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3D-Modelling of thermo-mechanically and thermo-chemically coupled microstructural changes in high-temperature nickel-base superalloys

高温镍基高温合金热机械和热化学耦合微观结构变化的 3D 建模

基本信息

批准号：
282253287
负责人：
Professor Dr.-Ing. Hans Jürgen Maier
金额：
--
依托单位：
Institut für Werkstoffkunde (IW)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/282253287?language=en
关键词：
3D Modelling thermo mechanically chemically

项目摘要

The proposal presents a tightly integrated combination and enhancement of experimental and numerical methods aiming at an improved understanding of creep in polycrystalline nickel-based superalloys. Focus of the initial study was on the acquisition of crystal orientation in superalloys and, therefore, an appropriate physics-based crystal plasticity grain model was developed. A numerical framework is outlined on two scales that attempts to capture the effect of: 1) a rafting γ/γ´-microstructure on creep properties at the grain scale and 2) grain boundary (GB) type and slip orientations on grain boundary failure. A full 3D crystal plasticity rafting model is described which will be calibrated by creep curves and micrographs (scanning and transmission electron microscopy) from single crystals with similar y/y´-microstructure as observed in polycrystalline IN738LC. The rafting model, based on the extended finite element method (XFEM) in conjunction with level sets, will yield physics-based data to creep anisotropy on the grain scale. By means of deformation-tracking electron backscatter diffraction (EBSD) measurements and high temperature digital image correlation (DIC), GB type will be correlated to GB failure and strength. The correlation serves as input to the extension of the grain scale model to intergranular failure. X-ray microscopy, including bulk grain orientation and 3D grain geometry, will generate data for the validation of the grain model.

该提案提出了一个紧密集成的组合和增强的实验和数值方法，旨在提高多晶镍基高温合金蠕变的理解。最初的研究重点是在高温合金中的晶体取向的获取，因此，开发了一个适当的基于物理的晶体塑性晶粒模型。在两个尺度上概述了一个数值框架，试图捕捉以下因素的影响：1）在晶粒尺度上筏形γ/γ ′-微观结构对蠕变性能的影响; 2）晶界（GB）类型和滑移方向对晶界失效的影响。描述了一个完整的三维晶体塑性漂流模型，该模型将通过蠕变曲线和显微照片（扫描和透射电子显微镜）从具有与多晶IN 738 LC中观察到的相似y/y ′-显微结构的单晶中进行校准。基于扩展有限元法（XFEM）结合水平集的漂流模型将产生基于物理的数据，以在晶粒尺度上的蠕变各向异性。通过变形跟踪电子背散射衍射（EBSD）测量和高温数字图像相关（DIC），将GB类型与GB失效和强度关联起来。的相关性作为输入扩展的晶粒尺度模型的晶间破坏。X射线显微镜，包括散装晶粒取向和三维晶粒几何形状，将产生数据的晶粒模型的验证。