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

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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

Hot Corrosion Behaviors of Ni-14%Cr Alloys in Molten Sulfate

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稀有金属材料与工程 2009年第A3期38卷 17-19页

作者： Lu Xudong tian sugui Shui Li Yu Xingfu Shenyang University of Technology Shenyang 110023 China Shenyang Ligong University Shenyang 110168 China

The corrosion behaviors and mechanism of Ni-14%Cr alloys in molten salt with Na2SO4 at 1000℃ was investigated by means of XRD analysis and SEM observation. Results show that the alloys were subjected to the accelerated corrosion in molten salt and the corrosion kinetic of the alloy obeys the parabolic law. On the other hand, the corrosion-resistance of the alloy could be improved significantly by increasing of chromium content. Corrosion products may be divided into three layers, i. e. NiCr2O4, CoCr2O4, CoNi2S4, AlWO3 and Al2O3 granule are included in the outside of the scales, the continuous Al2O3 layer is localed in intermediate layer, and the sulfides is in the internal layer. The Cr2S3 phase in Ni-14Cr prevents the S and O from the matrix of the alloy. The morphology examinations tend to support the sulphidization-basic dissolution model previously proposed for hot corrosion mechanism.

关键词：腐蚀行为镍 X射线衍射分析合金

Microstructure heterogeneity and creep damage of DZ125 nickel-based superalloy

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Progress in Natural Science:Materials International 2014年第3期24卷 266-273页

作者： Haofang Sun sugui tian Ning tian Huichen Yu Xianlin Meng School of Materials Science and Engineering Shenyang University of Technology Beijing Institute of Aeronautical Materials

The creep behavior of the DZ125 superalloy at high temperatures has been investigated based on the creep properties measurement and microstructure observations. The experimental results show that, after full heat treatment, the fine and coarser cuboidal γ0precipitates distributed in the dendrite arm and inter-dendrite regions, respectively, the boundaries with various configurations located in the inter-dendrite regions. In the primary creep stage, the cuboidal γ0phase in the alloy transformed into the rafted structure along the direction vertical to the stress *** dislocations slipping and climbing over the rafted γ0phase are attributed the deformation mechanism of the alloy during steady-state ***(1/2)?1 1 0? dislocations slipping in the γ matrix and ?1 1 0? super-dislocations shearing into the γ0phase are the deformation mechanisms of the alloy in the latter stage of creep. And then the alternate slipping of dislocations results in the initiation and propagation of the micro-cracks along the boundaries until the occurrence of the creep fracture. Since the grain boundaries with various angles relative to the stress axis distribute in the different regions, the initiation and propagation of micro-cracks along the boundaries display the various features.& 2014 Chinese Materials Research Society. Production and hosting by Elsevier B.V. All rights reserved.

关键词： DZ125 nickel-based superalloy Microstructure Creep mechanism

Influence of Temperature on Stacking Fault Energy and Creep Mechanism of a Single Crystal Nickel-based Superalloy

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Journal of Materials Science & Technology 2016年第8期32卷 790-798页

作者： sugui tian Xinjie Zhu Jing Wu Huichen Yu Delong Shu Benjiang Qian Shenyang University of Technology Shenyang 110870 China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Science and Technology on Advanced High TemperatureStructural Materials Laboratory Beijing Institute of Aeronautical Materials Beijing 100095 China

The influence of temperatures on the stacking fault energies and deformation mechanism of a Re- containing single crystal nickel-based superalloy during creep at elevated temperatures was investigated by means of calculating the stacking fault energy of alloy, measuring creep properties and performing contrast analysis of dislocation configuration. The results show that the alloy at 760 ℃ possesses lower stacking fault energy, and the stacking fault of alloy increases with increasing temperature. The defor- mation mechanism of alloy during creep at 760 ℃ is 7＇ phase sheared by 〈110〉 super-dislocations, which may be decomposed to form the configuration of Shockley partials plus super-lattice intrinsic stacking fault, while the deformation mechanism of alloy during creep at 1070 ℃ is the screw or edge super- dislocations shearing into the rafted 7＇ phase. But during creep at 7（50 and 980 ℃, some super- dislocations shearing into 7＇ phase may cross-slip from the {111} to {100} planes to form the K-W locks with non-plane core structure, which may restrain the dislocations slipping to enhance the creep resis- tance of alloy at high temperature. The interaction between the Re and other elements may decrease the diffusion rate of atoms to improve the microstructure stability, which is thought to be the main reason why the K-W locks are to be kept in the Re-containing superalloy during creep at 980 ℃.

