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EBSD analysis of grain boundary evolution and dynamic recrystallization of Inconel 625 superalloy at various hot spinning feed rates

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Progress in Natural Science:materials International 2024年第1期34卷 56-65页

作者： Zhanjie Jing Jiangkun Fan Xudong Liu Yuelin Song Zixiao Wang Kai Cao Yuetan Chen Heng Fu Jianing Zhang Jinshan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical University Chongqing Innovation center Northwestern Polytechnical University national&local joint engineering research center for precision thermoforming technology of advanced metal materials

Hot spinning can make the material withstand shear stress, so that the shape of the material has a great change,which is one of the main processing methods of nickel-based alloy plate members. Inconel 625 alloy, which has excellent high temperature mechanical properties and can be used as the main candidate material for aerospace applications, needs further study on its hot spinning deformation behavior and deformation mechanism. In this paper, the effect of feed rate on the microstructure evolution of Inconel 625 superalloy was studied by the electron backscattered diffraction technology. The microstructure with necklace-like structures composed of dynamic recrystallization(DRX) grains was observed after hot spinning. It was found that at the low feed rate, the promotion of DRX degree and grain refinement happened, where the grain size reached the trough of 10.99 μm under a feed rate of 300 mm/min. However, with the further feed rate rising, the degree of DRX was suppressed to a certain extent and grain size increased to 14.26 μm. On balance, the feed rate of 300 mm/min was the most efficient condition for grain refinement. Besides, it was revealed that both discontinuous dynamic recrystallization(DDRX) and continuous dynamic recrystallization(CDRX) occurred during hot spinning. DDRX includes the initial grain boundary nucleation by bulging and the annealing twin boundary assisted nucleation, while the CDRX mechanism is related to the continuous subgrain rotation within the deformed grain. DDRX is the main DRX mechanism.

关键词： Inconel 625 superalloy Hot spinning Grain boundary evolution DRX mechanism

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Photoelectrochemical seawater oxidation with metal oxide materials:Challenges and opportunities

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Journal of Energy Chemistry 2024年第10期97卷 767-782,I0016页

作者： Miao Kan Hangyu Hu Weijie Zhuang Meng Tao Shiqun Wu Jinlong Zhang Key Laboratory for advanced materials and joint International research Laboratory of precision Chemistry and Molecular engineering Feringa Nobel Prize Scientist Joint Research CenterSchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Shanghai engineering research center for Multimedia Environmental Catalysis and Resource Utilization East China University of Science and TechnologyShanghai 200237 China

Photocatalytic water oxidation is a crucial counter-electrode reaction in the process of photoelectrochemical energy *** its importance,challenges remain in effectively and sustainably converting water to oxygen,particularly with readily available and inexpensive electrolyte solutions such as *** metal oxide materials have demonstrated their advantages in promoting efficiency by reducing overpotential and improving light utilization,stability remains limited by corrosion in multicomponent *** this paper,we reviewed the relationship between four basic concepts including photoelectrochemistry,metal oxide,water oxidation and seawater to better understand the challenges and opportunities in photoelectrochemical(PEC)seawater *** overcome these challenges,the advances in material design,interfacial modification,local environment control and reactor design have been further reviewed to benefit the industrial PEC seawater ***,we demonstrate engineered layered metal oxide electrodes and cell structures that enable powerful and stable seawater *** also outline and advise on the future direction in this area.

关键词： Photoelectrochemistry Anode Water oxidation metal oxide Seawater Stability

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Force Compensation Control for Electro-Hydraulic Servo System with Pump-Valve Compound Drive via QFT-DTOC

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Chinese Journal of Mechanical engineering 2024年第2期37卷 228-246页

作者： Kaixian Ba Yuan Wang Xiaolong He Chunyu Wang Bin Yu Yaliang Liu Xiangdong Kong Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Qinhuangdao 066004China School of Mechanical engineering Yanshan UniversityQinhuangdao 066004China national engineering research center for local joint of advanced Manufacturing technology and Equipment Yanshan UniversityQinhuangdao 066004China

