期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.09.111
关键词
ODS steel; Bimodal structure; Back stress strengthening; Orowan strengthening
类别
资金
- National Magnetic Confinement Fusion Energy Research Project of China [2015GB121006]
- National Natural Science Foundation of China [51501158]
- NSERC/UNENE/Nu-Tech Precision Metals Industrial Research Chair Program at Queen's University
- China Scholarship Council [201706460042]
Oxide dispersion strengthened (ODS) steels of Fe-9Cr-xAl (x = 0.4, 2.5, 4.5 and 8.0 wt%) have been fabricated by mechanical alloying, hot isostatic pressing and subsequent forging. Both the ferrite matrix and yttria particles were coarsened by the addition of Al. However, a bimodal structure consisting of coarse grains closely surrounded by fine grains is formed, and develops with increasing Al addition. Moreover, at the same time, nano sized alumina particles precipitate in the interior of the bimodal ferrite grains. The tensile strength increases gradually with Al addition due to back stress strengthening combined with Orowan strengthening. The formation mechanism of the bimodal structure and intragranular precipitation of the Al added ODS steels were also discussed.
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