摘要
基于Scheil-Gulliver凝固模型,采用热力学计算软件Thermo-Calce及相应的Ni基数据库,对FGH96高温合金的凝固过程进行了热力学模拟计算,以揭示FGH96合金凝固过程中各相的析出规律,及凝固过程中各元素的偏析行为;并用Scheil-Gulliver方程对残余液相中各合金元素的质量分数随固相分数的变化进行回归,得到了各元素的平衡分配系数。结果表明,在FGH96合金凝固过程中,当固相分数达到0.7、0.94、0.98时由残余液相中分别开始析出MC型碳化物、TCP相、γ′相;B、C、Mo、Nb、Ti、Zr、Si的平衡分配系数小于1,而Co、Cr、W、Fe、Al的平衡分配系数大于1。
Based on the Scheil-Gulliver solidification model the solidification simulation of FGH96 superalloy has been made by the Thermo-Calc thermodynamic software combined with the related nickel-based database to show the precipitation behaviors of various phase and the segregation behaviors of various elements in the solidification process.Equilibrium partition coefficients of various elements were obtained by regressing the dependence of mass fraction of various alloy elements in the remaining liquid on the mass fraction of solid phase using the Scheil-Gulliver model.The results show that: when mass fraction of solid is achieve 0.7,0.94,0.98,the precipitation of MC carbides,TCP phase,γ′phase from the remaining liquid begins in the solidification process,respectively;equilibrium partition coefficients of B,C,Mo,Nb,Ti,Zr,Si are less than 1 and the equilibrium partition coefficients of Co,Cr,W,Fe,Al are greater than 1.
出处
《铸造技术》
CAS
北大核心
2012年第1期12-16,共5页
Foundry Technology
