Study on the preparation and microstructure of a single-crystal hollow turbine blade. Issue 16 (10th December 2017)

• Record Type: Journal Article
• Authors: Liang, Xiangfeng; Zhao, Yu-tao; Ma, Dexin; Jia, Zhihong; Meng, Xiangfeng
• Is Part Of: Materials and manufacturing processes. Volume 32:Issue 16(2017)
• Page Start: 1887
• Page End: 1892
• Publication Date: 2017-12-10
• Subjects: γ′ -- blade -- casting -- dendrites -- heat -- hollow -- phase -- superalloy -- treatment; Manufacturing processes -- Periodicals; Materials -- Periodicals; Manufactured Materials; 670.5
• DOI: 10.1080/10426914.2017.1291948
• Languages: English
• ISSNs: 1042-6914

Abstract

ABSTRACT: This paper studied the structural design of a ceramic core and a blade, ceramic core localization, shell preparation, casting process, core leaching technology, and the heat treatment process of a single-crystal hollow turbine blade. The results show that the single-crystal structure solidification sequence of the blade platform is consistent with the cooling sequence and the pulling-out direction of the blade. The primary dendrites were obviously enlarged with the increase of the blade thickness owing to the change in the local cooling rate. Besides, the γ′ phase had a high uniform size distribution ranging from 0.40 to 0.60 µm after heat treatment, and the cubic degree was more homogeneous in comparison with the as-cast microstructure, which are favorable for the superalloy structure. Moreover, γ′ phase size gradually increased and its quantity gradually reduced owing to the increase of the wall thickness in the growth direction.