单晶叶片高效Z形选择器的开发及相应的晶粒选择机制

Development of a High-Efficiency Z-Form Selector for Single Crystal Blades and Corresponding Grain Selection Mechanism.

作者信息

Zhu Xintao, Wang Fu, Ma Dexin, Bührig-Polaczek Andreas

机构信息

Foundry Institute, RWTH Aachen University, Intzestrasse 5, 52072 Aachen, Germany.

State Key Laboratory for Manufacturing System Engineering, School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China.

出版信息

Materials (Basel). 2019 Mar 7;12(5):780. doi: 10.3390/ma12050780.

DOI:10.3390/ma12050780

PMID:30866436

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6427589/

Abstract

Single crystal (SX) is widely used in modern turbine blades to improve the creep fracture, fatigue, oxidation, and coating properties of the turbine, so that the turbine engine has excellent performance and durability. In this paper, the single crystal super alloy MM247LC is used as the research material. The evolution of grain structure in a two-dimensional grain selector was studied by directional experiments, and the mechanism of grain selection in the two-dimensional channel during directional solidification was clarified. In order to optimize the production process of single crystal turbine blades, the effects of the geometrical structure of a Z-type separator (i.e., wire diameter and take-off angle) on the crystal orientation, microstructure, and grain efficiency of blades were discussed.

摘要

单晶（SX）广泛应用于现代涡轮叶片，以改善涡轮的蠕变断裂、疲劳、氧化和涂层性能，从而使涡轮发动机具有优异的性能和耐久性。本文以单晶高温合金MM247LC作为研究材料。通过定向实验研究了二维晶粒选择器中晶粒结构的演变，并阐明了定向凝固过程中二维通道内的晶粒选择机制。为了优化单晶涡轮叶片的生产工艺，讨论了Z型分离器的几何结构（即丝径和引出角）对叶片晶体取向、微观结构和晶粒效率的影响。