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Title: Development of castable nanostructured alloys as a new generation RAFM steels

Castable nanostructured alloys (CNAs) are being developed as a new generation of reduced-activation ferritic-martensitic (RAFM) steels to overcome certain limitations of the current RAFM steels, such as their narrow operating temperature range and associated low strength at high temperatures. Six CNAs were developed and examined, exhibiting noticeably increased yield strength, tensile strength and creep resistance as compared to the current RAFM steels, which are comparable to ODS-Eurofer (0.3% Y 2O 3) at 650 °C. The enhanced strength of CNAs is also associated with a beneficial increase in Charpy impact upper-shelf energies, up to ~2.5 times that of the current RAFM steels, with comparable ductile-brittle transition temperatures. Furthermore, a broad analysis of microstructure, alloy chemistry and grain size analyses clearly support the mechanisms that explain the mechanical property improvements of these CNAs, providing essential insight for further development of advanced RAFM steels to meet the challenges of future fusion reactors.
Authors:
ORCiD logo [1] ; ORCiD logo [1] ;  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Stony Brook Univ., Stony Brook, NY (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 511; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Tensile; Creep; Charpy; Nanoprecipitates; Sink strength
OSTI Identifier:
1479784

Tan, Lizhen, Katoh, Yutai, and Snead, Lance L. Development of castable nanostructured alloys as a new generation RAFM steels. United States: N. p., Web. doi:10.1016/j.jnucmat.2018.05.024.
Tan, Lizhen, Katoh, Yutai, & Snead, Lance L. Development of castable nanostructured alloys as a new generation RAFM steels. United States. doi:10.1016/j.jnucmat.2018.05.024.
Tan, Lizhen, Katoh, Yutai, and Snead, Lance L. 2018. "Development of castable nanostructured alloys as a new generation RAFM steels". United States. doi:10.1016/j.jnucmat.2018.05.024.
@article{osti_1479784,
title = {Development of castable nanostructured alloys as a new generation RAFM steels},
author = {Tan, Lizhen and Katoh, Yutai and Snead, Lance L.},
abstractNote = {Castable nanostructured alloys (CNAs) are being developed as a new generation of reduced-activation ferritic-martensitic (RAFM) steels to overcome certain limitations of the current RAFM steels, such as their narrow operating temperature range and associated low strength at high temperatures. Six CNAs were developed and examined, exhibiting noticeably increased yield strength, tensile strength and creep resistance as compared to the current RAFM steels, which are comparable to ODS-Eurofer (0.3% Y2O3) at 650 °C. The enhanced strength of CNAs is also associated with a beneficial increase in Charpy impact upper-shelf energies, up to ~2.5 times that of the current RAFM steels, with comparable ductile-brittle transition temperatures. Furthermore, a broad analysis of microstructure, alloy chemistry and grain size analyses clearly support the mechanisms that explain the mechanical property improvements of these CNAs, providing essential insight for further development of advanced RAFM steels to meet the challenges of future fusion reactors.},
doi = {10.1016/j.jnucmat.2018.05.024},
journal = {Journal of Nuclear Materials},
number = C,
volume = 511,
place = {United States},
year = {2018},
month = {5}
}