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

作者：Choi Kyoung Joon; Shin Sang Hun; Kim Jung Jin; Jung Ju Ang; Kim Ji Hyun^*

来源：Nuclear Engineering and Technology, 2012, 44(5): 491-500.

DOI：10.5516/NET.07.2012.009

• 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

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.

• 出版日期2012-6