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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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Fusion boundary precipitation in thermally aged dissimilar metal welds studied by atom probe tomography and nanoindentation

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Title
Fusion boundary precipitation in thermally aged dissimilar metal welds studied by atom probe tomography and nanoindentation
Author
Choi, Kyoung JoonKim, TaehoYoo, Seung ChangKim, SeunghyunLee, Jae HyukKim, Ji Hyun
Issue Date
2016-04
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF NUCLEAR MATERIALS, v.471, pp.8 - 16
Abstract
In this study, microstructural and mechanical characterizations were performed to investigate the effect of long-term thermal aging on the fusion boundary region between low-alloy steel and Nickel-based weld metal in dissimilar metal welds used in operating power plant systems. The effects of thermal aging treatment on the low-alloy steel side near the fusion boundary were an increase in the ratio of Cr constituents and Cr-rich precipitates and the formation and growth of Cr23C6. Cr concentrations were calculated using atom probe tomography. The accuracy of simulations of thermal aging effects of heat treatment was verified, and the activation energy for Cr diffusion in the fusion boundary region was calculated. The mechanical properties of fusion boundary region changed based on the distribution of Cr-rich precipitates, where the material initially hardened with the formation of Cr-rich precipitates and then softened because of the reduction of residual strain or coarsening of Cr-rich precipitates.
URI
https://scholarworks.unist.ac.kr/handle/201301/18019
URL
http://www.sciencedirect.com/science/article/pii/S0022311515304165
DOI
10.1016/j.jnucmat.2015.12.047
ISSN
0022-3115
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