《Table 1.Chemical composition of the ZhS6U base metal》

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《Weldability and liquation cracking behavior of ZhS6U superalloy during electron-beam welding》

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wt%

Fig.2 illustrates a non-heat-treated microstructure coupon in which the light phase and the needle-shaped carbide in the matrix phase（γphase andγ′precipitates，respectively）are visible.The energy dispersive spectroscopy（EDS）analysis results for point A（Fig.2）are presented in Table 2.These results indicate that MC carbides are present in the microstructure.During the service time of the superalloy under high temperature，these carbides did not transform to M23C6 and M6C carbides.