Journal
SCRIPTA MATERIALIA
Volume 199, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2021.113888
Keywords
Additive manufacturing; Grade 91 steel; Creep; Stress-strain; Grain boundaries; Thermal stability
Categories
Funding
- Los Alamos National Laboratory Research and Development Program
- DOE-NE's Microreactor program
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AM-Grade 91 steel shows high strength, ductility, and enhanced creep resistance at high temperatures compared to wrought Grade 91 steel. However, the complex microstructure of this steel may increase the ductile-to-brittle transition temperature.
High temperature stability of the mechanical properties, including creep behavior, are important factors to consider in certifying additive manufactured (AM) steels for reactor operation. AM-Grade 91 steel, tested at RT is shown to possess high yield strength, strain hardening and ductility even after high temperature aging for extended hours. Enhanced creep resistance at 650 degrees C is also evident in the AM Grade 91 steel compared to wrought Grade 91 steel tested at the same conditions. The diverse and complex microstructure of this AM steel allows for both enhanced strength and ductility but increases the ductile-to-brittle transition temperature in these steels. Published by Elsevier Ltd on behalf of Acta Materialia Inc.
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