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

doi:10.1007/s40195-019-00931-1

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	Anisotropic Stress Rupture Properties of a 3rd-Generation Nickel-Based Single-Crystal Superalloy at 1100 degrees C/150 MPa
	Li, Yi-Fei; Wang, Li; Zhang, Gong; Qi, Dong-Qing; Du, Kui; Lou, Lang-Hong
	2020-03-01
发表期刊	ACTA METALLURGICA SINICA-ENGLISH LETTERS
卷号	33 期号:3 页码:446-458
摘要	The influence of orientation on the stress rupture behaviors of a 3rd-generation nickel-based single-crystal superalloy was investigated at 1100 degrees C/150 MPa. It is found that the stress rupture anisotropy is shown at 1100 degrees 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, gamma/gamma MODIFIER LETTER PRIME microstructures, interfacial dislocation networks and cutting mechanisms in gamma MODIFIER LETTER PRIME 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 gamma MODIFIER LETTER PRIME phase, leading to the improvement of the creep resistance. For [011] specimens, +/- 45 degrees 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.
DOI	10.1007/s40195-019-00931-1
WOS记录号	WOS:000515358900012
引用统计	被引频次：12[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/321006/155713
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Li, Yi-Fei,Wang, Li,Zhang, Gong,et al. Anisotropic Stress Rupture Properties of a 3rd-Generation Nickel-Based Single-Crystal Superalloy at 1100 degrees C/150 MPa[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2020,33(3):446-458.
APA	Li, Yi-Fei,Wang, Li,Zhang, Gong,Qi, Dong-Qing,Du, Kui,&Lou, Lang-Hong.(2020).Anisotropic Stress Rupture Properties of a 3rd-Generation Nickel-Based Single-Crystal Superalloy at 1100 degrees C/150 MPa.ACTA METALLURGICA SINICA-ENGLISH LETTERS,33(3),446-458.
MLA	Li, Yi-Fei,et al."Anisotropic Stress Rupture Properties of a 3rd-Generation Nickel-Based Single-Crystal Superalloy at 1100 degrees C/150 MPa".ACTA METALLURGICA SINICA-ENGLISH LETTERS 33.3(2020):446-458.