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Journal of Materials Science & Technology 2022年第1期96卷 248-261页

作者： Seyedmohammad Tabaie Farhad Rézaï-Aria Bertrand C.D.Flipo Mohammad Jahazi Department of Mechanical Engineering École de Technologie Supérieure(ÉTS)H3C 1K3 MontrealQCCanada Institut Clément Ader(ICA) Universitéde ToulouseCNRSIMT Mines AlbiINSAUPSISAECampus Jarlard81013 AlbiFrance TWI Ltd Granta ParkGreat AbingtonCambridge CB216ALUnited Kingdom

The continuous growth in the manufacture of aerospace components such as blisks has led to an increase in the application of different hybrid materials fabricating methods,and thus the requirements for joining and strengthening of dissimilar *** to this goal,selective laser melted(SLM)Inconel718 was joined with forged AD730^(TM)nickel-based superalloy through linear friction welding(LFW)in this *** variation,specifically with respect to secondary phases precipitation was *** microhardness and strengthening mechanisms of the weldment were also *** precipitation(volume fraction and size of particles)at different regions of both sides of the weld line was *** to the weld line,the dissolution ofγ’/γ"and Laves phases and grain refinement occurred which reveals the effects of both compression strain and high temperature on recrystallization and high degree of elemental diffusion in the weld zone(WZ).It is shown that the size,volume fraction,and shape of secondary phases increased and changed(from spherical to long-striped for Laves particles)as we went from the WZ toward the base ***,the measured microhardness indicated that the strength of AD730^(TM)alloy depends significantly on the grain size,while strength in SLM Inconel 718 was dominated by shape(or size)and the presence of secondary phases(γ’/γ"and Laves).

关键词： Additive manufacturing Linear friction welding ni-based superalloy Precipitation Microhardness Strengthening mechanisms

Molecular Dynamics Study of Tension Process of ni-based superalloy

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Acta Metallurgica Sinica(English Letters) 2020年第5期33卷 741-750页

作者： Hui Li Wan Du Yi Liu Materials Genome Institute Shanghai UniversityShanghai 200444China

To understand the atomistic mechanisms of tension failure of ni-based superalloy,in this study,the classical molecular dynamics(MD)simulations were used to study the uniaxial tension processes of both the ni/ni3 Al interface systems and the pure ni and ni3 Al *** examine the effects of interatomic potentials,we adopted embedded atom method(EAM)and reactive force field(ReaxFF)in the MD *** results of EAM simulations showed that the amorphous structures and voids formed near the interface,facilitating further crack propagation within ni *** EAM potentials also predicted that dislocations were generated and annihilated alternatively,leading to the oscillation of yielding stress during the tension *** ReaxFF simulations predicted more amorphous formation and larger tensile *** atomistic understanding of the defect initiation and propagation during tension process may help to develop the strengthening strategy for controlling the defect evolution under loading.

关键词： ni-based superalloy Molecular dynamics Embedded atom method(EAM) Reactive force field(ReaxFF) Uniaxial tension

Role of carbon in modifying solidification and microstructure of a ni?based superalloy with high Al and Ti contents

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Journal of Iron and Steel Research International 2021年第1期28卷 98-110页

作者： Guang‑di Zhao Xi‑min Zang Wen‑ru Sun School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina Institute of Metal Research Chinese Academy of SciencesShenyang 110016LiaoningChina

The effect of carbon ranging from 0.014 to 0.071 wt.%on the solidification and microstructure of a ni-based superalloy with high Al and Ti contents was *** results show that the increase in carbon addition significantly increases the size and volume fraction of MC carbides and promotes the change of their morphology from blocky to elongated ***,the carbon addition obviously decreases the size and volume fraction of eutectic(γ+γ′)and reducesηphase and borides *** change in carbide characteristics is mainly because of the increasing carbide-forming element and carbides precipitation temperature with the increase in carbon which favors the growth of them along the interdendritic liquid *** carbides are formed at an earlier solidification stage than the eutectic(γ+γ′).The increased carbide formation consumes more Ti,which delays and reduces the eutectic(γ+γ′)*** delay of eutectic(γ+γ′)precipitation leads to a deeper undercooling,which significantly decreases the critical Ti concentration for its ***,in turn,lowers Ti/Al ratio in residual liquids ahead of the eutectic(γ+γ′)and hence reducesηformation subsequently.B and Zr are slightly enriched in the carbides,which are considered during discussing how carbon influences the eutectic(γ+γ′)precipitation.

