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難變形高溫合金GH720Li平衡析出相的熱力學(xué)計(jì)算
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國家自然科學(xué)基金（50771011）資助


Thermodynamic Calculation on Equilibrium Precipitated Phases in GH720Li Superalloy
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    摘要:

    為了給熱處理制度和熱加工工藝提供理論依據(jù)，采用Thermo-Calc熱力學(xué)計(jì)算軟件，對(duì)GH720Li合金平衡析出相和非平衡凝固進(jìn)行模擬計(jì)算分析。結(jié)果表明，合金凝固過程中Mo、Ti偏析比較嚴(yán)重，并給出Ti、Al含量對(duì)γ'相析出溫度和析出量的定量計(jì)算結(jié)果。C含量的增加可以顯著提高碳化物的析出量，但對(duì)碳化物的析出溫度無影響；Cr對(duì)M23C6的析出量沒有影響，但顯著提高其析出溫度。進(jìn)一步對(duì)一次碳化物MC的析出溫度與合金初熔點(diǎn)的關(guān)系進(jìn)行定量計(jì)算。

    Abstract:

    In order to provide theoretical guidance for hot working and heat treatment, the equilibrium precipitated phases and the effect of elements on the thermodynamic equilibrium phases for GH720Li superalloy were studied by Thermo-Calc software. The calculated results show that there is serious segregation of Mo and Ti during the solidification of the superalloy. The quantitative rule of the contents of Al and Ti on the precipitation temperature and mass fraction of γ' phase is presented. Increment of C content leads to more precipitation of carbides, but it has no effect on their precipitation temperatures. Cr can not change the precipitation content of M23C6, but it can increase the precipitation temperature remarkably. Furthermore, the relation between the precipitated temperature of MC and initial melting point of GH720Li superalloy was studied.

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于秋穎,董建新,張麥倉,鄭 磊.難變形高溫合金GH720Li平衡析出相的熱力學(xué)計(jì)算[J].稀有金屬材料與工程,2010,39(5):857~861.[Yu Qiuying, Dong Jianxin, Zhang Maicang, Zheng Lei. Thermodynamic Calculation on Equilibrium Precipitated Phases in GH720Li Superalloy[J]. Rare Metal Materials and Engineering,2010,39(5):857~861.]
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  • 收稿日期:2009-05-19
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