Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Evaluation of cryogenic mechanical properties of aluminum alloy using small punch test

  • Hojun Cha (Smart Manufacturing Engineering, Changwon National University) ;
  • Seungmin Jeon (Department of Special Alloys, Extreme Materials Institute Korea Institute of Materials Science) ;
  • Donghyeon Yoon (Mechanical Engineering, Changwon National University) ;
  • Jisung Yoo (Department of Hydrogen Materials Evaluation, Extreme Materials Institute Korea Institute of Materials Science) ;
  • Seunggun Lee (Department of Hydrogen Materials Evaluation, Extreme Materials Institute Korea Institute of Materials Science) ;
  • Seokho Kim (Mechanical Engineering, Changwon National University)
  • Received : 2023.11.21
  • Accepted : 2023.12.29
  • Published : 2023.12.31
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Abstract

The Small Punch Test (SPT) was developed to evaluate the softening and embrittlement of materials such as power plants and nuclear fusion reactors by taking samples in the field. Specimens used in the SPT are very thin and small disk-shaped compared to specimens for general tensile test, and thus have economic advantages in terms of miniaturization and repeatability of the test. The cryogenic SPT can also be miniaturized and has a significantly lower heat capacity than conventional universal test machines. This leads to reduced cooling and warm-up times. In this study, the cryogenic SPT was developed by modifying the existing room temperature SPT to be cooled by liquid nitrogen using a super bellows and a thermal insulation structure. Since the cryogenic SPT was first developed, basic experiments were conducted to verify the effectiveness of it. For the validation, aluminum alloy 6061- T6 specimens were tested for mechanical properties at room and cryogenic temperature. The results of the corrected tensile properties from the SPT experiment results were compared with known room temperature and cryogenic properties. Based on the correction results, the effectiveness of the cryogenic SPT test was confirmed, and the surface fracture characteristics of the material were analyzed using a 3d image scanner. In the future, we plan to conduct property evaluation according to the development of various alloy materials.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIT) (No. 2019R1A5A8083201) and Fundamental Research Programs of PNK 9340 of the Korea Institute of Materials Science(KIMS)

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