Effect of wall thickness on the microstructure and properties of a fourth-generation single crystal superalloy

doi:10.1016/j.jallcom.2024.176437

IMR OpenIR

	Effect of wall thickness on the microstructure and properties of a fourth-generation single crystal superalloy
	Jiang, Kuo 1; Liu, Jinlai 2; Sheng, Naicheng 2; Li, Qi 2; Fan, Donghan 2; Qiu, Keqiang 1; Ren, Yinglei 1; Li, Jinguo 2
通讯作者	Liu, Jinlai(jlliu@imr.ac.cn) ; Ren, Yinglei(yinglren@163.com) ; Li, Jinguo(jgli@imr.ac.cn)
	2024-12-05
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
ISSN	0925-8388
卷号	1007 页码:11
摘要	This study investigated the effect of various thicknesses (0.3-1.5 mm) on the as-cast and heat-treated microstructures of the fourth-generation single crystal superalloy. The microstructures and fracture characteristics of samples with various thicknesses were analyzed after high-temperature stress rupture tests at 1100 degree celsius/137 MPa. The results showed that as the alloy thickness increased from 0.3 mm to 1.5 mm, the degree of segregation between dendritic core and inter-dendritic significantly increased. The increased segregation was attributed to the slower solidification rate of the 1.5 mm-thick sample compared to the 0.3 mm-thick sample. Lower solidification rates and higher degrees of dendritic segregation enhanced the area fraction of eutectics, the primary dendrite arm spacing (PDAS), the and area fraction of pores. After stress rupture tests, the rupture life of the alloy increased from 81 h to 333 h. It was observed that in the 0.3 mm-thick sample, microcracks initiated at the surface and extended into the matrix. On the contrary, as for the 1.5 mm-thick sample, microcracks initiated at the matrix and propagated towards the surface. To evaluate the influence of oxidation, interrupted stress rupture tests were conducted in air atmosphere to investigate the thickness debit effect. Surface oxidation led to the initiation of microcracks on the surface and change the morphology and area fraction of the internal gamma ' phase, as well as the effective load-bearing area of the samples. TEM and EBSD were employed to characterize the deformation characteristics of samples with various thicknesses, and the influence of thickness on deformation mechanisms was discussed as well.
关键词	Nickel-based superalloy Wall thickness Microstructure Mechanical properties
资助者	National Science and Technology Major Project ; Science Center for Gas Turbine Project
DOI	10.1016/j.jallcom.2024.176437
收录类别	SCI
语种	英语
资助项目	National Science and Technology Major Project[2019-VII-0019-0161] ; Science Center for Gas Turbine Project[P2021-A-IV-001-002]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001316300100001
出版者	ELSEVIER SCIENCE SA
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/321006/190025
专题	中国科学院金属研究所
通讯作者	Liu, Jinlai; Ren, Yinglei; Li, Jinguo
作者单位	1.Shenyang Univ Technol, Sch Mat Sci & Engn, Shenyang 110870, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shi changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Jiang, Kuo,Liu, Jinlai,Sheng, Naicheng,et al. Effect of wall thickness on the microstructure and properties of a fourth-generation single crystal superalloy[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2024,1007:11.
APA	Jiang, Kuo.,Liu, Jinlai.,Sheng, Naicheng.,Li, Qi.,Fan, Donghan.,...&Li, Jinguo.(2024).Effect of wall thickness on the microstructure and properties of a fourth-generation single crystal superalloy.JOURNAL OF ALLOYS AND COMPOUNDS,1007,11.
MLA	Jiang, Kuo,et al."Effect of wall thickness on the microstructure and properties of a fourth-generation single crystal superalloy".JOURNAL OF ALLOYS AND COMPOUNDS 1007(2024):11.