Investigation of the Undercoolability of Ni-Based Alloys Using High Temperature Thermal Analysis

Metals

Samuel Bogner¹  Elvira Ivanova²  Marcel Müller²  Fu Wang²  Dexin Ma²  Andreas Bührig-Polaczek² 

[1] Foundry-Institute, Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen University, Intzestraße 5, 52072 Aachen, Germany;

关键词: Ni-based;    superalloys;    undercooling;    shell mold;    temperature measurement;    stray grains;   

DOI  :  10.3390/met5041971

来源: mdpi

【 摘 要 】

During the single crystal (SX) solidification of turbine blades, grain defects can form in the platform regions which have abruptly varying cross-sections. A high undercoolability of a Ni-based alloy prevents the growth of stray grains in the thermally undercooled platform area. To evaluate the undercoolability of different Ni-based alloys, temperature measurements were conducted using the same thermal conditions in an Al₂O₃-SiO₂ investment casting shell mold system. Furthermore, the results were compared with stray grains in directionally solidified components.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.