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Heat Treatment of Centrifugally Cast High-Vanadium alloy Steel for High-Pressure Grinding Roller

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Acta Metallurgica Sinica(English Letters) 2014年第3期27卷 430-435页

作者： Haizhi Li Weiping Tong Junjun Cui Hui Zhang Liqing Chen Liang Zuo key laboratory for Electromagnetic processing of Materials(Ministry of Education) Northeastern University State key laboratory of Rolling and Automation Northeastern University key laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials and MetallurgyNortheastern University

The roller is one of the main parts of a high-pressure grinding roller, which is a type of highly efficient ore crushing equipment. Its working life is strongly affected by the materials used. In this paper, a new kind of roller material, the high-vanadium alloy steel （HVAS）, was investigated. The results showed that the as-cast microstructures of the HVAS roller contained martensite, residual austenite, and alloy carbides. The HVAS sample quenched at 1,080 ℃ had a high hardness, and it had much higher compressive strength and abrasive wear resistance after tempering at 560 ℃ for 30 rain. The mechanical properties of the HVAS are more sufficient than the existing roller materials, which are feasible for larger machine design.

关键词： High-vanadium alloy steel Heat treatment High-pressure grinding roller Compressive strength Abrasive wear resistance

Effects of different additives on microstructure and properties of Al–Zn–Mg–Cu alloys prepared by laser-directed energy deposition

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Progress in Natural Science:Materials International 2023年第6期33卷 812-824页

作者： Yin Wang Yong Li Wei Yu Chen He Haiyao Wang Guangming Xu Jiadong Li State key laboratory of Rolling and Automation Northeastern University key laboratory of Electromagnetic processing of Materials Ministry of Education Northeastern University Guangxi Advanced Aluminum processing Innovation Center Co.LTD Shenyang Institute of Automation Chinese Academy of Sciences

There are always microcracks and pores during the laser additive manufacturing of 7xxx aluminum alloy,which significantly limits its performance improvement and *** work uses additives to suppress defects and improve the alloy's *** three alloys were prepared by the addition of silicon,TiN,or *** microstructure and mechanical properties were investigated in *** results show that silicon can inhibit the crack generation by reducing the solidification *** grain size is *** can refine the grain and it creates *** addition of both can restrain the defects,refine the grains and obtain good comprehensive ***,the hardness and wear resistance of A3 are slightly lower than A2 due to the brittle phase generated by the addition of *** yield strength,tensile strength,elongation,hardness and wear rate of A3 alloy treated by T6 are 214.8 MPa,262.8 MPa,2.59 %,130.9 HV and 2.24 × 10-3mm3/（N·m）.

关键词： Laser additive manufacturing Metal matrix composites Al–Zn–Mg–Cu alloys Microstructure Tensile property Friction property

A High-Capacity Ammonium Vanadate Cathode for Zinc-Ion Battery

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Nano-Micro Letters 2020年第5期12卷 153-164页

作者： Qifei Li Xianhong Rui Dong Chen Yuezhan Feng Ni Xiao Liyong Gan Qi Zhang Yan Yu Shaoming Huang Guangzhou key laboratory of Low-Dimensional Materials and Energy Storage Devices School of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006People’s Republic of China Hefei National laboratory for Physical Sciences at the Microscale Department of Materials Science and EngineeringCAS Key Laboratory of Materials for Energy ConversionUniversity of Science and Technology of ChinaHefei 230026People’s Republic of China key laboratory of Materials processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002People’s Republic of China aviation Fuel Research and Development Center China National Aviation Fuel Group LimitedBeijing 102603People’s Republic of China Department Institute for Structure and Function and of Physics Chongqing UniversityChongqing 400030People’s Republic of China Dalian National laboratory for Clean Energy(DNL) Chinese Academy of SciencesDalian 116023LiaoningPeople’s Republic of China State key laboratory of Fire Science University of Science and Technology of ChinaHefei 230026People’s Republic of China

Given the advantages of being abundant in resources,environmental benign and highly safe,rechargeable zinc-ion batteries(ZIBs)enter the global spotlight for their potential utilization in large-scale energy *** their preliminary success,zinc-ion storage that is able to deliver capacity>400 mAh g^-1 remains a great ***,we demonstrate the viability of NH4V4O10(NVO)as high-capacity cathode that breaks through the bottleneck of ZIBs in limited *** first-principles calculations reveal that layered NVO is a good host to provide fast Zn^2+ions diffusion channel along its[010]direction in the interlayer *** the other hand,to further enhance Zn^2+ion intercalation kinetics and long-term cycling stability,a three-dimensional(3D)flower-like architecture that is self-assembled by NVO nanobelts(3D-NVO)is rationally designed and fabricated through a microwave-assisted hydrothermal *** a result,such 3D-NVO cathode possesses high capacity(485 mAh g^-1)and superior long-term cycling performance(3000 times)at 10 A g^-1(~50 s to full discharge/charge).Additionally,based on the excellent 3D-NVO cathode,a quasi-solid-state ZIB with capacity of 378 mAh g^-1is developed.

