Creep of stainless steel under heat flux cyclic loading (500-1000C) with different mechanical preloads in a vacuum environment using 3D-DIC

Yong Su , Zhiwei Pan , Yongpei Peng , Shenghong Huang , Qingchuan Zhang

Abstract

In nuclear fusion reactors, the key structural component (i.e., the plasma-facing component) undergoes high heat flux cyclic loading. To ensure the safety of fusion reactors, an experimental study on the temperature-induced creep of stainless steel under heat flux cyclic loading was performed in the present work. The strains were measured using a stereo digital image correlation technique (3D-DIC). The influence of the heat haze was eliminated, owing to the use of a vacuum environment. The specimen underwent heat flux cycles (500 C-1000 C) with different mechanical preloads (0 kN, 10 kN, 30 kN, and 50 kN). The results revealed that, for a relatively large preload (for example, 50 kN), a single temperature cycle can induce a residual strain of up to 15000.

Key Words

digital image correlation; nuclear fusion; high temperature measurement; creep; vacuum chamber

Address

Yong Su — CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China; IAT-Chungu Joint Laboratory for Additive Manufacturing, Anhui Chungu 3D Printing Institute of Intelligent Equipment and Industrial Technology, Wuhu 241200, China
Zhiwei Pan, Yongpei Peng, Shenghong Huang and Qingchuan Zhang — CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China

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