Anisotropic Stress Rupture Properties of a 3rd-Generation Nickel-Based Single-Crystal Superalloy at 1100 °C/150 MPa

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	Anisotropic Stress Rupture Properties of a 3rd-Generation Nickel-Based Single-Crystal Superalloy at 1100 °C/150 MPa
	Li Yifei; Wang Li; Zhang Gong; Qi Dongqing; Du Kui; Lou Langhong
刊名	Acta Metallurgica Sinica(English Letters)
	2020
卷号	33 期号:3 页码:446-458
关键词	Single-crystal superalloy Stress rupture Anisotropy Microstructure Dislocation
ISSN号	1006-7191
英文摘要	The influence of orientation on the stress rupture behaviors of a 3rd-generation nickel-based single-crystal superalloy was investigated at 1100 °C/150 MPa.It is found that the stress rupture anisotropy is shown at 1100 °C, but not so obvious compared with that at intermediate temperatures.The 001 specimens display the longest rupture life, 111 specimens show the shortest rupture life, and 011 specimens exhibit the intermediate life.Detailed observations show that the final fracture is caused by crack initiation and propagation, and the anisotropy of three oriented specimens is related to the fracture modes, γ / γ ? microstructures, interfacial dislocation networks and cutting mechanisms in γ ? phase.For 001 specimens,N -type rafted structures are formed which can well hinder the slip and climb of dislocations.Besides, the regular interfacial dislocation networks can prevent dislocations from cutting into γ ? phase, leading to the improvement of the creep resistance.For 011 specimens, ± 45° rafted structures and irregular networks result in less strain hardening.For 111 specimens, a large number of crack propagation paths and inhomogeneous deformations caused by irregular rafted structures deteriorate the property and result in the shortest life.Furthermore, a 100 superdislocations with low mobility are widely formed in 001 and 011 specimens which suggests the low creep strain rate during steady creep stage, whereas superdislocations in 111 specimens possess high mobility, which indicates the high strain rate and corresponding poor stress rupture property.
语种	英语
CSCD记录号	CSCD:6667168
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/152130]
专题	金属研究所_中国科学院金属研究所
作者单位	中国科学院金属研究所
推荐引用方式 GB/T 7714	Li Yifei,Wang Li,Zhang Gong,et al. Anisotropic Stress Rupture Properties of a 3rd-Generation Nickel-Based Single-Crystal Superalloy at 1100 °C/150 MPa[J]. Acta Metallurgica Sinica(English Letters),2020,33(3):446-458.
APA	Li Yifei,Wang Li,Zhang Gong,Qi Dongqing,Du Kui,&Lou Langhong.(2020).Anisotropic Stress Rupture Properties of a 3rd-Generation Nickel-Based Single-Crystal Superalloy at 1100 °C/150 MPa.Acta Metallurgica Sinica(English Letters),33(3),446-458.
MLA	Li Yifei,et al."Anisotropic Stress Rupture Properties of a 3rd-Generation Nickel-Based Single-Crystal Superalloy at 1100 °C/150 MPa".Acta Metallurgica Sinica(English Letters) 33.3(2020):446-458.