Microstructural and micro-mechanical analysis of 14YWT nanostructured Ferritic alloy after varying thermo-mechanical processing paths into tubing

Harvey, Cayla Renee; El Atwani, Osman; Kim, Hyosim; Lavender, Curt; McCoy, Marie; Sornin, Denis; Lewandowski, John; Maloy, Stuart Andrew; Pathak, Siddhartha

doi:10.1016/j.matchar.2020.110744

Title: Microstructural and micro-mechanical analysis of 14YWT nanostructured Ferritic alloy after varying thermo-mechanical processing paths into tubing

Journal Article · Thu Nov 05 00:00:00 EST 2020 · Materials Characterization

DOI:https://doi.org/10.1016/j.matchar.2020.110744· OSTI ID:1716824

Harvey, Cayla Renee ^[1];

^[2];

^[2]; Lavender, Curt ^[3]; McCoy, Marie ^[3]; Sornin, Denis ^[4]; Lewandowski, John ^[5];

^[2]; Pathak, Siddhartha ^[6]

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)

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).

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001; MRI-1726897; CMMI-1841331; NE0008739

OSTI ID:: 1716824

Alternate ID(s):: OSTI ID: 1778603

Report Number(s):: LA-UR-20-24731

Journal Information:: Materials Characterization, Vol. 171, Issue C; ISSN 1044-5803

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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