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FGH95合金中γ′相穩(wěn)定性研究
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國(guó)家自然科學(xué)基金資助項(xiàng)目(50471097)


Stability of γ′ Phase in FGH95 Superalloy
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    摘要:

    利用掃描電鏡和透射電鏡觀察分析了熱等靜壓HIP FGH95高溫合金經(jīng)熱處理后，基體中γ′相的形貌、分布和穩(wěn)定性。結(jié)果表明：合金經(jīng)熱處理后基體為再結(jié)晶晶粒與原始枝晶的混晶組織?；w中除了晶界上分布的固溶處理未溶的棒狀γ′相顆粒外，在再結(jié)晶晶粒內(nèi)部還存在有大、中、小3種尺寸的γ′顆粒，其中大的方形γ′相顆粒尺寸約為0.5～0.8 μm, 并呈8個(gè)一組排列，此8個(gè)一組排列的γ′相顆粒是由合金在1160 ℃固溶冷卻過(guò)程中所形成的單個(gè)高溫γ′相分裂而形成。進(jìn)一步觀察發(fā)現(xiàn)，分裂后的方形γ′相顆粒在后續(xù)熱處理過(guò)程中又發(fā)生了不穩(wěn)定分解，在其顆粒內(nèi)部有細(xì)小γ′相的重新析出，并且隨著新析出γ′相的長(zhǎng)大原來(lái)的方形γ′相顆粒逐漸消失。

    Abstract:

    The microstructure of γ′ phase in HIPFGH95 superalloy was investigated by use of SEM and TEM. The results show that the microstructure is a mixture of recrystal grains and original dendrite crystals after the heat treatment. The undissolved particles of γ′ phase during the solution treatment distribute in the grain boundaries. Meanwhile, there are three different sizes of γ′ particles within the recrystal grains. Among them, the big and square γ′ particles exhibit arrays of every 8 particles, which are formed from the spitted single γ′ particles precipitated during the cooling procedure from 1160 ℃. Moreover, which would decompose to form finer γ′ precipitates, at the same time, the cube γ′ particles disappear with the growth of finer γ′ precipitates.

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李紅宇,宋西平,王艷麗,陳國(guó)良. FGH95合金中γ′相穩(wěn)定性研究[J].稀有金屬材料與工程,2009,38(1):64~67.[Li Hongyu, Song Xiping, Wang Yanli, Chen Guoliang. Stability of γ′ Phase in FGH95 Superalloy[J]. Rare Metal Materials and Engineering,2009,38(1):64~67.]
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  • 收稿日期:2008-02-18
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