Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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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))
  • Received : 2012.02.07
  • Accepted : 2012.04.19
  • Published : 2012.06.25
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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.

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References

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