Each joint of a hydraulic-driven legged robot adopts a highly integrated hydraulic drive unit(HDU),which features a high power-weight ***,most HDUs are throttling-valve-controlled cylinder systems,which exhibit high energy *** contrast,pump control systems offer a high ***,their response ability is *** fully utilize the advantages of pump and valve control systems,in this study,a new type of pump-valve compound drive system(PCDS)is designed,which can not only effectively reduce the energy loss,but can also ensure the response speed and response accuracy of the HDUs in robot joints to satisfy the performance requirements of ***,considering the force control requirements of energy conservation,high precision,and fast response of the robot joint HDU,a nonlinear mathematical model of the PCDS force control system is first *** addition,pressure-flow nonlinearity,friction nonlinearity,load complexity and variability,and other factors affecting the system are considered,and a novel force control method based on quantitative feedback theory(QFT)and a disturbance torque observer(DTO)is designed,which is denoted as QFT-DTOC *** method improves the control accuracy and robustness of the force control system,reduces the effect of the disturbance torque on the control performance of the servo motor,and improves the overall force control performance of the ***,experimental verification is performed using the PCDS performance test *** experimental results and quantitative data show that the QFT-DTOC proposed herein can significantly improve the force control performance of the *** relevant force control method can be used as a bottom-control method for the hydraulic servo system to provide a foundation for implementing the top-level trajectory planning of the robot.

关键词： Legged robot Pump-valve compound drive system(PCDS) Force compensation control Quantitative feedback theory(QFT) Disturbance torque observer(DTO)

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Pulsed current-assisted twelve-roll precision rolling deformation of SUS304 ultra-thin strips with exceptional mechanical properties

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International Journal of Extreme Manufacturing 2024年第4期6卷 291-305页

作者： Wanwan Fan Tao Wang Jinxiong Hou Zhongkai Ren Qingxue Huang Guanghui Wu College of Mechanical and Vehicle engineering Taiyuan University of TechnologyYingze West Street 79Taiyuan 030024Shanxi ProvincePeople's Republic of China engineering research center of advanced metal Composites Forming technology and Equipment of Ministry of Education Taiyuan University of TechnologyYingze West Street 79Taiyuan 030024Shanxi ProvincePeople's Republic of China national Key Laboratory of metal Forming technology and Heavy Equipment Taiyuan University of TechnologyYingze West Street 79Taiyuan 030024Shanxi ProvincePeople's Republic of China College of Aeronautics and Astronautics Taiyuan University of TechnologyYingze West Street 79Taiyuan 030024Shanxi ProvincePeople's Republic of China

Innovative pulsed current-assisted multi-pass rolling tests were conducted on a 12-roll mill during the rolling deformation processing of SUS304 ultra-thin *** results show that in the first rolling pass,the rolling reduction rate of a conventionally rolled sample(at room temperature)is 33.8%,which can be increased to 41.5%by pulsed current-assisted rolling,enabling the formation of an ultra-thin strip with a size of 67.3μm in only one rolling *** three passes of pulsed current-assisted rolling,the thickness of the ultra-thin strip can be further reduced to 51.7μ*** clearly compare the effects of a pulsed current on the microstructure and mechanical response of the ultra-thin strip,ultra-thin strips with nearly the same thickness reduction were *** was found that pulsed current can reduce the degree of work-hardening of the rolled samples by promoting dislocation detachment,reducing the density of stacking faults,inhibiting martensitic phase transformation,and shortening the total length of grain *** a result,the ductility of ultra-thin strips can be effectively restored to approximately 16.3%while maintaining a high tensile strength of 1118 ***,pulsed current-assisted rolling deformation shows great potential for the formation of ultra-thin strips with a combination of high strength and ductility.

关键词： pulsedcurrent-assisted SUS304 ultra-thinstrip rolling reductionrate work-hardening mechanical properties

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Customized heat treatment process enabled excellent mechanical properties in wire arc additively manufactured Mg-RE-Zn-Zr alloys

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International Journal of Extreme Manufacturing 2024年第4期6卷 276-289页

作者： Dong Ma Chunjie Xu Shang Sui Yuanshen Qi Can Guo Zhongming Zhang Jun Tian Fanhong Zeng Sergei Remennik Dan Shechtman School of materials Science and engineering Xi'an University of TechnologyXi'anShaanxi 710048People's Republic of China Xi'an Shechtman Nobel Prize New materials Institute Xi'an 710048People's Republic of China Xi'an Key Laboratory of advanced Magnesium Alloy Additive Manufacturing and precision Forming Xi'anShaanxi 710048People's Republic of China Department of materials Science and engineering and Guangdong Provincial Key Laboratory of materials and Technologies for Energy Conversion Guangdong Technion—Israel Institute of TechnologyShantou 515063People's Republic of China MGM Nobel Prize New materials Co. LtdTongchuan 727100People's Republic of China Department of materials Science and engineering Technion-Israel Institute of TechnologyHaifa 32000Israel center for Nanoscience&Nanotechnology Hebrew University of JerusalemEdmond J.Safra CampusJerusalem 91904Israel

