期刊
ACTA MATERIALIA
卷 215, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2021.117049
关键词
FeCrAl alloys; Surface mechanical grinding treatment; Work hardening; In situ compression
资金
- Department of Energy (DOE) Office of Nuclear Energy and Nuclear Energy University Program [18-15703, DE-NE0008787]
The study demonstrates the successful fabrication of gradient FeCrAl alloy with high strength and excellent work hardening ability through surface mechanical grinding treatment, potentially for various industrial applications.
FeCrAl alloy is a promising accident tolerant fuel cladding material for next generation nuclear reactors. Grain refinement may lead to FeCrAl alloys with improved mechanical properties. However, the addition of Al retains the ferrite phase and makes the grain refinement difficult through conventional thermomechanical treatments. In this study, a model FeCrAl alloy, C35M, was processed by surface mechanical grinding treatment. Microscopy studies show the formation of gradient microstructures, consisting of surface nanolaminate layer and ultra-fine-grained sublayer. In situ micropillar compression tests reveal the gradient FeCrAl alloy has a high flow stress, exceeding 1.4 GPa, and excellent work hardening capability. A modified Kocks-Mecking model was utilized to explain the grain size-dependent work hardening behavior. This study sheds lights on the design of gradient ferritic steels with high-strength and good work hardening ability for various industrial applications. Published by Elsevier Ltd on behalf of Acta Materialia Inc.
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