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| INFLUENCE OF ELECTRIC FIELD TREATMENT ON PRECIPITATION BEHAVIOR OF d PHASE IN GH4169 SUPERALLOY |
Lei WANG1( ),Jinlan AN1,Yang LIU1,Xiu SONG1,Guohua XU2,Guangpu ZHAO2 |
1 Key Lab for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University,
Shenyang 110819
2 High Temperature Material Research Institute, Central Iron and Steel Research Institute, Beijing 100081 |
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Cite this article:
Lei WANG,Jinlan AN,Yang LIU,Xiu SONG,Guohua XU,Guangpu ZHAO. INFLUENCE OF ELECTRIC FIELD TREATMENT ON PRECIPITATION BEHAVIOR OF d PHASE IN GH4169 SUPERALLOY. Acta Metall Sin, 2015, 51(10): 1235-1241.
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Abstract GH4169 alloy is widely used to make aero engine, gas turbine as it is one of the most important superalloy. γ’' phase is the main strengthen phase, however, the metastable γ’' phase will transform to stable d phase during aging or servicing for certain time. d phase is significance in the alloy, its precipitating and distributing behavior have an effect on the properties of the alloy. In recent year, researchers pay more attention on electric field treatment (EFT), this is because of high energy density, accurate controlling, clean and safety. EFT is one of the most important energy field except temperature field and stress field. In this work, EFT was performed on GH4169 superalloy to investigate the influence of EFT on precipitation behavior of d phase in the alloy, and the mechanism of the effect of EFT on the phase transformation was also discussed. The results show that d phases precipitate on the grain boundaries after EFT with 8 kV/cm at 850 ℃ for 15 min, and large amounts of γ’' phases precipitate inside the grains. With the increasing of EFT time, both the volume fraction and the size of d phase increase, at the same time the size of γ’' phase increases. The volume fraction of d phase is less and the size of d phase is smaller, and the volume fraction of γ’' phase is higher by EFT, compared with that by aging treatment (AT) for the same time. In addition, the Nb content on the grain boundary decreases and both Fe and Cr content increase, meanwhile the lattice parameters of c decreases and a, b increase. The vacancy concentrations can be accelerated by EFT, so that the diffusion of Fe and Cr atoms can be promoted. Meanwhile, the Nb atoms in d phases on the grain boundaries can be displaced by Fe atoms and Cr atoms, therefore the Nb atoms are dissolved into the grain. The nucleation rate of γ’' phases increases with the increasing of vacancy concentrations. The vacancies relax coherent distortion between γ phases and γ’' phases, and suppress γ’' phases to transform to d phases. Thus the stabilization of γ’' phases is enhanced.
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| Fund: Supported by High Technology Research and Development Program of China (No.2012AA03A513) and National Natural Science Foundation of China (Nos.51171039 and 51371044) |
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