关键词： Carbon ni-based superalloy Solidification Segregation Eutectic(γ+γ′) MC carbide

A novel annealing method to uniformly refine deformed mixed grain microstructure of a solution-treated ni-based superalloy

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Science China(Technological Sciences) 2021年第8期64卷 1741-1751页

作者： WANG GuanQiang CHEN MingSong LIN YongCheng LI HongBin ZENG WeiDong MA YanYong CAI JinLiang PENG ChengXu ZOU FenYang Light Alloy Research Institute Central South UniversityChangsha410083China School of Mechanical and Electrical Engineering Central South UniversityChangsha410083China State Key Laboratory of High Performance Complex Manufacturing Changsha410083China College of metallurgies and energy North China University of Science and TechnologyTangshan063009China

Increasing static recrystallization(SRX)nucleation rate and decreasing grain growth rate are the main ways to obtain uniform and fine grain microstructure by annealing ***,it is contradictory to raise the SRX nucleation rate and reduce grain growth rate during isothermal annealing *** is because the increase of the SRX nucleation rate needs to raise annealing temperature,while the decline of grain growth rate needs to reduce the annealing *** solve the contradiction,a novel method named cooling recrystallization annealing treatment(CRT)is designed and *** the CRT,the relatively high annealing temperature in the primary stage can promote SRX nucleation,and the gradually decreased annealing temperature can reduce the growth rate of SRX ***,an aged treatment is first carried out to precipitate high content of theδphase before the ***δphases not only provide large numbers of sites for SRX nucleation but also limit the grain growth due to the pinning effect,especially in the primary high-temperature *** results show that the novel method can refine deformed mixed grain microstructure well when the suitable cooling rate,start and final recrystallization annealing temperatures are *** deformed mixed grain can be uniformly refined to an average size of 8.26μm with the route of 900℃×12 h+1020℃→970℃×20 min.

关键词： ni-based superalloy annealing method refinement mechanism grain uniformity microstructure evolution

Correlation Between Phase Stability and Tensile Properties of the ni-based superalloy MAR-M247

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Acta Metallurgica Sinica(English Letters) 2021年第6期34卷 872-884页

作者： Linxu Li Xiufang Gong Changshuai Wang Yunsheng Wu Hongyao Yu Haijun Su Lanzhang Zhou State Key Laboratory of Long-Life High Temperature Materials Dong Fang Turbine Co.LtdDeyang 618000China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China Beijing Key Laboratory of Advanced High Temperature Materials Beijing 100081China Beijing CISRI-GAONA Materials and Technology CO. LTDBeijing 100081China

Phase stability and its effect on tensile properties of MAR-M247 alloy have been investigated during thermal exposure at 800–900°C for up to 10,000 *** investigations reveal that the larger secondaryγ′phase has no obvious growth,but the smaller tertiaryγ′phase obviously coarsens and the coalescence occurs during thermal exposure at 850°C and below.γ′coarsening behavior is consistent with the description of Ostwald ripening theory beforeγ′***-rich blocky MC carbide shows excellent thermal stability,but Ta-rich script-type MC carbide gradually degenerates via reaction,MC+γ→M_(23)C_(6)+γ′and finally formsγ film around MC and M_(23)C_(6) *** increasing thermal exposure time,the tensile strength *** ductility first increases and then decreases during exposure at 800°C,but it decreases continuously at 900°*** addition,the ductility keeps almost constant when the exposure time is longer than 5000 h.

