Coupled modelling of solidification and solution heat treatment of advanced single crystal nickel base superalloy
Coupled modelling of solidification and solution heat treatment of advanced single crystal nickel base superalloy
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DOI：
10.1179/174328408x369320
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发表时间：
2009-02
影响因子：
1.8
通讯作者：
N. Warnken;H. Larsson;R. Reed
中科院分区：
文献类型：
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作者：
N. Warnken;H. Larsson;R. Reed
对一种先进的含钌单晶镍基高温合金定向凝固及固溶热处理过程中微观偏析和相形成的两种数值模拟模型进行了测试和比较。第一种方法是基于一次凝固的一维前跟踪和凝固最后阶段的均匀化方法以及固溶热处理。该模型的计算是在一维柱面坐标系下进行的。第二种是基于相场法，应用于凝固和随后的固溶热处理，其中计算是在二维中进行的。这两个模型都耦合到热力学和动力学数据库，根据calphhad方法建模。提出了基于计算机的固溶热处理优化的概念。结果表明，这两种方法都能够处理现代高温合金的复杂性，并从两种模型中获得了真实的结果。
Two numerical models to simulate microsegregation and phase formation during directional solidification and subsequent solution heat treatment of an advanced experimental ruthenium containing single crystal nickel base superalloy are tested and compared. The first method is based on a one-dimensional front tracking for the primary solidification and a homogenisation method for the final stages of solidification as well as for the solution heat treatment. Calculations for this model are carried out in one-dimension using cylindrical coordinates. The second is based upon the phase field method, applied to solidification and subsequent solution heat treatment, where calculations are carried out in two-dimension. Both models are coupled to thermodynamic and kinetics databases modelled according to the CALPHAD method. A concept of computer based optimisation of solution heat treatments is proposed. The results show that both methods are capable of handling the complexity of contemporary superalloys, and realistic results are obtained from both models.