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
Source Publication	ACTA METALLURGICA SINICA-ENGLISH LETTERS
Volume	33 Issue:3 Pages:446-458
Abstract	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 ID	WOS:000515358900012
Citation statistics	Cited Times:4[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.imr.ac.cn/handle/321006/155713
Collection	中国科学院金属研究所
Recommended Citation 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.

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