关键词： ni-based superalloy Phase stability Tensile properties Fractural behavior

Methods and mechanisms for uniformly refining deformed mixed and coarse grains inside a solution-treated ni-based superalloy by two-stage heat treatment

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Journal of Materials Science & Technology 2021年第18期77卷 47-57页

作者： Guan-Qiang Wang Ming-Song Chen Hong-Bin Li Y.C.Lin Wei-Dong Zeng Yan-Yong Ma School of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China Light Alloy Research Institute Central South UniversityChangsha 410083China State Key Laboratory of High Performance Complex Manufacturing Changsha 410083China College of Metallurgies and Energy North China University Science and TechnologyTangshan 063009China

The uniform refinement mechanisms and methods of deformed mixed and coarse grains inside a solution-treatment ni-based superalloy during two-stage annealing treatment have been *** two-stage heat treatment experiments include an aging annealing treatment(AT)and a subsequent recrystallization annealing treatment(RT).The object of AT is to precipitate someδphases and consume part of storage energy to inhibit the grain growth during RT,while the RT is to refine mixed and coarse grains by *** can be found that the recrystallization grains will quickly grow up to a large size when the AT time is too low or the RT temperature is too high,while the deformed coarse grains cannot be eliminated when the AT time is too long or the RT temperature is too *** addition,the mixed microstructure composed of some abnormal coarse recrystallization grains(ACRGs)and a large number of fine grains can be observed in the annealed specimen when the AT time is 3 h and RT temperature is 980℃.The phenomenon attributes to the uneven distribution ofδphase resulted from the heterogeneous deformation energy when the AT time is too *** the regions with a large number ofδphases,the recrystallization nucleation rate is promoted and the growth of grains is limited,which results in fine ***,in the regions with fewδphases,the recrystallization grains around grain boundaries can easily grow up,and the new recrystallization nucleus is difficult to form inside grain,which leads to ***,in order to obtain uniform and fine annealed microstructure,it is a prerequisite to precipitate even-distributedδphase by choosing a suitable AT time,such as 12 ***,a relative high RT temperature is also needed to promote the recrystallization nucleation aroundδ*** optimal annealing parameters range for uniformly refining mixed crystal can be summarized as:900℃×12 h+990℃×(40-60 min)and 900℃×12 h+1000℃×(10-15 min).

关键词： ni-based superalloy Aging annealing Recrystallization annealing Grain refinement Microstructural evolution Mixed grain microstructure

Influence of Selective Laser Melting Process Parameters on Microstructure and Properties of a Typical ni-based superalloy

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Acta Metallurgica Sinica(English Letters) 2022年第10期35卷 1673-1687页

作者： Zhen Lu Chengcai Zhang Nana Deng Haiping Zhou Ruirui Fang Kuidong Gao Yukuo Su Hongbin Zhang School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao266590China Jier Machine-Tool Group Co.Ltd Jinan250022China

The influence of selective laser melting(SLM)process parameters on the microstructure and mechanical properties of a typical ni-based superalloy was *** optimum parameters of P=170 W,V=0.8 m/s were determined,under which the SLMed samples exhibited both the largest relative density of 99.57%and the best mechanical properties,including the microhardness(329.3±3.8 HV),yield strength(726±8.1 MPa),ultimate tensile strength(900±5.9 MPa)and elongation((31.9±0.24)%).The average grain size ranges of SLMed samples are from 15.2 to 17.4μm,with a typical mixed grain *** to the high cooling rate and remelting during SLM process,a large number of low-angle grain boundaries(LAGBs),dislocations and sub-grains were formed,and the fraction of LAGBs reached above 65%.At the same time,the content of low-Σcoincidence site lattice(CSL)boundaries was mostly less than 1%,while there was almost noγ′phase precipitated in the *** texture of SLMed samples was weak,and there was no obvious preferred growth *** with the microstructure characterization,both grain refinement strengthening and dislocation strengthening were considered as the main strengthening ***,the fracture mechanism of the optimum sample belonged to ductile fracture.

