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Kim, Ji Hyun
UNIST Nuclear Innovative Materials Laboratory(UNIMAT)
Research Interests
  • High temperature water corrosion
  • Liquid metal corrosion
  • Material degradation simulation

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원전 이종금속 용접부의 장기 열적 시효에 따른 미세조직 및 기계적 특성변화에 관한 고찰

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Title
원전 이종금속 용접부의 장기 열적 시효에 따른 미세조직 및 기계적 특성변화에 관한 고찰
Other Titles
A study on the change of microstructural and mechanical properties by the long-term thermal aging of dissimilar metal welds in nuclear power plants
Author
최경준유승창김지현
Issue Date
2014-07
Publisher
한국압력기기공학회
Citation
한국압력기기공학회 논문집, v.10, no.1, pp.82 - 89
Abstract
In this study, the metallurgical analysis and mechanical property measurement have been performed to investigate the effect of long-term thermal aging on the microstructural evolution in the fusion boundary region between weld metal and low alloy steel in dissimilar metal welds. A representative dissimilar weld mock-up made of Alloy 690-Alloy 152-A533 Gr. B was fabricated and aged at 450℃ for 2,750 hours. The microstructural characterization was conducted mainly near in a weld root region by using optical microscopy, scanning electron microscopy, transmission electron microscopy. And the mechanical properties were measured with Vickers microhardness test and nanoindentation method. A steep gradient was shown in the chemical composition profile across the interface between A533 Gr. B and Alloy 152. Type-II boundaries were found in weld side of DMW and the hardness was the highest at the narrow zone between Type-II boundary and fusion boundary.
URI
https://scholarworks.unist.ac.kr/handle/201301/11864
URL
http://scholar.ndsl.kr/schDetail.do?cn=JAKO201404641500213
ISSN
1738-8333
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