The recovery of microstructure and mechanical properties of directionally solidified Ni-based superalloy DZ411 after long-term thermal exposure at different temperatures

doi:10.1016/j.msea.2023.145831

IMR OpenIR

	The recovery of microstructure and mechanical properties of directionally solidified Ni-based superalloy DZ411 after long-term thermal exposure at different temperatures
	Sun, Zishu 1,2; Jiang, Xiangwei 2; Zhan, Xin 1,2; Li, Kaiwen 2; Zheng, Wei 2; Jiang, Dongpo 3; Liu, Dahui 4; Dong, Jiasheng 2; Lou, Langhong 2
通讯作者	Jiang, Xiangwei(xwjiang@imr.ac.cn)
	2023-11-17
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	888 页码:11
摘要	Directionally solidified (DS) Ni-based superalloys are widely used in gas turbine blades due to excellent me-chanical properties for elevated temperature applications. In harsh service environments, the microstructure degrades and mechanical properties deteriorate. In order to extend the service life of gas turbine blades, reju-venation heat treatment (RHT) is applied. Considering the existence of temperature gradient in a real gas turbine blade during service, the effects of RHT on the different degraded microstructure at different temperatures are necessary to be investigated. However, few investigations concentrated on it. In this study, to simulate the ex-istence of temperature gradient in a real gas turbine blade during service, DS Ni-based superalloy DZ411 was carried out with long-term thermal exposure at different temperatures. The impact of RHT on the different degrees of degraded microstructure and mechanical properties after thermal exposure at different temperatures was explored. Furthermore, the evolution of dislocations after RHT is studied, which has been rarely investi-gated. It was found that the degenerated microstructure at different aging temperatures can be significantly restored by RHT, including dissolution and reprecipitation of gamma ' and M23C6 carbides and annihilation and rear-rangement of dislocations. In addition, creep and low cycle fatigue (LCF) properties could also be effectively recovered by RHT. After RHT, the steady-state creep rate is decreased and creep rupture life has been prolonged. The LCF life and the shape of the stabilized hysteresis loop are restored. However, the creep properties are not completely restored, due to the unrecovered microstructure including the undissolved gamma ' in interdendritic regions, the residual dislocations, and irreversible decomposition.
关键词	Rejuvenation heat treatment Recovery Microstructure Mechanical properties Thermal exposure
资助者	National Science and Technology Major Project ; Advanced Material Systems and Database for Gas Turbine
DOI	10.1016/j.msea.2023.145831
收录类别	SCI
语种	英语
资助项目	National Science and Technology Major Project[J2019-IV-0006-0074] ; National Science and Technology Major Project[J2019-VI-0020-0135] ; Advanced Material Systems and Database for Gas Turbine[J2019-VI-0009-0123]
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001104597900001
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/177223
专题	中国科学院金属研究所
通讯作者	Jiang, Xiangwei
作者单位	1.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Superalloys Div, Shenyang 110016, Peoples R China 3.Hadian Power Equipment Natl Engn Res Ctr Co Ltd, Harbin 150090, Peoples R China 4.ZhongJi Testing Co Ltd, Changchun 130103, Peoples R China
推荐引用方式 GB/T 7714	Sun, Zishu,Jiang, Xiangwei,Zhan, Xin,et al. The recovery of microstructure and mechanical properties of directionally solidified Ni-based superalloy DZ411 after long-term thermal exposure at different temperatures[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2023,888:11.
APA	Sun, Zishu.,Jiang, Xiangwei.,Zhan, Xin.,Li, Kaiwen.,Zheng, Wei.,...&Lou, Langhong.(2023).The recovery of microstructure and mechanical properties of directionally solidified Ni-based superalloy DZ411 after long-term thermal exposure at different temperatures.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,888,11.
MLA	Sun, Zishu,et al."The recovery of microstructure and mechanical properties of directionally solidified Ni-based superalloy DZ411 after long-term thermal exposure at different temperatures".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 888(2023):11.