关键词： Selective laser melting ni-based superalloy Relative density Microstructure Mechanical property

Microstructures and mechanical properties of Ti3Al/ni-based superalloy joints brazed with Auni filler metal

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Journal of Materials Science & Technology 2019年第9期35卷 2070-2078页

作者： H.S. Ren H.P.Xiong W.M. Long B. Chen Y.X. Shen J. Pang Welding and Plastic Forming Division Beijing Institutes of Aeronautical MatericalBeijing 100095China State Key Laboratory of Advanced Brazing Filler Metals and Technology Zhengzhou Research Institute of Mechanical EngineeringZhengzhou 450001 China Department of Material Science and Engineering Beihang UniversityBeijing 100191China

For the purpose of high-temperature service and the weight reduction in aviation engineering applications, the dissimilar joining of Ti3Al-based alloy to ni-based superalloy (GH536) was conducted using Au-17.5ni (wt%) brazing filler metal. The microstructure and chemical composition at the interfaces were investigated by scanning electron microscope, X-ray diffraction and transmission electron microscope. The diffusion behaviors of elements were analyzed as well. The results indicated that the Ti3Al/GH536 joint microstructure was characterized by multiple layer structures. Element ni from Au-ni filler metal reacted with Ti3Al base metal, leading to the formation of Alni2Ti and niTi compounds. Element ni from Ti3Al base metal reacted with ni and thus ni3Nb phase was detected in the joint central area. Due to the dissolution of ni-based superalloy,(ni,Au) solid solution ((ni,Au)ss) and ni-rich phase were visible adjacent to the superalloy side. The average tensile strength of all the joints brazed at 1253 K for 5-20 min was above 356 MPa at room-temperature. In particular, the joints brazed at 1253 K/15 min presented the maximum tensile strength of434 MPa at room-temperature, and the strength of 314 MPa was maintained at 923 K. Alni2Ti compound resulted in the highest hardness area and the fracture of the samples subjected to the tensile test mainly occurred in this zone.

关键词： Ti3Al-based alloy ni-based superalloy Brazing Microstructure Tensile strength

Microstructure and mechanical properties of TiAl/ni-based superalloy joints vacuum brazed with Ti-Zr-Fe-Cu-ni-Co-Mo filler metal

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Rare Metals 2021年第8期40卷 2134-2142页

作者： Bao Wan Xiao-Qiang Li Cun-Liang Pan Dong-Yu Li Sheng-Guan Qu Chao Yang National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials South China University of TechnologyGuangzhou510640China

For the purpose of elevated temperature service and weight reduction in aerospace vehicle applications,a novel Ti-Zr-Fe-Cu-ni-Co-Mo filler metal was employed to join TiAl to ni-based superalloy(GH536).The effects of brazing temperature on interfacial microstructure and chemical composition of the joints were *** representative joint microstructure from TiAl substrate to GH536 substrate was primarily composed of four characteristic layers in order:B_(2);Al_(3)niTi_(2);Alni_(2)Ti containing Cr-rich(Cr,ni,Fe)_(ss)(subscript ss represents solid solution),ni-rich(ni,Cr,Fe)_(ss) and Tini3;Cr-rich(Cr,ni,Fe)_(ss)containing Alni_(2)Ti,ni-rich(ni,Cr,Fe)_(ss) and *** IV has the majority of the brazing seam,while LayerⅡwas the *** the thickness of LayerⅡwas not affected by brazing *** the increase in brazing temperature in the range of 1110-1170℃,both the shear strength and the thickness of brazing seam firstly increased and then *** joint performance was jointly controlled by the thickness of brazing seam,the amounts of microcracks and intermetallic compounds formed in brazing *** maximum shear strength of 183 MPa at room temperature was obtained together with a peak thickness when the joint was brazed at 1150℃for 10 min and the shear fracture mainly occurred in the thinnest LayerⅡAl_(3)niTi_(2).

关键词： TiAl alloy ni-based superalloy Brazing Microstructure Shear strength