  2. Colorado School of Mines, Golden, CO (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Argonne National Lab. (ANL), Lemont, IL (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Crystals
Additional Journal Information:
Journal Volume: 9; Journal Issue: 3; Journal ID: ISSN 2073-4352
Publisher:
MDPI
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; FeCrAl alloys; nano-oxides (NOs); nano-structured ferritic alloys (NFAs); neutron diffraction; recrystallization; texture
OSTI Identifier:
1503640

Aydogan, Eda, Rietema, Connor J., Carvaja-Nunez, Ursula, Vogel, Sven C., Li, Meimei, and Maloy, Stuart A.. Effect of High-Density Nanoparticles on Recrystallization and Texture Evolution in Ferritic Alloys. United States: N. p., Web. doi:10.3390/cryst9030172.
Aydogan, Eda, Rietema, Connor J., Carvaja-Nunez, Ursula, Vogel, Sven C., Li, Meimei, & Maloy, Stuart A.. Effect of High-Density Nanoparticles on Recrystallization and Texture Evolution in Ferritic Alloys. United States. doi:10.3390/cryst9030172.
Aydogan, Eda, Rietema, Connor J., Carvaja-Nunez, Ursula, Vogel, Sven C., Li, Meimei, and Maloy, Stuart A.. 2019. "Effect of High-Density Nanoparticles on Recrystallization and Texture Evolution in Ferritic Alloys". United States. doi:10.3390/cryst9030172. https://www.osti.gov/servlets/purl/1503640.
@article{osti_1503640,
title = {Effect of High-Density Nanoparticles on Recrystallization and Texture Evolution in Ferritic Alloys},
author = {Aydogan, Eda and Rietema, Connor J. and Carvaja-Nunez, Ursula and Vogel, Sven C. and Li, Meimei and Maloy, Stuart A.},
abstractNote = {Ferritic alloys are important for nuclear reactor applications due to their microstructural stability, corrosion resistance, and favorable mechanical properties. Nanostructured ferritic alloys having a high density of Y-Ti-O rich nano-oxides (NOs < 5 nm) are found to be extremely stable at high temperatures up to ~1100 °C. This study serves to understand the effect of a high density of nano-particles on texture evolution and recrystallization mechanisms in ferritic alloys of 14YWT (14Cr-3W-0.4Ti-0.21Y-Fe wt %) having a high density of nano-particles and dispersion-free FeCrAl (13Cr-5.2Al-0.05Y-2Mo-0.2Si-1Nb wt %). In order to investigate the recrystallization mechanisms in these alloys, neutron diffraction, electron backscattered diffraction, and in situ and ex situ transmission electron microscopy have been utilized. Here it has been observed that even though the deformation textures of both the 14YWT and FeCrAl alloys evolved similarly, resulting in either the formation (in FeCrAl alloy) or increase (in 14YWT) in γ-fiber texture, the texture evolution during recrystallization is different. While FeCrAl alloy keeps its γ-fiber texture after recrystallization, 14YWT samples develop a ε-fiber as a result of annealing at 1100 °C, which can be attributed to the existence of NOs. In situ transmission electron microscopy annealing experiments on 14YWT show the combination and growth of the lamellar grains rather than nucleation; however, the recrystallization and growth kinetics are slower due to NOs compared to FeCrAl.},
doi = {10.3390/cryst9030172},
journal = {Crystals},
number = 3,
volume = 9,
place = {United States},
year = {2019},
month = {3}
}

Works referenced in this record:

Recent Developments in Irradiation-Resistant Steels
journal, August 2008

Influence of particle dispersions on the high-temperature strength of ferritic alloys
journal, August 2007

Kinetics of Phase Change. I General Theory
journal, December 1939
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