关键词： Single crystal nickel-based superalloy Stacking fault energy Creep Contrast analysis Deformation mechanism

Creep Behaviors of FGH95 Powder Ni-Base Superalloy

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Chinese Journal of Aeronautics 2009年第4期22卷 444-448页

作者： tian sugui Liu Yang Zhou Xiaoming Zhao Zhonggang Bao Xianyu Wang Wuxiang School of Materials Science and Engineering Shenyang University of Technology Shenyang 110023 China Beijing Institute of Aeronautical Materials Beijing 100095 China

This article makes an investigation into the creep behavior and deformation features of FGH95 powder Ni-base superalloy by means of creep curves and microstructural observation. Results show that this superalloy exposes obvious sensibility to the applied temperature and stresses in the experimental range. Microstructure of the alloy consists of γ＇ phase of various sizes and dispersed carbide particles precipitated in the wider crystal boundaries between the powder particles. During the creep, the deformation of the alloy occurs in the form of singleor double-oriented slipping inside the grains, and some of the finer carbide particles are precipitated near the slipping traces. The wide grain boundaries might be broken into the finer grains due to severe deformation. The deformation mechanism of the alloy during creep is thought to be the activation of dislocations of double-oriented slipping, including （1/2）〈 110〉 dislocation inside the γ matrix phase and 〈110〉 super-dislocation inside the γ＇phase. The formation of the stacking faults and （1/3）〈112〉 super-Shockleys partial dislocation configuration is attributed to the decomposition of 〈 110〉 super-dislocation in the γ＇ phase.

关键词： FGH95 powder Ni-base superalloy microstructure creep deformation features

Creep behavior and effect factors of a TiAl–Nb alloy at high temperature

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Progress in Natural Science:Materials International 2021年第3期31卷 477-485页

作者： Shunke Zhang sugui tian Gengyu Li Ning tian Fangwei Jin Huichen Yu Xiaoxia Lv Guangyan Wang Deyuan Li Shenyang University of Technology Guizhou University of Engineering Science Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Science and Technology on Advanced High Temperature Structural Materials Laboratory AVIC Beijing Institute of Aeronautical Materials

The effect of solution treatment on the microstructure and creep properties of forged TiAl-Nb alloys was *** results showed that the microstructure of forged alloy mainly consisted of γ/αlamellar colonies and fine equiaxed recrystallized γ/α*** the solution treatment the microstructure of the alloy transformed into a fully lamellar structure due to the lamellar colonies growth by consuming equiaxed *** with the forged alloy the creep life of the solution treated alloy at 800℃/220 MPa increased from 116 h to 339 *** better creep resistance may be attributed to the transform of fine equiaxed γ/αgrain to the lamellar colonies with serrated grain boundaries due to the solution *** deformation mechanism of the solution treated alloy during creep is considered to be dislocation slipping within the lamellar γ/αphases,and the dislocation movement may be hindered by the γ/αinterface and the formation of dislocation *** interaction of the dislocations with the tangles may increase the resistance of the dislocation motion and hence improve the creep resistance of the *** was found that during the creep of the forged alloys the cracks mainly initiated at the equiaxed grain,and in the solution treated alloy the cracks initiated at the grain *** creep continued the cracks propagated and connected to each other,leading to the damage and rupture of the forged and solution treated alloys.

