Interfacial microstructure evolution of 12Cr1MoV/TP347H dissimilar steel welded joints during aging

Yuan Li; Yan-ping Zeng; Zhi-chun Wang

doi:10.1007/s12613-021-2295-1

Volume 28 Issue 9

Sep. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(9): 1497-1505

Yuan Li, Yan-ping Zeng, and Zhi-chun Wang, Interfacial microstructure evolution of 12Cr1MoV/TP347H dissimilar steel welded joints during aging, Int. J. Miner. Metall. Mater., 28(2021), No. 9, pp. 1497-1505. https://doi.org/10.1007/s12613-021-2295-1

Cite this article as:

Yuan Li, Yan-ping Zeng, and Zhi-chun Wang, Interfacial microstructure evolution of 12Cr1MoV/TP347H dissimilar steel welded joints during aging, Int. J. Miner. Metall. Mater., 28(2021), No. 9, pp. 1497-1505. https://doi.org/10.1007/s12613-021-2295-1

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Research Article

Interfacial microstructure evolution of 12Cr1MoV/TP347H dissimilar steel welded joints during aging

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Corresponding author:
Yan-ping Zeng E-mail: zengyanping@mater.ustb.edu.cn
Received: 30 January 2021; Revised: 27 March 2021; Accepted: 21 April 2021; Available online: 23 April 2021

Abstract

Abstract

The interfacial microstructure evolution of 12Cr1MoV/TP347H dissimilar steel welded joints with a nickel-based filler metal during aging was studied in detail to elucidate the mechanism of premature failures of this kind of joints. The results showed that not only a band of granular Cr₂₃C₆ carbides were formed along the fusion boundary in the ferritic steel during aging, but also a large number of granular or plate-like Cr₂₃C₆ carbides, which have a cube–cube orientation relationship with the matrix, were also precipitated on the weld metal side of the fusion boundary, making this zone be etched more easily than the other zone and become a dark etched band. Stacking faults were found in some Cr₂₃C₆ carbides. In the as-welded state, deformation twins were observed in the weld metal with a fully austenitic structure. The peak microhardness was shifted from the ferritic steel side to the weld metal side of the fusion boundary after aging and the peak value increased significantly. Based on the experimental results, a mechanism of premature failures of the joints was proposed.
- ferritic/austenitic dissimilar steel welded joint;
- interfacial microstructure;
- aging;
- nickel-based filler metal;
- mechanism of premature failures

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