Abstract: Simulated calculation and analysis on equilibrium precipitated phases γ,M₆C,P,μ and non-equilibrium solidification of alloy C-276(%;≤0.01C,14.5～16.5Cr,15.0~17.0Mo,≤2.5Co,4.0~7.0Fe,balance Ni)have been carried by using Thermo-Calc thermodynamic calculation software. Results show that during solidification of alloy the segregation of Mo and Cr is serious;and with increasing Cr content in alloy,the Cr content in matrix y phase increases obviously,while the Mo content in y phase decreases markedly; but the change of Mo content in alloy nearly hasn't infuence on Mo and Cr content in y phase,because with increasing initial Cr and Mo,the precipitated amount of P phase increases,and the Mo is main element of P phase, with increasing the amount of P phase, the Mo content in matrix γ phase decreases.

Key words: Nickel Base Alloy C-276, Precipitated Phases, Thermodynamic Calculation

摘要： 采用Thermo-Calc热力学计算软件,对C-276合金(%:≤0.01C、14.5～16.5Cr、15.0～17.0Mo、≤2.5Co、3.0～4.5W、4.0～7.0Fe、余Ni)平衡析出相γ、M₆C、P、μ和非平衡凝固进行了模拟计算分析。结果表明,合金凝固过程中Mo、Cr偏析比较严重;随合金中Cr含量增加,基体γ相中Cr含量明显增加,而γ相中Mo含量明显降低;但合金中Mo含量的变化对γ相中Mo、Cr含量几乎没有影响,因合金初始Cr、Mo含量的提高增加了P相析出量,P相中主要元素为Mo,P相的增加减少基体γ相中的Mo含量。

关键词: 镍基合金C-276, 析出相, 热力学计算