K488合金平衡相的熱力學(xué)計(jì)算

K488合金平衡相的熱力學(xué)計(jì)算Thermodynamic Calculation of Equilibrium Phases of K488 Alloy

利用Thermo-Calc熱力學(xué)計(jì)算軟件，對(duì)K488合金平衡相和合金元素對(duì)析出相的影響規(guī)律進(jìn)行了計(jì)算和實(shí)驗(yàn)兩方面的分析。計(jì)算和實(shí)驗(yàn)結(jié)果均表明：合金的平衡相主要有γ、γ'、σ、碳化物，合金凝固過(guò)程中Mo，Ti偏析比較嚴(yán)重；隨著C和Nb含量的增加，MC的析出量增加而析出溫度降低，Ti元素則相反；Al、Ti元素含量的增加，γ'相析出量和析出溫度逐漸增加；Cr含量對(duì)σ相的析出量和析出溫度影響最大；計(jì)算和實(shí)驗(yàn)結(jié)果具有較好的一致性。

The influence of equilibrium and alloy elements on the precipitation phases of K488 alloy was calculated and experimental analyzed by using Thermo-Calc thermodynamic calculation software. The results of calculation and experiment are shown that the alloy equilibrium phases are γ,γ',σ and carbides. In the alloy solidification process, Mo, Ti segregations are more serious. With the increase of C and Nb content, MC precipitation increased, but precipitation temperature decreased, the content of Ti is on the contrary. the increase of Al, Ti contents, γ' phase precipitations amount and precipitation temperature gradually increased. The content of Cr has most influence on the precipitation amount and precipitation temperature of the sigma phase. The calculation and experimental results have good consistency.

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