2-D Selector Simulation Studies on Grain Selection for Single Crystal Superalloy of CM247LC.

Hang Zhang,Xintao Zhu,Fu Wang,Dexin Ma

doi:10.3390/ma12233829

Hang Zhang, Xintao Zhu + Show 2 more

Open Access

https://doi.org/10.3390/ma12233829

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Journal: Materials	Publication Date: Nov 21, 2019
Citations: 3	License type: CC BY 4.0

Affiliation: Xi'an Jiaotong University, RWTH Aachen University

Abstract

In the present work, the single crystal superalloy CM247LC was selected as the research material. By using directional experiments and the cellular automaton finite element (CAFE) model, the process of grain texture evolution in a two-dimensional grain selector was investigated to clarify the mechanism of grain selection in the two-dimensional passage during the process of directional solidification (DS). To optimize single crystal turbine blade production processes, the effects of grain selector geometries (i.e., selector diameter and pitch length, take-off angle) on the microstructure and stray grain were simulated and discussed.

Highlights

Ni-based components are used widely in the hot ends of aero-engines and gas industrial turbines (GITs) due to their excellent performance at high temperatures [1]
SX (Single Crystal) components are conventionally produced by using the directional solidification process
The seeding method can precisely control the orientation of the SC component, it can cause the occurrence of casting defects, and the operation of this method is inconvenient in practice

Summary

Introduction

Ni-based components are used widely in the hot ends of aero-engines and gas industrial turbines (GITs) due to their excellent performance at high temperatures [1]. SX (Single Crystal) components are conventionally produced by using the directional solidification process. In this process, the seeding and selector methods are employed. The seeding method can precisely control the orientation of the SC component, it can cause the occurrence of casting defects, and the operation of this method is inconvenient in practice. The selector method is usually used in industrial applications, but for some high-requirement SC casting, a combination of both methods is applied [2,3,4]. The previous investigation indicates that the smaller wire diameter, the more efficient spiral selector becomes. If the selector diameter is too small, the spiral selector is not strong enough to support the SC casting. The cost of the model for injecting the 3D selector is high and the operation process is complex

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