[논문]Deformation behavior of austenitic stainless steel at deep cryogenic temperatures

Han, Wentuo; Liu, Yuchen; Wan, Farong; Liu, Pingping; Yi, Xiaoou; Zhan, Qian; Morrall, Daniel; Ohnuki, Somei

doi:10.1016/j.jnucmat.2018.03.019

Deformation behavior of austenitic stainless steel at deep cryogenic temperatures

Journal of nuclear materials = Journal des matériaux nucléaires, v.504, 2018년, pp.29 - 32

Han, Wentuo (School of Materials Science and Engineering, University of Science and Technology Beijing) , Liu, Yuchen (School of Materials Science and Engineering, University of Science and Technology Beijing) , Wan, Farong (School of Materials Science and Engineering, University of Science and Technology Beijing) , Liu, Pingping (School of Materials Science and Engineering, University of Science and Technology Beijing) , Yi, Xiaoou (School of Materials Science and Engineering, University of Science and Technology Beijing) , Zhan, Qian (School of Materials Science and Engineering, University of Science and Technology Beijing) , Morrall, Daniel (Graduate School of Energy Science, Kyoto University) , Ohnuki, Somei (School of Materials Science and Engineering, University of Science and Technology Beijing)

Abstract ▼ AI-Helper

Abstract The nonmagnetic austenite steels are the jacket materials for low-temperature superconductors of fusion reactors. The present work provides evidences that austenites transform to magnetic martensite when deformation with a high-strain is imposed at 77 K and 4.2 K. The 4.2 K test is characterized by serrated yielding that is related to the specific motion of dislocations and phase transformations. The in-situ transmission electron microscope (TEM) observations in nanoscale reveal that austenites achieve deformation by twinning under low-strain conditions at deep cryogenic temperatures. The generations of twins, martensitic transformations, and serrated yielding are in order of increasing difficulty. Highlights 316LN can be martensitic and magnetic when imposing large strains at 4.2 K and 77 K. The deformation under low strains at low temperatures is achieved by twinning. The specific serrated yielding at 4.2 K is characterized in detail. An equation for judging the serration generation is proposed. In-situ TEM observations of deformations at low temperatures are achieved.

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참고문헌 (16)

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Deformation behavior of austenitic stainless steel at deep cryogenic temperatures

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