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Effect of solution cooling rate on the microstructure and creep deformation mechanism of a rhenium-free second-generation single crystal superalloy

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Journal of Materials Science & Technology 2022年第36期131卷 14-29页

作者： Xipeng Tao Yunling Du Xinguang Wang Jie Meng Yizhou Zhou Jinguo Li Xiaofeng Sun Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

Various cooling scenarios(water,oil,air and furnace)were employed to study the impacts of the solution cooling rate(SCR)on the microstructure and creep behavior of a novel single-crystal(SX)*** results showed that the cubic degree and size of theγphases were inversely proportional to the *** creep life first increased and then dropped dramatically with a reduction in the *** creep life of the sample cooled with air cooling(AC)was the highest,up to 144.90 h at 800℃/750 MPa and160.15 h at 1100℃/137 *** creep at 800℃/750 MPa,the improved creep life of the AC sample was mainly attributed to the fine cubicγphases,which decreased the rate ofγ-phase coarsening and favoured plastic deformation by promoting the active movement of *** AC helped theγphases become rich in Al,Ti and Ta while depleted in Co and Cr,which enhanced its stacking fault energy,thus promoting the formation of dislocation ***,the largest negative lattice misfit caused by AC induced denserγ/γinterface dislocation networks at 1100℃/137 MPa,which efficiently reduced the minimum creep *** calculated average dislocation spacing results indicated that the smallest density of excess dislocations corresponded to the AC sample,proving its greatest creep ***,the size of the secondaryγphases first decreased and then increased sharply with decreasing SCR during creep at 1100℃/137 MPa,when fine secondaryγphases had a positive role in the blockage of dislocation movement in the ***,the comprehensive SCR effect was explored to provide more guidance in the design of Re-free SX superalloys.

关键词： Solution cooling rate Microstructure Creep property Deformation mechanism single crystal superalloy

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Precipitation Behaviors in the Diffusion Affected Zone of TLP Bonded single crystal superalloy Joint

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Journal of Materials Science & Technology 2015年第2期31卷 129-134页

作者： Naicheng Sheng Jide Liu Tao Jin Xiaofeng Sun Zhuangqi Hu superalloys Division Institute of Metal ResearchChinese Academy of Sciences

The single crystal superalloys were joined by transient liquid phase(TLP) bonding. The precipitating behavior in the diffusion affected zone(DAZ) was studied and the hardness across the DAZ was analyzed. Results have shown that there existed M3B2,M5B3 and M23B6 borides in the DAZ. With increasing bonding time,fine M3B2 precipitates formed first near the isothermal solidification zone(ISZ)/matrix interface. Then,the dendritic M5B3 precipitates formed with an obvious orientation relationship with the substrate. The acicular precipitates were constituted by M23B6 and M5B3 phases with continuous or discontinuous morphologies. The hardness of the DAZ reached a summit in the fine M3B2 region and decreased with the increase of the distance away from the ISZ/matrix interface.

关键词： single crystal superalloy Transient liquid phase b

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Effect of cellular recrystallization on tensile properties of a nickel-based single crystal superalloy containing Re and Ru

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Journal of Iron and Steel Research International 2017年第10期24卷 1059-1064页

作者： Zhen-xue Shi Shi-zhong Liu Xiao-dai Yue Li-jie Hu Wan-peng Yang Xiao-guang Wang Jia-rong Li Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical MaterialsBeijing 100095China

A nickel-based single crystal superalloy containing Re and Ru was cast in a directional solidification *** single crystal specimens after standard heat treatment were grit blasted with different pressures and then heat treated at 1100°C for 4 hunder vacuum *** evolution of recrystallized microstructure and its effect on the tensile properties at 850 and 980°C were *** heat treatment,the cellular microstructure was observed,and the thickness of the cellular recrystallization zone increases with the increase in grit blasting *** appearance of the cellular structure undermines the tensile *** the tensile strength and elongation decrease with increasing the thickness of the cellular *** recrystallized grain boundaries can act as the channels for the crack initiation and propagation during tensile *** low bearing capacity of recrystallized layers and the local stress concentration resulting from the notch effect of cracking were the main reasons for the decrease of tensile properties.

