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Title: Microstructure and property tailoring of castable nanostructured alloys through thermomechanical treatments

Three types of microstructures, i.e., tempered-martensite (TM), ferrite (F), and dual-phase (TM + F), were developed in a castable nanostructured alloy that favors a high density of nanoprecipitates compared with the precipitates in current reduced-activation ferritic-martensitic steels. The effect of the distinct microstructures on tensile properties, Charpy impact toughness, and thermal helium desorption behavior was investigated with the full TM structure as a reference. The results indicated that the F domain in the TM + F structure governed the strength and slightly impaired the impact toughness. The full F structure exhibited the highest strength without compromising ductility, but it noticeably diminished impact toughness. All microstructures had a dominant helium desorption peak at ~1070 °C. The higher density of nanoprecipitates and complex boundaries and dislocations in the TM + F structure enhanced the secondary helium desorption peak and extended the shoulder peak, in contrast to the full TM structure with an enlarged desorption peak associated with the ferrite-to-austenite transformation at ~810–850 °C and the full F structure with a dominant desorption peak related to bubble migration at ~1070 °C. These results suggest that components fabricated from functionally graded microstructures could be engineered to exploit the advantages of different microstructures for demandingmore » application requirements.« less
Authors:
ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 509; 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), Fusion Energy Sciences (FES) (SC-24); USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1460207

Tan, Lizhen, Parish, Chad M., and Hu, Xunxiang. Microstructure and property tailoring of castable nanostructured alloys through thermomechanical treatments. United States: N. p., Web. doi:10.1016/j.jnucmat.2018.07.012.
Tan, Lizhen, Parish, Chad M., & Hu, Xunxiang. Microstructure and property tailoring of castable nanostructured alloys through thermomechanical treatments. United States. doi:10.1016/j.jnucmat.2018.07.012.
Tan, Lizhen, Parish, Chad M., and Hu, Xunxiang. 2018. "Microstructure and property tailoring of castable nanostructured alloys through thermomechanical treatments". United States. doi:10.1016/j.jnucmat.2018.07.012.
@article{osti_1460207,
title = {Microstructure and property tailoring of castable nanostructured alloys through thermomechanical treatments},
author = {Tan, Lizhen and Parish, Chad M. and Hu, Xunxiang},
abstractNote = {Three types of microstructures, i.e., tempered-martensite (TM), ferrite (F), and dual-phase (TM + F), were developed in a castable nanostructured alloy that favors a high density of nanoprecipitates compared with the precipitates in current reduced-activation ferritic-martensitic steels. The effect of the distinct microstructures on tensile properties, Charpy impact toughness, and thermal helium desorption behavior was investigated with the full TM structure as a reference. The results indicated that the F domain in the TM + F structure governed the strength and slightly impaired the impact toughness. The full F structure exhibited the highest strength without compromising ductility, but it noticeably diminished impact toughness. All microstructures had a dominant helium desorption peak at ~1070 °C. The higher density of nanoprecipitates and complex boundaries and dislocations in the TM + F structure enhanced the secondary helium desorption peak and extended the shoulder peak, in contrast to the full TM structure with an enlarged desorption peak associated with the ferrite-to-austenite transformation at ~810–850 °C and the full F structure with a dominant desorption peak related to bubble migration at ~1070 °C. These results suggest that components fabricated from functionally graded microstructures could be engineered to exploit the advantages of different microstructures for demanding application requirements.},
doi = {10.1016/j.jnucmat.2018.07.012},
journal = {Journal of Nuclear Materials},
number = C,
volume = 509,
place = {United States},
year = {2018},
month = {7}
}