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Kim, Ji Hyun
UNIST Nuclear Innovative Materials Laboratory(UNIMAT)
Research Interests
  • High temperature water corrosion

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Effects of thermal aging on microstructures of low alloy steel-Ni base alloy dissimilar metal weld interfaces

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Title
Effects of thermal aging on microstructures of low alloy steel-Ni base alloy dissimilar metal weld interfaces
Author
Choi, Kyoung JoonKim, Jong JinLee, Bong HoBahn, Chi BumKim, Ji Hyun
Keywords
STRESS-CORROSION CRACKING; FUSION BOUNDARY REGION; STAINLESS-STEEL; ATOM-PROBE; JOINT; CHEMISTRY; WATER
Issue Date
201310
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF NUCLEAR MATERIALS, v.441, no.1-3, pp.493 - 502
Abstract
In this study, the advanced instrumental analysis has 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 °C for 2750 h. The micro- and nano-scale characterization were conducted mainly near in a weld root region by using optical microscopy, scanning electron microscopy, transmission electron microscopy, and three dimensional atom probe tomography. It was observed that the weld root was generally divided into several regions including dilution zone in the Ni-base alloy weld metal, fusion boundary, and heat-affected zone in the low alloy steel. A steep gradient was shown in the chemical composition profile across the interface between A533 Gr. B and Alloy 152. The precipitation of carbides was also observed along and near the fusion boundary of as-welded and aged dissimilar metal joints. It was also found that the precipitation of Cr carbides was enhanced by the thermal aging near the fusion boundary.
URI
http://scholarworks.unist.ac.kr/handle/201301/4011
DOI
http://dx.doi.org/10.1016/j.jnucmat.2013.07.003
ISSN
0022-3115
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