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C1023铸造镍基高温合金,在试验温度(800～950℃)范围内时效50小时,有σ相析出,析出数量在900℃出现峰值,其数量多少主要取决于相的长大线速度,低于900℃时,σ相长大线速度主要取决于扩散因素,随温度升高而增加;高于900℃,σ相相变激活能随温度的升高增加,σ相析出数量随温度的升高而降低;本文分析了合金元素对γ相自由能的影响,得出了合金元素对σ相析出作用的规律。
C1023 cast nickel-base superalloy aged for 50 hours at the test temperature (800 ~ 950 ℃), there is σ phase precipitation, the number of precipitates peaked at 900 ℃, the number depends largely on the number of the growth of linear velocity below When the temperature is 900 ℃, the maximum linear velocity of sigma phase depends on the diffusion coefficient and increases with the increase of temperature. When the temperature is above 900 ℃, the activation energy of σ phase increases with the increase of temperature, and the amount of σ phase precipitates increases with the increase of temperature But the influence of alloying elements on the γ phase free energy was analyzed. The law of the alloying elements’ precipitation on σ phase was obtained.