Tensile properties of mechanically alloyed Zr added austenitic stainless steel
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 conventiona...
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doaj-3ac50b9ae6494565915c3354f61d97f92020-11-25T02:28:56ZengElsevierNuclear Materials and Energy2352-17912018-05-01159296Tensile properties of mechanically alloyed Zr added austenitic stainless steelDaniel Morrall0Jin Gao1Zhexian Zhang2Kiyohiro Yabuuchi3Akihiko Kimura4Takahiro Ishizaki5Yusaku Maruno6Graduate School of Energy Science, Kyoto University, Yoshida-honmachi, Sakyou-ku, Kyoto 606-8501, Japan; Corresponding author.Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, JapanInstitute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, JapanInstitute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, JapanInstitute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, JapanHitachi, Ltd. Research & Development Group, Hitachi, Ibaraki 319-1292, JapanHitachi, Ltd. Research & Development Group, Hitachi, Ibaraki 319-1292, JapanA 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 0.42 µm in MA304LZ and about 34/30 µm in SUS304L/316 L. In MA304LZ, two types of precipitates were observed; inhomogeneously distributed fine precipitates with an average size of 6.0 nm and homogeneously distributed coarse precipitates (d > 20 nm) with an average size of 47 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. Keywords: Powder metallurgy, Grain size effect, Precipitation hardening, Zr-oxideshttp://www.sciencedirect.com/science/article/pii/S2352179117301783 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Daniel Morrall Jin Gao Zhexian Zhang Kiyohiro Yabuuchi Akihiko Kimura Takahiro Ishizaki Yusaku Maruno |
spellingShingle |
Daniel Morrall Jin Gao Zhexian Zhang Kiyohiro Yabuuchi Akihiko Kimura Takahiro Ishizaki Yusaku Maruno Tensile properties of mechanically alloyed Zr added austenitic stainless steel Nuclear Materials and Energy |
author_facet |
Daniel Morrall Jin Gao Zhexian Zhang Kiyohiro Yabuuchi Akihiko Kimura Takahiro Ishizaki Yusaku Maruno |
author_sort |
Daniel Morrall |
title |
Tensile properties of mechanically alloyed Zr added austenitic stainless steel |
title_short |
Tensile properties of mechanically alloyed Zr added austenitic stainless steel |
title_full |
Tensile properties of mechanically alloyed Zr added austenitic stainless steel |
title_fullStr |
Tensile properties of mechanically alloyed Zr added austenitic stainless steel |
title_full_unstemmed |
Tensile properties of mechanically alloyed Zr added austenitic stainless steel |
title_sort |
tensile properties of mechanically alloyed zr added austenitic stainless steel |
publisher |
Elsevier |
series |
Nuclear Materials and Energy |
issn |
2352-1791 |
publishDate |
2018-05-01 |
description |
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 0.42 µm in MA304LZ and about 34/30 µm in SUS304L/316 L. In MA304LZ, two types of precipitates were observed; inhomogeneously distributed fine precipitates with an average size of 6.0 nm and homogeneously distributed coarse precipitates (d > 20 nm) with an average size of 47 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. Keywords: Powder metallurgy, Grain size effect, Precipitation hardening, Zr-oxides |
url |
http://www.sciencedirect.com/science/article/pii/S2352179117301783 |
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