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STUDY OF TCP PHASE PRECIPITATING IN GH4199 SUPERALLOY

T.Cui , Y.S.Zhang , S.W.Guo , L.Wang , H.C.Yang

金属学报(英文版)

The precipitating regulation and mechanism of TCP phase (μ phase and σ phase) are studied, using electron hole number (EHN) theory, phase analysis technology and TEM observation. The results indicate that the EHN in studied alloy is 2.311-2.348 which is higher than that of critical EHN of μ phase precipitate (2.30), so μ phase could precipitate if there is enough thermo-expasition. In contrast, the calculated EHN is less than that of critical EHN of σ phase precipitate (2.52). However the σ phase is also observed by TEM.Enrich of Cr and Mo around γ phase after γ' phase precipitated leads to σ phase precipitated.

关键词: superalloy , null , null

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