Precipitation of eta phase and its effects on stress rupture properties of K4750 alloy

doi:10.1016/j.msea.2019.138137

CORC > 金属研究所 > 中国科学院金属研究所

	Precipitation of eta phase and its effects on stress rupture properties of K4750 alloy
	Hou, Kunlei 1,2; Ou, Meiqiong 1; Wang, Min 1; Li, Haoze 1; Ma, Yingche 1; Liu, Kui 1
刊名	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	2019-08-19
卷号	763 页码:11
关键词	Ni-base superalloy eta Phase MC degradation Stress rupture properties
ISSN号	0921-5093
DOI	10.1016/j.msea.2019.138137
通讯作者	Ma, Yingche(ycma@imr.ac.cn) ; Liu, Kui(kliu@imr.ac.cn)
英文摘要	The precipitation of eta phase and its effects on stress rupture properties of K4750 alloy were investigated. During aging at 850 degrees C for 50-500 h, thin plate-like eta phase were firstly precipitated at grain boundaries (GBs) and around MC carbides, then grew into grain interiors to form a Widmanstadter morphology. The ri phase around MC carbides was considered to be the product of MC degradation which was in reaction of MC + gamma -> M23C6 t eta The eta phase had an orientation relationship with gamma matrix: {0001}(eta)//{111}gamma, < 11<(2)over bar>0 >(eta) // < 1<(1)over bar>0 >gamma. As the growth of phase, gamma' phase was absorbed by eta phase and led to the formation of gamma' precipitation free zones (PFZs). This was mainly because both gamma' and t phases were enriched in Ti and Ni, and the dissolution of gamma' released Ti and Ni for the formation of n phase. As the aging time prolonged, stacking faults (SFs) were induced in some coarsening gamma' phase. The SFs within gamma' offered sites for the nucleation of eta phase, which facilitated the formation of eta phase in grain interiors. To clarify the effects of eta phase on stress rupture properties, samples were carried out the standard heat treatment (SHT), SHT +850 degrees C/300 h and SHT + 850 C/300 h + SHT, respectively. And eta phase could only be observed in the sample having been subjected to SHT +850 degrees C/300 h. After above three heat treatments, the stress rupture life of K4750 alloy tested at 750 degrees C/360 MPa was 506.00 h, 99.55 h and 447.08 h, and the elongation was 13%, 22% and 8.7%, respectively. The change of stress rupture properties was closely related to the formation of eta phase and the degradation of MC carbides, which would be analyzed in this paper.
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000483456900003
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/135283]
专题	金属研究所_中国科学院金属研究所
通讯作者	Ma, Yingche; Liu, Kui
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Hou, Kunlei,Ou, Meiqiong,Wang, Min,et al. Precipitation of eta phase and its effects on stress rupture properties of K4750 alloy[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2019,763:11.
APA	Hou, Kunlei,Ou, Meiqiong,Wang, Min,Li, Haoze,Ma, Yingche,&Liu, Kui.(2019).Precipitation of eta phase and its effects on stress rupture properties of K4750 alloy.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,763,11.
MLA	Hou, Kunlei,et al."Precipitation of eta phase and its effects on stress rupture properties of K4750 alloy".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 763(2019):11.