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Microstructural Features and Ductile-Brittle Transition Behavior in Hot-Rolled Lean Duplex Stainless Steels

by O. Takahashi 1, Y. Shibui 2,†, P.G. Xu 3, S. Harjo 3, T. Suzuki 4 and Y. Tomota 4,*,‡
1
NIDAK Co., 3641 Tezuna B-kogyoudanchi, Kamitezuna Asayama, Takahagi, Ibaraki 318-0004, Japan
2
Graduate Student of Ibaraki University, 4-12-1 Nakanarusawa, Hitachi, Ibaraki 316-8511, Japan
3
Japan Atomic Energy Agency, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1195, Japan
4
Graduate School of Science and Engineering, Ibaraki University, 4-12-1 Nakanarusawa, Hitachi, Ibaraki 316-8511, Japan
*
Author to whom correspondence should be addressed.
Now at Hayashi Seiki Seizo Co., Ltd.
Now at National Institute of Advanced Industrial Science and Technology.
Quantum Beam Sci. 2020, 4(1), 16; https://doi.org/10.3390/qubs4010016
Received: 18 February 2020 / Revised: 1 March 2020 / Accepted: 3 March 2020 / Published: 5 March 2020
(This article belongs to the Special Issue Analysis of Strain, Stress and Texture with Quantum Beams)
The characteristics of texture and microstructure of lean duplex stainless steels with low Ni content produced through hot rolling followed by annealing were investigated locally with electron backscatter diffraction and globally with neutron diffraction. Then, the ductile–brittle transition (DBT) behavior was studied by Charpy impact test. It is found that the DBT temperature (DBTT) is strongly affected by the direction of crack propagation, depending on crystallographic texture and microstructural morphology; the DBTT becomes extremely low in the case of fracture accompanying delamination. A high Ni duplex stainless steel examined for comparison, shows a lower DBTT compared with the lean steel in the same crack propagating direction. The obtained results were also discussed through comparing with those of cast duplex stainless steels reported previously (Takahashi et al., Tetsu-to-Hagané, 100(2014), 1150). View Full-Text
Keywords: duplex stainless steel; ductile-brittle transition; neutron diffraction; texture; microstructure; electron backscatter diffraction duplex stainless steel; ductile-brittle transition; neutron diffraction; texture; microstructure; electron backscatter diffraction
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MDPI and ACS Style

Takahashi, O.; Shibui, Y.; Xu, P.; Harjo, S.; Suzuki, T.; Tomota, Y. Microstructural Features and Ductile-Brittle Transition Behavior in Hot-Rolled Lean Duplex Stainless Steels. Quantum Beam Sci. 2020, 4, 16.

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