Microstructural and micro-mechanical analysis of 14YWT nanostructured Ferritic alloy after varying thermo-mechanical processing paths into tubing
Abstract
Microstructural analyses and micro-pillar compression were conducted on 14YWT nanostructured ferritic alloy (NFA) to compare different processing pathways: hydrostatic extrusion and Pilger processing with varying annealing temperatures into thin walled tubing, and after hot extrusion and cross-rolling into a plate. Hydrostatic extrusion at 815 °C resulted in the smallest grain sizes and highest yield strength of 1.20 GPa. Pilger processing with annealing at 800 °C had fine grained regions and bands of coarse grains, leading to a large variation in yield strength of 0.9–1.40 GPa. Higher annealing temperatures of 1200 °C after pilger processing significantly increased the grain size and lowered the yield strength to 1.01 GPa. These tubes showed a stronger (111) crystallographic texture in the normal direction and elongated grains in the extrusion direction. Characterization of the nano-oxides using TEM reveals more numerous, smaller oxides present in tubing processed at lower temperatures. Overall, this work shows NFA tubing after hydrostatic extrusion and pilger processing can lead to fine grained microstructures and texturing leading to higher yield strengths at lower annealing temperatures (e.g. 800 °C).
- Authors:
-
[2];
[2];
[2];
- Univ. of Nevada, Reno, NV (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Univ. Paris-Saclay, Gif-sur-Yvette (France)
- Case Western Reserve Univ., Cleveland, OH (United States)
- Iowa State Univ., Ames, IA (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1716824
- Alternate Identifier(s):
- OSTI ID: 1778603
- Report Number(s):
- LA-UR-20-24731
Journal ID: ISSN 1044-5803
- Grant/Contract Number:
- 89233218CNA000001; MRI-1726897; CMMI-1841331; NE0008739
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Materials Characterization
- Additional Journal Information:
- Journal Volume: 171; Journal Issue: C; Journal ID: ISSN 1044-5803
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; ODS; 14YWT; Oxide particles; Micro-pillar
Citation Formats
Harvey, Cayla Renee, El Atwani, Osman, Kim, Hyosim, Lavender, Curt, McCoy, Marie, Sornin, Denis, Lewandowski, John, Maloy, Stuart Andrew, and Pathak, Siddhartha. Microstructural and micro-mechanical analysis of 14YWT nanostructured Ferritic alloy after varying thermo-mechanical processing paths into tubing. United States: N. p., 2020.
Web. doi:10.1016/j.matchar.2020.110744.
Harvey, Cayla Renee, El Atwani, Osman, Kim, Hyosim, Lavender, Curt, McCoy, Marie, Sornin, Denis, Lewandowski, John, Maloy, Stuart Andrew, & Pathak, Siddhartha. Microstructural and micro-mechanical analysis of 14YWT nanostructured Ferritic alloy after varying thermo-mechanical processing paths into tubing. United States. https://doi.org/10.1016/j.matchar.2020.110744
Harvey, Cayla Renee, El Atwani, Osman, Kim, Hyosim, Lavender, Curt, McCoy, Marie, Sornin, Denis, Lewandowski, John, Maloy, Stuart Andrew, and Pathak, Siddhartha. Thu .
"Microstructural and micro-mechanical analysis of 14YWT nanostructured Ferritic alloy after varying thermo-mechanical processing paths into tubing". United States. https://doi.org/10.1016/j.matchar.2020.110744. https://www.osti.gov/servlets/purl/1716824.
@article{osti_1716824,
title = {Microstructural and micro-mechanical analysis of 14YWT nanostructured Ferritic alloy after varying thermo-mechanical processing paths into tubing},
author = {Harvey, Cayla Renee and El Atwani, Osman and Kim, Hyosim and Lavender, Curt and McCoy, Marie and Sornin, Denis and Lewandowski, John and Maloy, Stuart Andrew and Pathak, Siddhartha},
abstractNote = {Microstructural analyses and micro-pillar compression were conducted on 14YWT nanostructured ferritic alloy (NFA) to compare different processing pathways: hydrostatic extrusion and Pilger processing with varying annealing temperatures into thin walled tubing, and after hot extrusion and cross-rolling into a plate. Hydrostatic extrusion at 815 °C resulted in the smallest grain sizes and highest yield strength of 1.20 GPa. Pilger processing with annealing at 800 °C had fine grained regions and bands of coarse grains, leading to a large variation in yield strength of 0.9–1.40 GPa. Higher annealing temperatures of 1200 °C after pilger processing significantly increased the grain size and lowered the yield strength to 1.01 GPa. These tubes showed a stronger (111) crystallographic texture in the normal direction and elongated grains in the extrusion direction. Characterization of the nano-oxides using TEM reveals more numerous, smaller oxides present in tubing processed at lower temperatures. Overall, this work shows NFA tubing after hydrostatic extrusion and pilger processing can lead to fine grained microstructures and texturing leading to higher yield strengths at lower annealing temperatures (e.g. 800 °C).},
doi = {10.1016/j.matchar.2020.110744},
journal = {Materials Characterization},
number = C,
volume = 171,
place = {United States},
year = {Thu Nov 05 00:00:00 EST 2020},
month = {Thu Nov 05 00:00:00 EST 2020}
}
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