Srinivasan Krishnanand, Gumenyuk Andrey, Rethmeier Michael
Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany.
SHW Brake Systems GmbH, Ludwigstal 25, 78532 Tuttlingen, Germany.
Micromachines (Basel). 2024 Sep 30;15(10):1234. doi: 10.3390/mi15101234.
New developments in nickel-based superalloys and production methods, such as the use of additive manufacturing (AM), can result in innovative designs for turbines. It is crucial to understand how the material behaves during the AM process to advance the industrial use of these techniques. An analytical model based on reaction-diffusion formalism is developed to better explain the solidification behavior of the material during laser metal deposition (LMD). The well-known Scheil-Gulliver theory has some drawbacks, such as the assumption of equilibrium at the solid-liquid interface, which is addressed by this method. The solidified fractions under the Scheil model and the pure equilibrium model are calculated using CALPHAD simulations. A differential scanning calorimeter is used to measure the heat flow during the solid-liquid phase transformation, the result of which is further converted to solidified fractions. The analytical model is compared with all the other models for validation.
镍基高温合金及生产方法的新进展，如增材制造（AM）的应用，可带来涡轮机的创新设计。了解材料在增材制造过程中的行为对于推进这些技术的工业应用至关重要。基于反应扩散形式主义开发了一个分析模型，以更好地解释激光金属沉积（LMD）过程中材料的凝固行为。著名的Scheil-Gulliver理论存在一些缺陷，如固液界面处的平衡假设，而该方法解决了这一问题。使用CALPHAD模拟计算了Scheil模型和纯平衡模型下的凝固分数。用差示扫描量热仪测量固液相变过程中的热流，其结果进一步转换为凝固分数。将该分析模型与所有其他模型进行比较以进行验证。
