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| Exploration on Uniaxial Stress-strain Relationship of Welded Joint by Flat Indentation Method |
| Received:May 06, 2021 Revised:June 22, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2022.01.013 |
| KeyWord:dissimilar metal welded joint flat indentation stress-strain relationship heat affected zone water reactor |
| Author | Institution |
| QI Shuang |
Southwest Jiaotong University, Chengdu , China;Taishan Nuclear Power Joint Venture Co., Ltd., Jiangmen , China;Suzhou Nuclear Power Research Institute, Suzhou , China |
| XIANG Wen-xin |
Taishan Nuclear Power Joint Venture Co., Ltd., Jiangmen , China |
| LIU Xiao-kun |
Southwest Jiaotong University, Chengdu , China |
| CAI Li-xun |
Southwest Jiaotong University, Chengdu , China |
| XUE Fei |
Suzhou Nuclear Power Research Institute, Suzhou , China |
| WANG Yong-gang |
Taishan Nuclear Power Joint Venture Co., Ltd., Jiangmen , China |
| NING Fang-mao |
Taishan Nuclear Power Joint Venture Co., Ltd., Jiangmen , China |
| YU Wei-wei |
Suzhou Nuclear Power Research Institute, Suzhou , China |
| MEI Jin-na |
Suzhou Nuclear Power Research Institute, Suzhou , China |
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| Abstract: |
| The work aims to obtain the local tensile stress-strain relationship between the base metal and the heat affected zone of dissimilar metal welded joint (DMWJ). The DMWJ (20MnD 5-Inconel 52-Z2CND 18.12 nitrogen control) between the steam generator nozzle and the safe-end of Water Reactor was studied. Through the optical microscope and micro-hardness test, the micro-structure and hardness distribution of DMWJ base metal, heat affected zone and weld fusion line were investigated. The stress-strain relationship of the DMWJ low-alloy steel base metal was obtained by the straight round bar tensile test, and the local stress-strain relationship of the DMWJ low-alloy steel base metal, heat affected zone and weld was obtained by the flat indentation technology based on energy equivalence theory. The micro-structure and mechanical properties of DMWJ were not uniform. The tensile stress-strain relationship of base metal obtained by the straight round bar tensile test was in good agreement with the results obtained by the flat indentation technology. The local stress-strain relationship of the DMWJ low-alloy steel base metal, heat affected zone and weld can be accurately measured by flat indentation technology based on energy equivalence theory, which is of great significance for service inspection and structural integrity evaluation of DMWJ in the water reactor nuclear power station. |
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