Nucleation mechanism of a nickel-base superalloy during dynamic recrystallization

doi:10.11890/1006-7191-114-295

Abstract

Abstract: Hot compression test was carried out at 1000 ℃ to investigate the dynamic recrystallization nucleation mechanism of a nickel-base superalloy. It was found that the bulging of original grain boundaries was inhibited by carbides and deformation twins at the boundaries. Recrystallized nuclei evolved from the subgrains of dislocation reconfiguration along original grain boundaries, and the growth of the potential nuclei was carried out by the coalescence of subgrains. The necklace structure of recrystallized grains along original grain boundaries was attributed to the strain gradient from grain boundary to grain interior.

Key words: Dynamic recrystallization, Electron backscattering diffraction (EBSD), Transmission electron microscopy (TEM), Superalloy

Shuai WANG, Lei WANG1, Yang LIU, Guohua XU, Beijiang ZHANG, Guangpu ZHAO. Nucleation mechanism of a nickel-base superalloy during dynamic recrystallization[J]. Acta Metallurgica Sinica (English Letters), 2011, 24(4): 295-300.

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