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Application of Small Specimen Test Technique to Evaluate Creep Behavior of Austenitic Stainless Steel

1
China Institute of Atomic Energy, Beijing 102413, China
2
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(16), 2541; https://doi.org/10.3390/ma12162541
Received: 10 July 2019 / Revised: 2 August 2019 / Accepted: 6 August 2019 / Published: 9 August 2019
(This article belongs to the Section Materials Physics)
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Abstract

Small specimen test techniques (SSTT) are highly demanded in the nuclear field. In the present work, SSTT was applied to the creep tests of 15-15Ti austenitic steel. The creep behaviors of specimens with miniaturized and standard sizes were contrastively studied. The feasibility of SSTT is verified after tests under more than 20 creep conditions. The results that were obtained by miniaturized specimens are relatively conservative and they can be securely applied. The stress exponent and apparent activation creep energy of 15-15Ti are calculated as 7.7 and 428 kJ/mol, respectively. The creep microstructures are characterized by the evolution of dislocations, deformation twins, and precipitates. View Full-Text
Keywords: creep; small specimen test techniques; fast reactor; austenitic steel; precipitation creep; small specimen test techniques; fast reactor; austenitic steel; precipitation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Yu, B.; Han, W.; Tong, Z.; Geng, D.; Wang, C.; Zhao, Y.; Yang, W. Application of Small Specimen Test Technique to Evaluate Creep Behavior of Austenitic Stainless Steel. Materials 2019, 12, 2541.

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