Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Fracture properties and crack tip constraint quantification of 321/690 dissimilar metal girth welded joints by using miniature SENB specimens

  • Bao, Chen (Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Engineering, Southwest Jiaotong University) ;
  • Sun, Yongduo (Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China) ;
  • Wu, Yuanjun (Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Engineering, Southwest Jiaotong University) ;
  • Wang, Kaiqing (Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China) ;
  • Wang, Li (Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China) ;
  • He, Guangwei (Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Engineering, Southwest Jiaotong University)
  • Received : 2020.07.06
  • Accepted : 2020.12.21
  • Published : 2021.06.25
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Abstract

By using miniature SENB specimens, the fracture properties of the materials in the region of welded metal, 321 stainless steel heat affected zone, 690 alloy heat affected zone of 321/690 dissimilar metal girth welded joints were tested. Both the J-resistance curves and critical fracture toughness of the three different materials are affected by the crack size because of the effect of crack tip constraint. Groups of constraint corrected J-resistance curves of the three materials are obtained according to J-Q-M approach. The welded metals exhibit the best fracture resistance but the worst fracture resistance is observed in the material of 690 alloy heat affected zone.

Keywords

Acknowledgement

This work is financially supported by the National Natural Science Foundation of China (Grant No. is 12072294). The authors thank the helpful comments and suggestions from anonymous reviewers.

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