Journal
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 13, Issue -, Pages 1698-1708Publisher
ELSEVIER
DOI: 10.1016/j.jmrt.2021.05.112
Keywords
ODS steels; Carbides; Oxides; Mechanical properties
Funding
- National Key Research and Development Program of China [2017YFB0701801]
- National Natural Science Founda-tion of China [U1960204, 51974199]
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The addition of Al can improve the size and distribution of carbides in ODS steels, leading to increased ductility but slightly decreased strength.
Two oxide dispersion strengthened (ODS) steels with compositions of 9Cr-ODS (9Cr-ODS) and 9Cr-3Al-ODS (9Cr-ODS-Al) were fabricated by hot isostatic pressing (HIP). The microstructures and precipitates of the ODS samples were characterized by scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM). The results showed that the addition of Al could reduce the precipitation of coarse M23C6 and optimized the size of carbides in ODS steels. Furthermore, it was found that the mean size of nanoparticles in 9Cr-ODS-Al is larger than that in 9Cr-ODS due to the formation of large-size Y-Al-O nanoparticles with Al addition. The tensile test results indicated that the addition of Al slightly decreased the strength of ODS steels, but substantially increased the ductility. (C) 2021 The Authors. Published by Elsevier B.V.
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