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

International Journal of Minerals,Metallurgy and Materials 2021年第9期28卷 1497-1505页

作者： Yuan Li Yan-ping Zeng Zhi-chun Wang School of Materials Science&Engineering University of Science and Technology BeijingBeijing 100083China North China Electric Power Research Institute Co. Ltd.Beijing 100045China

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 *** results showed that not only a band of granular Cr_(23)C_(6)carbides were formed along the fusion boundary in the ferritic steel during aging,but also a large number of granular or plate-like Cr_(23)C_(6)carbides,which have a cube-cube orientation relationship with the matrix,were also precipitated on the weld metal side of the fu-sion boundary,making this zone be etched more easily than the other zone and become a dark etched *** faults were found in some Cr_(23)C_(6)*** the as-welded state,deformation twins were observed in the weld metal with a fully austenitic *** peak micro-hardness was shifted from the ferritic steel side to the weld metal side of the fusion boundary after aging and the peak value increased *** on the experimental results,a mechanism of premature failures of the joints was proposed.

关键词： ferritic/austenitic dissimilar steel welded joint interfacial microstructure aging nickel-based filler metal mechanism of premature failures

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