| Cite this article as: |
Jia Xiao, Ming Li, Jian-ping Liang, Li Jiang, De-jun Wang, Xiang-xi Ye, Ze-zhong Chen, Na-xiu Wang, and Zhi-jun Li, Fine structure characterization of an explosively-welded GH3535/316H bimetallic plate interface, Int. J. Miner. Metall. Mater., 28(2021), No. 11, pp. 1811-1820. https://doi.org/10.1007/s12613-020-2128-7
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An explosion-welded technology was induced to manufacture the GH3535/316H bimetallic plates to provide a more cost-effective structural material for ultrahigh temperature, molten salt thermal storage systems. The microstructure of the bonding interfaces were extensively investigated by scanning electron microscopy, energy dispersive spectrometry, and an electron probe microanalyzer. The bonding interface possessed a periodic, wavy morphology and was adorned by peninsula- or island-like transition zones. At higher magnification, a matrix recrystallization region, fine grain region, columnar grain region, equiaxed grain region, and shrinkage porosity were observed in the transition zones and surrounding area. Electron backscattered diffraction demonstrated that the strain in the recrystallization region of the GH3535 matrix and transition zone was less than the substrate. Strain concentration occurred at the interface and the solidification defects in the transition zone. The dislocation substructure in 316H near the interface was characterized by electron channeling contrast imaging. A dislocation network was formed in the grains of 316H. The microhardness decreased as the distance from the welding interface increased and the lowest hardness was inside the transition zone.
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