Effect of Ta on the Microstructure and Creep Properties of a Hot-Corrosion Resistant Ni-Based Single-Crystal Superalloy After Long-Term Exposure

doi:10.11900/0412.1961.2022.00349

IMR OpenIR

	Effect of Ta on the Microstructure and Creep Properties of a Hot-Corrosion Resistant Ni-Based Single-Crystal Superalloy After Long-Term Exposure
	Liu Jing 1,2,3; Zhang Siqian 1; Wang Dong 2; Wang Li 2; Chen Lijia 1
通讯作者	Zhang Siqian(sqzhang@alum.imr.ac.cn)
	2024-02-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	60 期号:2 页码:179-188
摘要	Innovative, massive gas turbines have emerged as critical equipment for achieving the goals of energy conservation and the development of new clean energy sources. As the inlet temperature of industrial gas turbines continues to rise, the high-temperature capabilities of hot corrosion-resistant single-crystal turbine blades should be enhanced. This work investigates the effects of Ta on the microstructural stability and creep properties of hot corrosion-resistant Ni-based single-crystal superalloys with varying Ta contents (2Ta, 5Ta, and 8Ta) during long-term thermal exposure at 900 degrees C. The findings revealed that after various thermal exposure times, the addition of Ta had no observable influence on the size of gamma' precipitates, but it considerably increased the cubic degree of gamma' precipitates and continuously decreased the number of tertiary g' precipitates in gamma matrix. With the increase of Ta content from 2% to 5%, the volume fraction of g' precipitates of 5Ta alloy is higher than that of 2Ta alloy except that which is close to each other when thermal exposure at 4000 h. In addition, the volume fraction of g' precipitates increased was higher than that of 2Ta and 5Ta alloys, as the Ta content increased from 5% to 8% after various thermal exposure times. The creep lives of the three alloys at 900 degrees C and 275 MPa exhibited different trends as thermal exposure time increased; there was no obvious fluctuation in the 2Ta alloy after thermal exposure from 0 to 4000 h, but it significantly decreased after thermal exposure at 8000 h; the creep lives of the 5Ta and 8Ta alloys increased initially and then decreased, and the peak creep lives were 500 and 2000 h, respectively. With the addition of Ta, the steady-state creep rate continuously decreased, the creep life significantly increased, and the peak creep life shifted backward. Simultaneously, the degree and structural integrity of the rafted gamma' precipitates after creep rupture increased steadily. Hence, the improvement of the creep life of the alloys was attributed to a combination of factors, such as the increase in the volume fraction of the g' precipitates in the initial state of the creep, the increase in rafted structural integrity, and thickness of the rafted gamma' precipitates during the creep process.
关键词	Ta Ni-based single-crystal superalloy long-term thermal exposure long-term creep
资助者	National Natural Science Foundation of China ; National Science and Technology Major Project ; Science Center for Gas Turbine Project
DOI	10.11900/0412.1961.2022.00349
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51631008] ; National Natural Science Foundation of China[52071219] ; National Science and Technology Major Project[J2019-IV-0006-0074] ; National Science and Technology Major Project[2017-VI-0019-0091] ; National Science and Technology Major Project[J2019-VI-0010-0124] ; Science Center for Gas Turbine Project
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001153599200005
出版者	SCIENCE PRESS
引用统计	被引频次：1[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/321006/184041
专题	中国科学院金属研究所
通讯作者	Zhang Siqian
作者单位	1.Shenyang Univ Technol, Sch Mat Sci & Engn, Shenyang 110870, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 3.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Liu Jing,Zhang Siqian,Wang Dong,et al. Effect of Ta on the Microstructure and Creep Properties of a Hot-Corrosion Resistant Ni-Based Single-Crystal Superalloy After Long-Term Exposure[J]. ACTA METALLURGICA SINICA,2024,60(2):179-188.
APA	Liu Jing,Zhang Siqian,Wang Dong,Wang Li,&Chen Lijia.(2024).Effect of Ta on the Microstructure and Creep Properties of a Hot-Corrosion Resistant Ni-Based Single-Crystal Superalloy After Long-Term Exposure.ACTA METALLURGICA SINICA,60(2),179-188.
MLA	Liu Jing,et al."Effect of Ta on the Microstructure and Creep Properties of a Hot-Corrosion Resistant Ni-Based Single-Crystal Superalloy After Long-Term Exposure".ACTA METALLURGICA SINICA 60.2(2024):179-188.