Phase-Field Modeling of Precipitation Growth and Ripening During Industrial Heat Treatments in Ni-Base Superalloys
Phase-Field Modeling of Precipitation Growth and Ripening During Industrial Heat Treatments in Ni-Base Superalloys
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DOI：
10.1007/s11661-018-4746-5
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发表时间：
2018-09-01
影响因子：
2.8
通讯作者：
Glatzel, Uwe
中科院分区：
文献类型：
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作者：
Fleck, Michael;Schleifer, Felix;Glatzel, Uwe
我们发展了一个相场模型来模拟化学扩散限制的微观组织演化，特别关注多元合金中的析出长大和成熟。此外，该模型还考虑了由析出粒子和母体基质相之间的晶格失配引起的弹性效应。为了能够在一维上模拟粒子的生长和成熟，我们引入了一个额外的可选的驱动力项，它在一维上模拟了弯曲界面的影响。作为一个实例，我们研究了多元镍基高温合金CMSX-4在实际多步热处理影响下的一维(1D)γ‘析出长大和熟化过程。所需的与温度相关的热力学和动力学输入参数是使用商业软件包ThermoCalc从CALPHAD计算中获得的。所需的与温度相关的弹性参数是在金属和合金主席的内部测量的，使用共振超声光谱分析和高温X射线偏转。最后，应用该模型计算了周期边界条件下单个伽马粒子的平衡形状。讨论了热处理后的实验组织与伽马粒子形状的关系。
We develop a phase-field model for the simulation of chemical diffusion limited microstructure evolution, with a special focus on precipitation growth and ripening in multicomponent alloys. Further, the model accounts for elastic effects, which result from the lattice-misfit between the precipitate particles and the parent matrix phase. To be able to simulate particle growth and ripening in one dimension, we introduce an extra optional driving-force term, which mimics the effect of curved interfaces in one dimension. As a case study, we consider the one-dimensional (1D) gamma'-precipitation growth and ripening under the influence of a realistic multistep heat treatment in the multicomponent Ni-based superalloy CMSX-4. The required temperature-dependent thermodynamic and kinetic input parameters are obtained from CALPHAD calculations using the commercial software-package ThermoCalc. The required temperature-dependent elastic parameters are measured in-house at the chair of Metals and Alloys, using resonance ultrasound spectroscopy and high-temperature X-ray defraction. Finally, the model is applied to calculate the equilibrium shape of a single gamma'-particle with periodic boundary conditions. Relations to the shapes of gamma'-particles in respect of heat-treated experimental microstructures are discussed.