Study on Micro-Structure and Tensile Mechanical Properties of Dissimilar Metal Weld Joint Connecting Steam Generator Nozzle and Safe-End
| Autor: | Xiang Wenxin, Xiaokun Liu, Lei Qi, Qi Shuang, Lixun Cai, Jinhua Shi, Yonggang Wang, Weiwei Yu, Ning Fangmao |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Digital image correlation
Materials science Crystallography General Chemical Engineering Pressurized water reactor Stress–strain curve Welding Condensed Matter Physics European pressurized water reactor law.invention Inorganic Chemistry Steam generator (nuclear power) dissimilar metal weld joint law QD901-999 Vickers hardness test Ultimate tensile strength stress-strain relationship digital image correlation General Materials Science electron backscatter diffraction Composite material Joint (geology) |
| Zdroj: | Crystals, Vol 11, Iss 1470, p 1470 (2021) Crystals; Volume 11; Issue 12; Pages: 1470 |
| ISSN: | 2073-4352 |
| Popis: | The safe-end of a steam generator (SG) nozzle dissimilar metal weld (DMW) for pressurized water reactors (PWRs) is the weakest point of failure which is crucial for the safe operation of a nuclear power station. Related to materials micro-structures, a uniaxial stress–strain relationship is the basic input parameter for nuclear power plant design, safety evaluation, and life management. In this paper, the micro-structure and tensile mechanical properties of a DMW of a European pressurized water reactor (EPR) were studied. Vickers hardness tester, optical microscope, and electron back scatter diffraction were used to analyze the micro-structure of the DMW joint. In addition, the residual strain of the DMW joint base material, heat-affected zone, weld metal, and fusion boundary region were studied. Based on digital image correlation (DIC) technology, tensile mechanical properties of the DMW joint were obtained. The results show that an accurate tensile stress–strain relationship of dissimilar metal welded joints can be obtained by using the DIC technique, the weld is the relatively weak link, and the residual strain is concentrated in the heat-affected zone. This study provides valuable engineering information regarding nuclear power plant design, in-service performance testing, and structural analysis and evaluation of welds containing defects. |
| Databáze: | OpenAIRE |
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