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

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Li Yifei 1,2   Wang Li 1   Zhang Gong 1   Qi Dongqing 1   Du Kui 1   Lou Langhong 1  
文摘 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 ʹ microstructures, interfacial dislocation networks and cutting mechanisms in γ ʹ 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 ʹ 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.
来源 Acta Metallurgica Sinica(English Letters) ,2020,33(3):446-458 【核心库】
DOI 10.1007/s40195-019-00931-1
关键词 Single-crystal superalloy ; Stress rupture ; Anisotropy ; Microstructure ; Dislocation
地址

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016  

2. School of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026

语种 英文
文献类型 研究性论文
ISSN 1006-7191
学科 金属学与金属工艺
基金 国家自然科学基金 ;  国家科技攻关计划项目
文献收藏号 CSCD:6667168

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