Thin-walled effect of microstructure of third-generation single crystal superalloy DD9

YANG Wanpeng; LI Jiarong; LIU Shizhong; ZHAO Jinqian; WANG Xiaoguang; YANG Liang; WANG Rui; CHEN Qiao

doi:10.11868/j.issn.1001-4381.2024.000210

Cailiao gongcheng (Jan 2025)

Thin-walled effect of microstructure of third-generation single crystal superalloy DD9

YANG Wanpeng,
LI Jiarong,
LIU Shizhong,
ZHAO Jinqian,
WANG Xiaoguang,
YANG Liang,
WANG Rui,
CHEN Qiao

Affiliations

YANG Wanpeng: Key Laboratory of Advanced High Temperature Structural Materials， AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China
LI Jiarong: Key Laboratory of Advanced High Temperature Structural Materials， AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China
LIU Shizhong: Key Laboratory of Advanced High Temperature Structural Materials， AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China
ZHAO Jinqian: Key Laboratory of Advanced High Temperature Structural Materials， AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China
WANG Xiaoguang: Key Laboratory of Advanced High Temperature Structural Materials， AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China
YANG Liang: Key Laboratory of Advanced High Temperature Structural Materials， AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China
WANG Rui: Key Laboratory of Advanced High Temperature Structural Materials， AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China
CHEN Qiao: Key Laboratory of Advanced High Temperature Structural Materials， AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China

DOI: https://doi.org/10.11868/j.issn.1001-4381.2024.000210
Journal volume & issue: Vol. 53, no. 1
pp. 55 – 64

Abstract

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The microstructure and thin-walled effect of different samples （double-wall ultra-cooling turbine blades， combined cooling turbine blades， investment casting thin-walled specimen， and round bar specimen） of the third-generation single crystal superalloy DD9 are investigated by optical microscope， field emission scanning electron microscope， and electron probe apparatus. The results show that there are differences in the microstructures of the four specimens. When the section sizes are the same， the as-cast primary dendrite arm spacing， the sizes of γ′ phases， and the dendrite segregation of the as-cast and heat- treated specimens of DD9 single crystal turbine blades are all larger than those of the investment casting thin-walled specimens. After full heat treatment， the sizes of the γ′ phases of single crystal turbine blades with the same cross-sectional size are similar to those of investment casting thin-walled specimens. The as-cast primary dendrite arm spacing， the sizes of γ′ phases， and the dendrite segregation of the as-cast and heat-treated thin-walled specimens of DD9 alloy all decrease with the decrease of the cross-sectional size.

Published in Cailiao gongcheng

ISSN: 1001-4381 (Print)
Publisher: Journal of Materials Engineering
Country of publisher: China
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: http://jme.biam.ac.cn/CN/1001-4381/home.shtml

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