Phase field modeling of solidification in multi-component alloys with a case study on the Inconel 718 alloy
Phase field modeling of solidification in multi-component alloys with a case study on the Inconel 718 alloy
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DOI：
10.1557/jmr.2017.393
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发表时间：
2017-12-28
影响因子：
2.7
通讯作者：
Glatzel, Uwe
中科院分区：
文献类型：
--
作者：
Fleck, Michael;Querfurth, Frank;Glatzel, Uwe
本文建立了一个用于模拟复杂金属合金化学扩散限制凝固过程的相场模型。所需的热力学和动力学输入信息是从CALPHAD计算使用商业软件包ThermoCalc。在镍基高温合金Inconel 718的案例研究中，我们进行了凝固模拟，明确考虑了6种不同的化学元素。作为恒定的过冷温度从等温凝固的函数的固定的枝晶尖端速度进行了比较与固定的尖端温度作为施加的定向凝固过程中获得的拉速的函数。我们得到了一个很好的定量协议之间的两个不同的速度过冷度函数。这表明，该模型提供了一个自洽的描述凝固。最后，根据Inconel 718单晶铸造实验中发现的实验凝固条件对模拟结果进行了讨论。
We develop a phase field model for the simulation of chemical diffusion-limited solidification in complex metallic alloys. The required thermodynamic and kinetic input information is obtained from CALPHAD calculations using the commercial software-package ThermoCalc. Within the case study on the nickel-base superalloy Inconel 718, we perform simulations of solidification with the explicit consideration of 6 different chemical elements. The stationary dendritic tip velocities as functions of the constant undercooling temperature obtained from isothermal solidification are compared with the stationary tip temperatures as functions of the imposed pulling velocity obtained during directional solidification. We obtain a good quantitative agreement between the two different velocityundercooling functions. This indicates that the model provides a self consistent description of the solidification. Finally, the simulation results are discussed in light of experimental solidification conditions found in single crystalline casting experiments of Inconel 718.