关键词： Forged TiAl–Nb alloy Solution treatment Microstructure Creep Deformation and damage

Deformation and damage behaviors of as-cast TiAl-Nb alloy during creep

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Progress in Natural Science:Materials International 2018年第5期28卷 618-625页

作者： Shunke Zhang sugui tian Xiaoxia Lv Huichen Yu Ning tian Zehui Jiao Guoqi Zhao Deyuan Li Guizhou University of Engineering Science Shenyang University of Technology AECC Key Laboratory of Science and Technology on Materials Testing and Evaluation National Key Laboratory of Science and Technology on Advanced High Temperature Structure Materials AECC Beijing Institute of Aeronautical Materials

By means of creep properties measurement and microstructure observation,the deformation and damage behavior of an as-cast TiAl-Nb alloy during creep at temperature near 750°C were *** results showed that the microstructure of the alloy consisted of lamellarγ/α;phase,and the boundaries consisted ofγphase located in between lamellarγ/α;phases with different *** the latter stage of creep,the dislocation networks appeared in the interfaces of lamellarγ/α;phases due to the coarsening of them,which made the coherent interface transforming into the semi-coherent one for reducing its adhesive *** deformation mechanism of the alloy during creep was twinning and dislocations slipping within lamellarγ/α;*** the later period of creep,significant amount of dislocations plied up in the interfaces of lamellarγ/α;phases,which may cause the stress concentration to promote the initiation and propagation of the cracks along the lamellarγ/α;interfaces perpendicular to the stress ***,some cracks on the various cross-sections were connected by tearing edge along the direction of maximum shear stress,up to the creep fracture,which is considered to be the damage and fracture mechanism of alloy during creep at 750°C.

关键词： TiAl-Nb alloy Creep Dislocation network Deformation mechanism Fracture mechanism

Influence of Pre-Compressive Creep on Internal Friction Stress and Creep Parameters of Nickel-Base Single Crystal Superalloys

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稀有金属材料与工程 2009年第A3期38卷 28-32页

作者： Yu Xingfu tian sugui Zhao Zhonggang Du Hongqiang Shang Lijuan Cui Shusen Shenyang University of Technology Shenyang 110023 China Shenyang Liming Aero-engine Corporation AVICI Shenyang 110043 China

By means of pre-compressive creep treatment, the cubic γ′ phase in a nickel base single crystal superalloy is transformed into the P-type rafted structure. And the influence of the pre-compressive creep on the internal friction stress and creep lifetimes of the superalloy are investigated by means of the measurement of the creep curves and microstructure observation. Results show that, compared to the P-type structure alloy, the full heat treated state alloy displays a bigger internal friction stress value of dislocation motion during steady state creep and a longer creep lifetimes. The creep activation energies of the full heat treated and P-type structures alloys are measured to be 462 kJ/mol and 412 kJ/mol, respectively. Thereinto, the P-type rafted γ′ phase in the alloy is transformed into the N-type structure during tensile creep. And the N-type γ′ phase transformed from the P-type structure displays a shorter size in length, this is a main reason of the P-type structure alloy possessing a shorter creep lifetimes due to creep dislocation moving easily over the rafted γ′ phase.

关键词：镍基单晶合金物理性能结构分析

Creep Behaviors of DA Casting and Rolling GH4169 Superalloy

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稀有金属材料与工程 2009年第A3期38卷 20-23页

作者： tian sugui Zhao Zhonggang Liu Yang Bao Xianyu Chen Liqing Liu Xianghua Shenyang University of Technology Shenyang 110023 China State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 China

After the billet of Casting and Rolling GH4169 alloy was directly aged (DA) treated at 720 ℃ and 620 ℃, creep behavior and deformed features of the alloy were investigated by means of the measurement of creep curves and microstructure observation. Results show that the DA Casting and Rolling GH4169 Superalloy displays a lower strain rate during creep and longer lifetimes under the condition of the applied stress of 700 MPa at 650 ℃ , the creep lifetimes of the alloy decrease to 127 h as temperature is elevated to 660 ℃ , and therefore the alloy exhibits an obvious sensitivity of the applied temperatures. During creep, the deformation mechanism of the alloy is thought to be the twinning deformation and slipping of dislocation within the twinning regions. Thereinto, the dislocation slipping of the single and double orientations occur within the twins. As creep enters the tertiary steady state stage, the micro-crack appears on the grains boundaries along the direction vertical to the applied stress axis, and expands along the grain boundary up to fracture.

关键词：合金钢坯蠕变行为锻造技术应力