Although advanced solidification processes like high temperature brazing have gained more and more industrial importance, they still are often not well understood, and defining optimal process conditions for practical use in many cases can be achieved only by expensive experimental trial and error methods. On the other hand, the phase-field method has become more and more powerful for the simulation of solidification and phase transformations in technical alloys. This paper presents phase-field simulations for high temperature brazing of the Ni-base superalloy Mar-M247 using a Si-based AMS4782 filler. The applied phase-field model can be online-coupled to Calphad databases which deliver the thermodynamic and mobility data for this complex multicomponent multiphase alloy. Unknown or uncertain physical parameters like diffusion coefficients have been calibrated by comparing to optical micrographs and EDX element mappings obtained from laboratory braze experiments for the same material combination. By variation of the process conditions the effects of the brazing temperature, the brazing time, and the thickness of the braze gap on precipitation of brittle phases and formation of stray grains as well as changes in the microstructure of the base material itself have been systematically investigated. Results are presented and discussed.

尽管诸如高温钎焊之类的先进固化工艺在工业上已变得越来越重要，但它们仍常常未被很好地理解，并且在许多情况下，为实际使用确定最佳工艺条件只能通过昂贵的试验和错误方法来实现。另一方面，相场法在模拟工业合金的凝固和相变方面变得越来越强大。本文介绍了使用基于Si的AMS4782填料对Ni基高温合金Mar-M247进行高温钎焊的相场模拟。可以将应用的相场模型在线耦合到Calphad数据库，该数据库为该复杂的多组分多相合金提供热力学和迁移率数据。未知或不确定的物理参数（如扩散系数）已通过与光学显微照片和从实验室钎焊实验获得的相同材料组合的EDX元素图进行比较进行了校准。通过改变工艺条件，系统地研究了钎焊温度，钎焊时间和钎焊间隙厚度对脆性相的析出和杂散晶粒的形成以及基材本身的微观结构变化的影响。 。结果介绍和讨论。并且系统地研究了脆性相的析出，杂散晶粒的形成中的钎焊间隙的厚度以及基体自身的微观结构的变化。结果介绍和讨论。并且系统地研究了脆性相的析出，杂散晶粒的形成中的钎焊间隙的厚度以及基体自身的微观结构的变化。结果介绍和讨论。