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http://dx.doi.org/10.5516/NET.07.2012.009

NANO-STRUCTURAL AND NANO-CHEMICAL ANALYSIS OF NI-BASE ALLOY/LOW ALLOY STEEL DISSIMILAR METAL WELD INTERFACES  

Choi, Kyoung-Joon (Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST))
Shin, Sang-Hun (Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST))
Kim, Jong-Jin (Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST))
Jung, Ju-Ang (Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST))
Kim, Ji-Hyun (Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST))
Publication Information
Nuclear Engineering and Technology / v.44, no.5, 2012 , pp. 491-500 More about this Journal
Abstract
The dissimilar metal joints welded between Ni-based alloy, Alloy 690 and low alloy steel, A533 Gr. B with Alloy 152 filler metal were characterized by using optical microscope, scanning electron microscope, transmission electron microscope, secondary ion mass spectrometry and 3-dimensional atom probe tomography. It was found that in the weld root region, the weld was divided into several regions including unmixed zone in Ni-base alloy, fusion boundary, and heat-affected zone in the low alloy steel. The result of nanostructural and nanochemical analyses in this study showed the non-homogeneous distribution of elements with higher Fe but lower Mn, Ni and Cr in A533 Gr. B compared with Alloy 152, and the precipitation of carbides near the fusion boundary.
Keywords
Dissimilar Metal Weld; Scanning Electron Microscope; Secondary Ion Mass Spectrometry; Transmission Electron Microscope; 3-Dimensional Atom Probe Tomography; A533 Gr. B; Alloy 152; Stress Corrosion Cracking;
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