Customized heat treatment is essential for enhancing the mechanical properties of additively manufactured metallic materials,especially for alloys with complex phase constituents and heterogenous ***,the interrelated evolutions of different microstructure features make it difficult to establish optimal heat treatment ***,we proposed a method for customized heat treatment process exploration and establishment to overcome this challenge for such kind of alloys,and a wire arc additively manufactured(WAAM)Mg-Gd-Y-Zn-Zr alloy with layered heterostructure was used for feasibility *** this method,the optimal microstructures(fine grain,controllable amount of long period stacking ordered(LPSO)structure and nano-scaleβ'precipitates)and the corresponding customized heat treatment processes(520°C/30 min+200°C/48 h)were obtained to achieve a good combination of a high strength of 364 MPa and a considerable elongation of 6.2%,which surpassed those of other state-of-the-art WAAM-processed Mg ***,we evidenced that the favorable effect of the undeformed LPSO structures on the mechanical properties was emphasized only when the nano-scaleβ'precipitates were *** is believed that the findings promote the application of magnesium alloy workpieces and help to establish customized heat treatment processes for additively manufactured materials.

关键词： wire arc additive manufacturing heat treatment Mg-RE-Zn-Zr alloys LPSO structure mechanical properties

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Dependence of mechanical properties on the microstructure characteristics of a near β titanium alloy Ti-7333

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Journal of materials Science & technology 2019年第1期35卷 48-54页

作者： Ruifeng Dong Jinshan Li Hongchao Kou Jiangkun Fan Bin Tang State Key Laboratory of Solidification Processing Northwestern Polytechnical University national & local joint engineering research center for precision thermoforming technology of advanced metal Matfigerials

In this work, the microstructure and the corresponding tensile properties of the rolled Ti-7Mo-3Nb-3Cr-3Al(Ti-7333) alloy before and after the thermal treatments were investigated. The results show that a strong α-fiber texture is developed in the rolled Ti-7333 alloy. The deformed matrix and the texture significantly induce the variant selection of β phase. The high strength of the rolled Ti-7333 alloy is attributed to the texture parallel to the tensile direction and the dispersed α phase within the matrix. After the solution treatment followed by the aging treatment, the texture decreases and the microstructure consists of the equiaxed β grains, the spheroidal α_p phase and various needle-like α variants. Eventually, the alloy could achieve an optimal combination with the strength of about 1450 MPa,the ductility of about 10.5% and a considerable shear strength of about 775 MPa. This balance can be ascribed to the performance of the spheroidal α_p phase and various needle-like α_s variants. The results indicate that the Ti-7333 alloy could be a promising candidate material for the high-strength fastener.

关键词： Near β titanium alloy Hot-rolled Ti-7333 Texture Thermal treatment α phase Mechanical properties

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Microstructure/texture evolution maps to optimize hot deformation process of near-α titanium alloy

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Progress in Natural Science:materials International 2020年第1期30卷 86-93页

作者： Zhixin Zhang Jiangkun Fan Bin Tang Hongchao Kou Jian Wang Zhiyong Chen Jinshan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical University Baoti Group Ltd. national & local joint engineering research center for precision thermoforming technology of advanced metal materials Institute of metal research Chinese Academy of Sciences

The microstructure/texture evolution(MTE,for short) map and processing map of a new near a titanium alloy Ti65 were constructed in order to investigate the workability and microstructure evolution of hot *** processing map illustrated four domains,two summit domains and two instability *** morphologies of the a phase changed from the spheroidization(α+β region) to the deformed and elongated β grains(near the βtransus temperature Tβ),and then to the obvious dynamic recrystallization(DRX)(β region) with the temperature rising from 930 ℃ to 1140℃.Deformation in the α+β field mainly generated the texture component with [0001]or [0223] parallel to radial directions(RDs).While deformation in the β phase field formed two types of texture component with [0001] parallel to RDs and [2110] parallel to compression *** optimized processing map was summarized by overlaying the macro-instability map on the original processing map,and the instability domain of Ti65 alloy was confirmed in the area with the strain rate higher than 0.01 s-1.

关键词： Titanium alloy Hot deformation Deformation mechanism Microstructure evolution Texture

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Platelet-based bioactive systems guided precision targeting and immune regulation for cancer therapy

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Nano research 2024年第9期17卷 8269-8284页

作者： Xinyi Cai Long Qiu Zhenying Diao Lintao Cai Ting Yin Hong Pan Guangdong Key Laboratory of Nanomedicine CAS-HK Joint Lab of BiomaterialsCAS Key Laboratory of Biomedical Imaging Science and SystemInstitute of Biomedicine and BiotechnologyShenzhen Institute of Advanced Technology(SIAT)Chinese Academy of SciencesShenzhen 518055China School of pharmacy Guangdong Medical UniversityDongguan 523808China Sino-Euro center of Biomedicine and Health Shenzhen 518024China

