Effects of PWHT on Microstructure and Mechanical Properties of Weld Metals of Ni-Based Superalloy 617 and 263 for Hyper-Supercritical Power Plants

Kim, Jeong Kil; Park, Hae Ji; Shim, Deog Nam

doi:10.1007/s40195-016-0494-y

Cited by 27 publications

(2 citation statements)

References 31 publications

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“…Except for the γ particles, there are other two kinds of precipitates in N263. One is irregular shaped Ti-rich MC formed in melt precipitate of intragranular region, the other is small Cr-rich M 23 C 6 densely precipitate at both grain and twin boundaries [9][10][11][12]. Zhao et al [13] reported a phase transformation in N263 after thermal exposure, where acicular η phase precipitated at the expense of γ over 750°C.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, welding as a widely used N263 processing method, also arises many researchers’ interest in characterising the weld joint. Kim et al [14] studied the effect of post weld heat treatment (PWHT) at 810°C on the microstructure of alloy 263 gas tungsten arc welding (GTAW) weld joint, where they primarily observed two kinds of carbides in weld metal: the MC mainly distributed on the grain boundary and dendrite gap, and M 23 C 6 distributed near the grain boundary. The results are consistent with the study of microstructure of N263 GTAW weld joint by Jeon et al [15].…”

Section: Introductionmentioning

confidence: 99%

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The correlated mechanism of creep fracture and microstructure evolution for precipitated Nimonic 263 superalloy welding joint

Fan

Cui

et al. 2020

Science and Technology of Welding and Joining

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The correlated mechanism of microstructural evolution and creep failure of N263 weld joint was studied in this paper. Results show that the creep failure presented in weld metal (WM), which initiated in the solute poor area near coarsened MC and/or M 23 C 6 where Mo and Ti elements emigrated and merged with small MC/M 23 C 6 to larger ones. Moreover, the crack propagated along the primary dendrite wall and second dendrite arm in which Mo and Ti are poor due to the precipitation and coarsening of MC/M 23 C 6 , which is caused by the different partition coefficient of main alloy elements during non-equilibrium solidification. However, the transition of decomposed MC to fine η phase during creep in WM is not responsible to crack initiation and propagation.

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