关键词： single crystal superalloy Cellular recrystallization Tensile property Microstructure Fracture morphology

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Effects of scanning speed on microstructure in laser surface-melted single crystal superalloy and theoretical analysis

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Journal of Materials Science & Technology 2018年第8期34卷 1315-1324页

作者： Guowei Wang Jingjing Liang Yanhong Yang Yu Shi Yizhou Zhou Tao Jin Xiaofeng Sun Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology

Scanning speed is a critical parameter for laser process, which can play a key role in the microstruc- ture evolution of laser melting. In the laser melting of single crystal superalloy, the effects of scanning speed were investigated by experimental analysis and computational simulation. The laser was scanning along [710] direction on （001） surface in different speeds. Solidification microstructures of dendrites growth direction and the primary dendritic spacing were analyzed by metallograph. Besides, a planar interface during solidification was taken into attention, Experiment results indicated that the primary dendritic spacing and thickness of planar interface decrease with the increase of speed. Through simu- lation, distribution of dendrites growth velocity and thermal gradient along dendrite growth direction were calculated, and the simulation of dendrites growth direction agreed with the experiment results. Additionally, a constant value was acquired which can be used to predict the primary dendritic spacing. Moreover, according to curve-fitting method and inequality relation, a model was proposed to predict the thickness of planar interface.

关键词： Scanning speed Laser remelting single crystal superalloy First dendrites spacing Planar interface

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Effect of Nb content on microstructure stability and stress rupture properties of single crystal superalloy containing Re and Ru

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Journal of Central South University 2016年第6期23卷 1293-1300页

作者：史振学刘世忠岳晓岱王效光李嘉荣 Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials

Three experimental single crystal superalloys with 0%Nb,0.5%Nb,1.0%Nb were cast in the directionally solidified furnace,while other alloying element contents were basically kept *** effect of Nb on the microstructure,stability at1100°C and stress rupture properties at 1070°C and 160 MPa of the single crystal superalloy were *** experiment results show that the primary dendrite arm spacing decreases and the volume fraction ofγ/γ′eutectic of the alloy increases with the increase of Nb content in the as-cast *** size ofγ′phase particles becomes small and uniform and the cubic shape does not obviously change with the increase of Nb *** precipitating rate and volume fraction of TCP phases increase significantly with the increase of Nb content in the process of long term aging at 1100°*** stress rupture lives increase and elongation decreases with increasing Nb content at 1070°C/160 *** last,the relationship between the microstructures stability,stress rupture properties of the alloy and Nb content is discussed based on JMat Pro software and the lastest relevant database for single crystal superalloy.

关键词： single crystal superalloy Nb microstructure stability long-term aging stress rupture properties

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Forming and growing mechanisms of homogenization-solution pores in a single crystal superalloy

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Rare Metals 2018年第5期37卷 399-406页

作者： Xiao-Dai Yue Jia-Rong Li Xiao-Guang Wang Zhen-Xue Shi Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials

The forming and growing mechanisms of homogenization-solution pores in a single crystal superalloy were investigated. The microstructures were observed with optical microscope （OM） and field emission microscope （FEM） after homogenization-solution heat treated at 1328℃ and 1350 ℃ for 2 h, 6 h and 9 h. Results indicate that when heat treated at 1328 ℃, pores appear at the interface of eutectic and matrix at first and then leave in the matrix with the shrink of eutectic. When heat treated at 1350 ℃, incipient melting happens at first, and some of them have a pore in the center. After that, with the homogenization-solution process, incipient melting microstructure fades away gradually. By analyzing the results with thermodynamics and kinetics methods, it is concluded that some pores nucleate during directional solidification and then become larger and visible during homogenization-solution heat treatments; some pores are generated by incipient melting, yet such pores are difficult to be distinguished from other pores; imbalanced elements cross-diffusion induces to the forming and growing of pores too, and such imbalanced diffusion also plays an important part on the growth of all preexisting pores.

关键词： single crystal superalloy Pore Homogenization Solution Heat treatment Incipient melting

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Effects of longitudinal magnetic field on primary dendrite spacing and segregation of directionally solidified single crystal superalloy

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Progress in Natural Science:Materials International 2024年第1期34卷 26-36页

作者： Congjiang Zhang Yilin Zhou Chen Shen Weili Ren Xiaotan Yuan Biao Ding Haibiao Lu Zuosheng Lei Yunbo Zhong Ang Zhang State Key Laboratory of Advanced Special Steel College of Materials Science and Engineering Shanghai University National Engineering Research Center for Magnesium Alloys Natural Key Laboratory of Advanced Casting Technologies College of Materials Science and EngineeringChongqing University

