Fine structure characterization of an explosively-welded GH3535/316H bimetallic plate interface

Jia Xiao; Ming Li; Jian-ping Liang; Li Jiang; De-jun Wang; Xiang-xi Ye; Ze-zhong Chen; Na-xiu Wang; Zhi-jun Li

doi:10.1007/s12613-020-2128-7

Volume 28 Issue 11

Nov. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(11): 1811-1820

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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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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Research Article

Fine structure characterization of an explosively-welded GH3535/316H bimetallic plate interface

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Corresponding authors:
Ze-zhong Chen E-mail: zzhchen@usst.edu.cn

Zhi-jun Li E-mail: lizhijun@sinap.ac.cn
Received: 9 March 2020; Revised: 19 June 2020; Accepted: 24 June 2020; Available online: 26 June 2020

Abstract

Abstract

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.
- GH3535/316H bimetallic plate;
- ultrahigh temperature molten salt;
- explosive welding;
- interface structure;
- dislocation substructure

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