The antitumor effects of conventional drug carriers are often attenuated and limited in application by biological barriers associated with tumor heterogeneity and resistance brought about by low tumor *** the rapid development of nanotechnology,naturally derived bioactive materials,and live cell carriers,a promising strategy emerges for targeting the tumor microenvironment(TME)for precision cancer *** unique injury-targeting properties of platelets can significantly extend functional activity,which cannot be achieved with conventional *** this review,three strategies based on platelet-engineered materials are systematically described,namely nanoparticles for platelet membrane camouflage,engineered activated platelets,and targeted-platelets ***-based nanomaterials can effectively coordinate local and distant tumor-host crosstalk with controlled active tumor site recognition and killing effects due to the presence of specific membrane proteins on the surface and the self-secretion of a large number of *** advances in platelets for effectively overcoming biological barriers and reducing immune resistance in cancer immunotherapy applications will be discussed in future clinical *** review provides an overview of recent research advances in platelet-based bioactive material-directed immunotherapy and chemotherapy to inform future antitumor combination therapies.

关键词： platelets bionic targeting immune modulation precision therapy deep penetration

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Microstructural evolution and FCC twinning behavior during hot deformation of high temperature titanium alloy Ti65

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Journal of materials Science & technology 2020年第14期47卷 56-69页

作者： Zhixin Zhang Jiangkun Fan Bin Tang Hongchao Kou Jian Wang Xin Wang Shiying Wang Qingjiang Wang Zhiyong Chen Jinshan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’anShaanxi710072China national&local joint engineering research center for precision thermoforming technology of advanced metal materials Xi’anShaanxi710072China Baoti Group Ltd. BaojiShaanxi721014China School of materials Science and engineering Changzhou UniversityChangzhouJiangsu213164China Institute of metal research Chinese Academy of SciencesShenyangLiaoning 110016China

Although the development of titanium alloys with working temperatures above 600?C faces enormous difficulties and challenges,the related research has not *** the present work,detailed analyses on microstructure evolution and hot deformation behavior of a new temperature resistant 650?C titanium alloy Ti65 were investigated from micrometer scale to nanometer *** results revealed that lamellarαgrains gradually fragmentized and spheroidized during theα+βphase region compression and the orientation of the c-axis ofαgrains gradually aligned to radial directions,forming two high Schmid factors(SFs)value texture eventually with the increase of strain to ***,there were some strengthening characters in theα+βphase region such as lenticularαsand nano silicide(TiZr)6 *** theβphase region,fine equiaxed dynamic recrystallized(DRX)βgrains were ***,the variant selection ofαm′artensite followed Burgers orientation relationship during the compression *** main deformation mechanisms of theα+βphase region were dislocation slip and orientation dependent ***,the deformation process in theβphase region was controlled byβgrain ***,many nano scale FCC twins were generated at the interface ofαl′ath during deforming in theβphase region,which was firstly observed in Ti65 alloy.

关键词： High temperature titanium alloy Hot deformation Microstructure evolution Texture FCC twin

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Orientation dependent behavior of tensile-creep deformation of hot rolled Ti65 titanium alloy sheet

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Journal of materials Science & technology 2021年第16期75卷 265-275页

作者： Zhixin Zhang Jiangkun Fan Ruifeng Li Hongchao Kou Zhiyong Chen Qingjiang Wang Hailong Zhang Jian Wang Qi Gao Jinshan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China national local joint engineering research center for precision thermoforming technology of advanced metal materials Xi'an 710072China Baoji Titanium Industry Co. Ltd.Baoji 721014China Institute of metal research Chinese Academy of SciencesShenyang 110016China Baoti Group Co. Ltd.Baoji 721014China

The mill products like sheet always have one or more severe textures inevitably,and its effect on mechanical properties is not a negligible *** orientation dependent tensile-creep behavior induced by rolling texture of Ti65 titanium alloy sheet has been systematically investigated at 650℃.There are some anisotropic characteristics between TD and RD of Ti65 *** UTS and TYS of TD are higher than RD at 650℃.Besides,the creep endurance time of TD(172.6–174.5 h)is about three times longer than RD(55.6–65.1 h)at 650℃and 240 ***,the grains are inclined to form Texture III■after creep along with TD,but to form Texture I■after creep along with ***,the crack initiation site is different during creep in TD and *** reason for anisotropic properties of tensile and creep has been summarized in two aspects:(i)the change of the SFs(Schmid factors)value between TD and RD;(ii)the difference of creep mechanism between TD(grain boundary sliding)and RD(dislocation slip).Anisotropy of Ti65 sheet should be fully considered to increase structural efficiency in the engineering design and application.

关键词： Titanium alloy Texture Anisotropy Tensile Creep

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