Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7987297 | Nuclear Materials and Energy | 2018 | 5 Pages |
Abstract
A mechanically alloyed austenitic stainless steel (MA304LZ) was produced from pre-alloyed SUS304L powder with a small amount of Zr addition. The yield stress of MA304LZ was more than 3 times larger than that of SUS304L or 316L, while total elongation was reduced to about one third of the conventional steels. Microstructure analysis revealed an average grain size of 0.42â¯Âµm in MA304LZ and about 34/30â¯Âµm in SUS304L/316â¯L. In MA304LZ, two types of precipitates were observed; inhomogeneously distributed fine precipitates with an average size of 6.0â¯nm and homogeneously distributed coarse precipitates (dâ¯>â¯20â¯nm) with an average size of 47â¯nm. The strengthening mechanism of MA304LZ was discussed on the bases of Hall-Petch and Orowan equations, and the strengthening of MA304LZ was attributed mostly to refined grains. The dislocation barrier strength factor, α, is estimated to be 0.277 for the Zr-rich precipitates in MA304LZ.
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Authors
Daniel Morrall, Jin Gao, Zhexian Zhang, Kiyohiro Yabuuchi, Akihiko Kimura, Takahiro Ishizaki, Yusaku Maruno,