The primary dendrite spacing(PDS) and segregation of directionally solidified single crystal(SC) superalloy under the longitudinal magnetic field(LMF) were investigated based on the analysis of the whole cross-sectional microstructure at different solidification distances. The results show that the PDS under the LMF remains basically unchanged at different solidification distances, and it is greater than that under no LMF. With the increase of magnetic field intensity, the PDS increases and the macrosegregation decreases. The increasing PDS and reducing segregation under the LMF can be attributed to the increase of solute boundary layer, which expands the non-equilibrium freezing temperature range and brings the effective partition coefficient closer to 1. The increase of the solute enrichment layer thickness could be caused by the downward secondary circulation generated by the thermoelectric magnetic convection(TEMC) near the interface, which drives the migration of solutes towards the interdendritic region. This work not only clarifies the mechanism of LMF controlling PDS and reducing segregation by TEMC, but also provides theoretical guidance for producing high-quality SC superalloys using magnetic fields.

关键词： Primary dendrite spacing Segregation single crystal superalloy Directional solidification Magnetic field Thermoelectric magnetic convection

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Improvement for creep strength of a second-generation single crystal superalloy by design of heat treatments

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Rare Metals 2024年第1期43卷 342-350页

作者： Wan-Shun Xia Xin-Bao Zhao Jia-Chen Xu Quan-Zhao Yue Qing-Qing Ding Huan-Chang Duan Yue-Feng Gu Hong-Bin Bei Ze Zhang Institute of superalloys Science and Technology School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China State Key Laboratory of Silicon and Advanced Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

Design of heat treatments is related to the key technology for development of nickel-based single crystal superalloys(Ni-SXs). Based on the full understanding of the solidification characteristics, this work applies optimization design of heat treatments for a second-generation Ni-SX. Microstructure evolution and creep properties are compared in the material under conventional/standard(Std.) and optimized(Opt.) treatments. For the Std. sample,strong dendritic segregations determine inconsistent microstructure evolution in the dendritic(D) and interdendritic region(ID), while the latter serves as weak area to have the prior microcrack initiation, damaging overall performance of the alloy. The Opt. treatment applies higher homogenization temperature, leading to overall reduced segregations, while not inducing incipient melting. A lower temperature of first-step ageing is used to lower the size ofγ'particles. These help to form the more uniform microstructure in dendritic and interdendritic region and relieve the inconsistent microstructure evolution. The balanced local strength makes ID no longer as the weak area,thus restricting microcrack initiation. Great improvement of high temperature and low stress property is obtained by this progress, leading to the pronounced increase of creep rupture life under 1100 °C/140 MPa.

关键词： single crystal superalloy Heat treatment Segregation Solidification Creep property

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Crack growth behavior of SRR99 single crystal superalloy under thermal fatigue

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Rare Metals 2008年第5期27卷 526-530页

作者： LIU Yuan YU Jinjiang XU Yan SUN Xiaofeng GUAN Hengrong HU Zhuangqi Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Graduate School of Chinese Academy of Sciences Beijing 100039 China

The thermal fatigue behavior of a single crystal superalloy SRR99 was investigated. Specimens with V-type notch were tested at the peak temperatures of 900, 1000, and 1100℃. The crack growth curves as a function of the number of cycles were plotted. With the increase of peak temperature, the crack initiation life was shortened dramatically. Through optical microscopy （OM） and scanning electron microscopy （SEM） observation, it was found that multiple small cracks nucleated at the notch tip region but only one or two of them continued to develop in the following thermal cycles. The primary cracks generally propagated along a preferential direction. Microstructure changes after thermal fatigue were also discussed on the basis of SEM observation.

关键词： single crystal superalloy thermal fatigue crack growth behavior dendrite orientation

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Effect of Solidification Condition on Microstructure and Mechanical Properties of single crystal superalloy

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Journal of Materials Science & Technology 2001年第1期17卷 89-90页

作者： Wanming ZHANG Wei DU and Hengzhi FU State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China Northwestern Polytech Univ State Key Lab Solidificat Proc Xian 710072 Peoples R China

CMSX-2 single crystals with different primary dendrite arm spacing were obtained on directional solidification apparatus with high temperature gradient (250 K/cm). The microstructure and elevated temperature stress r... 详细信息

关键词： single crystal superalloy single crystals directional solidification temperature gradient elevated temperature dendrite arm spacing stress rupture

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