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Transactions of Nonferrous Metals Society of China 2011年第7期21卷 1532-1537页

作者：田素贵梁福顺黎阿男李晶晶钱本江沈阳工业大学材料科学与工程学院沈阳110870

By means of microstructure observation and measurement of creep properties,the high temperature creep behaviors of a single crystal nickel-based superalloy containing Re were *** show that the single crystal nickel-based superalloy containing 4.2% Re possesses a better creep resistance at high *** being crept up to fracture,the various morphologies are displayed in the different areas of the sample,and the γ＇ phase is transformed into the rafted structure along the direction vertical to the applied stress axis in the regions far from the *** the coarsening and twisting extents of the rafted γ＇ phase increase in the regions near the fracture,which is attributed to the occurrence of the larger plastic *** the later stage of creep,the deformation mechanism of the alloy is that the dislocations with [01^-1]and [011] trace features shear into the rafted γ＇ *** main/secondary slipping dislocations are alternately activated to twist the rafted γ＇ phase up to the occurrence of creep fracture,which is thought to be the fracture mechanism of the alloy during creep.

关键词： single crystal nickel-based superalloy Re creep microstructure evolution deformation mechanism

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Creep feed grinding induced gradient microstructures in the superficial layer of turbine blade root of single crystal nickel-based superalloy

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International Journal of Extreme Manufacturing 2021年第4期3卷 89-102页

作者： Qing Miao Wenfeng Ding Jiuhua Xu Lijie Cao Hongcai Wang Zhen Yin Chenwei Dai Weijie Kuang National Key Laboratory of Science and Technology on Helicopter Transmission Nanjing University of Aeronautics and AstronauticsNanjing 210016People’s Republic of China College of Mechanical Engineering Suzhou University of Science and TechnologySuzhou 215009People’s Republic of China Institute for Materials Ruhr-Universität BochumBochum 44801Germany

The service performance of the turbine blade root of an aero-engine depends on the microstructures in its superficial *** work investigated the surface deformation structures of turbine blade root of single crystal nickel-based superalloy produced under different creep feed grinding *** microstructures in the superficial layer were clarified and composed of a severely deformed layer(DFL)with nano-sized grains(48–67 nm)at the topmost surface,a DFL with submicron-sized grains(66–158 nm)and micron-sized laminated structures at the subsurface,and a dislocation accumulated layer extending to the bulk *** formation of such gradient microstructures was found to be related to the graded variations in the plastic strain and strain rate induced in the creep feed grinding process,which were as high as 6.67 and 8.17×10^(7)s^(−1),*** the current study,the evolution of surface gradient microstructures was essentially a transition process from a coarse single crystal to nano-sized grains and,simultaneously,from one orientation of a single crystal to random orientations of polycrystals,during which the dislocation slips dominated the creep feed grinding induced microstructure deformation of single crystal nickel-based superalloy.

关键词： gradient microstructure creep feed grinding single crystal nickel-based superalloy dislocation

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Influence of Solution Temperature on Compositions Segregation and Creep Behavior of a single crystal nickel-based superalloy

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Influence of Solution Temperature on Compositions Segregatio...

Deformation and damage features of a Re/Ru-containing single crystal nickel base superalloy during creep at elevated temperature

中国材料大会2012

作者： S.G. Tian Y.C. Xue Z. Zeng School of Materials Science and Engineering Shenyang University of Technology

ISBN: (纸本)9783037856086;3037856084

By means of solution treatment at various temperatures, creep properties measurement and microstructure observation, the effects of heat treatment on composition segregation and creep properties were investigated. Results show that the various segregation extents of the elements are displayed in the alloys solution treated at different temperatures, and the segregation extent of the elements is improved with the solution temperature elevated, which may obvious improve the creep resistance of the alloy. And no rafted structure of the γ’ phase is detected in the alloy during creep at medium temperature. The deformation features of the alloy during creep at medium temperature are that the slipping of dislocations is activated in the γ matrix channels, and dislocations shearing into the γ’ phase may be decomposed to form the configuration of partials + stacking faults, which may hinder the cross-slipping of the dislocations to improve the creep resistance of the alloy.

关键词： single crystal nickel-based superalloy Creep Deformation mechanism Microstructure evolution Dislocation

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Progress in Natural Science:Materials International 2019年第2期29卷 210-216页

作者： Guoqi Zhao Sugui Tian Shunke Zhang Ning Tian Lirong Liu School of Mechanical Engineering Guizhou University of Engineering Science School of Materials Science and Engineering Shenyang University of Technology

The deformation and damage features of a 4.5%Re/3.0%Ru-containing single crystal nickel-based superalloy during the creep in the temperature range of 1040–1070 °C and stress range of 137–180 MPa was investigated by means of creep properties measurement and contrast analysis of dislocation configuration. The results showed that the alloy exhibited a better creep resistance in the range of the testing temperatures and stresses, the deformation mechanism of the alloy during steady state creep was dislocations climbing over the rafted γ′ *** the latter period of creep, the deformation mechanism of the alloy was dislocations shearing into the rafted γ′phase. It is believed that the dislocations shearing into γ′ phase may cross-slip from {111} to {100} planes for forming the K-W locks to restrain the slipping and cross-slipping of dislocations on {111} plane. As the creep goes on, the alternate slipping of dislocations results in the twisted of the rafted γ′ phase to promote the initiation and propagation of cracks along the γ/γ′ interfaces up to creep fracture, which is considered to be the damage and fracture feature of alloy during creep at high temperature.

关键词： Re/Ru alloying single crystal nickel-based superalloy Creep Dislocations climbing K-W locks

Grinding force and surface quality in creep feed profile grinding of turbine blade root of nickel-based superalloy with microcrystalline alumina abrasive wheels

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Chinese Journal of Aeronautics 2021年第2期34卷 576-585页

作者： Qing MIAO Wenfeng DING Weijie KUANG Changyong YANG National Key Laboratory of Science and Technology on Helicopter Transmission Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Creep feed profile grinding of the fir-tree blade root forms of single crystal nickel-based superalloy was conducted using microcrystalline alumina abrasive wheels in the present study. The grinding force and the surface quality in terms of surface topography, subsurface microstructure,microhardness and residual stress obtained under different grinding conditions were evaluated comparatively. Experimental results indicated that the grinding force was influenced significantly by the competing predominance between the grinding parameters and the cross-sectional root workpiece profile. In addition, the root workpiece surface, including the root peak and valley regions, was produced with the large difference in surface quality due to the nonuniform grinding loads along the root workpiece profile in normal section. Detailed results showed that the surface roughness, subsurface plastic deformation and work hardening level of the root valley region were higher by up to25%, 20% and 7% in average than those obtained in the root peak region, respectively, in the current investigation. Finally, the superior parameters were recommended in the creep feed profile grinding of the fir-tree blade root forms. This study is helpful to provide industry guidance to optimize the machining process for the high-valued parts with complicated profiles.

关键词： Creep feed profile grinding Fir-tree blade root Grinding force single crystal nickel-based superalloy Surface quality

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