关键词： Zinc-ion battery Ammonium vanadate NH4V4O10

Mechanical properties and thermal deformation behavior of low-cost titanium matrix composites prepared by a structure-optimized Y_(2)O_(3) crucible

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Journal of Iron and Steel Research International 2024年第3期31卷 738-751页

作者： Qian Dang Gang Huang Ye Wang Chi Zhang Guo-huai Liu Zhao-dong Wang The State key laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina School of Materials Science and Chemical Engineering Harbin University of Science and TechnologyHarbin 150004HeilongjiangChina School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870LiaoningChina

A porous yttrium oxide crucible with both thermal shock resistance and erosion resistance was developed by structural *** structure-optimized yttrium oxide crucible was proved to be suitable for melting highly reactive titanium ***-cost(TiB+Y2O_(3))-reinforced titanium matrix composites were prepared by vacuum induction melting using the prepared *** thermal deformation behavior and microstructure evolution of(TiB+Y2O_(3))-reinforced tita-nium matrix composites were investigated at deformation temperatures of 900-1100℃with strain rates of 0.001-1 *** results showed that the prepared yttrium oxide crucible had both thermal shock and erosion resistance,the low-cost titanium matrix composites could be prepared by the developed yttrium oxide crucibles which were homogeneous in composition and highly sensitive to strain rate and deformation temperature,and the peak and theological stresses decreased with increasing deformation temperature or decreasing strain *** addition,the average thermal deformation activation energy of the composites was calculated to be 574.6 kJ/mol by establishing the Arrhenius constitutive equation in consideration of the strain variables,and the fitting goodness between the predicted stress value and the measured value was 97.624%.The calculated analysis of the hot processing map showed that the best stable thermal deformation zone was located in the deformation temperature range of 1000-1100℃and strain rate range of 0.001-0.01 s^(-1),where the peak dissipation coefficient wasη=71%.In this zone,the deformation of the reinforcement and matrix was harmonious,the reinforcement was less likely to fracture,dynamic recrystallization occurred more fully and the alloy exhibited near steady rheological characteristics.

关键词： Yttrium oxide crucible Titanium matrix composite Thermal deformation behavior Constitutive equation Hot processing map Microstructure evolution

Data-driven design of novel lightweight refractory high-entropy alloyswith superb hardness and corrosion resistance

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npj Computational Materials 2024年第1期10卷 536-548页

作者： Tianchuang Gao Jianbao Gao Shenglan Yang Lijun Zhang State key laboratory of Powder Metallurgy Central South UniversityChangshaHunanChina State key laboratory of Materials processing and Die&Mould technology Huazhong University of Science and TechnologyWuhanHubeiChina National Engineering Research Center for Magnesium alloys Chongqing UniversityChongqingChina

lightweight refractory high-entropy alloys(LW-RHEAs)hold significant potential in the fields of aviation,aerospace,and nuclear energy due to their low density,high strength,high hardness,and corrosion ***,the enormous composition space has severely hindered the development of novel LW-RHEAs with excellent comprehensive *** this paper,an machine learning(ML)-based alloy design strategy combined with a multi-objective optimization method was proposed and applied for a rational design of Al-Nb-Ti-V-Zr-Cr-Mo-Hf *** quantitative relation of“composition-structure-property”was first established by ML ***,feature analysis reveals that Cr content greater than 12 at.

关键词： corrosion alloys resistance

Microstructure evolution of peritectic Al–18 at.%Ni alloy directionally solidified in high magnetic fields

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Journal of Materials Science & technology 2021年第17期76卷 51-59页

作者： Yubao Xiao Tie Liu Yuxin Tong Meng Dong Jinshan Li Jun Wang Qiang Wang key laboratory of Electromagnetic processing of Materials(Ministry of Education) Northeastern UniversityShenyang 110819China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China The State key laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China State key laboratory of Solidification processing Northwestern Polytechnical UniversityXi'an 710072China

The effect of a high magnetic field on the microstructural evolution of a peritectic Al—18 at.%Ni alloy during directional solidification and its dependence on pulling speed were *** a low pulling speed,the application of a 2 T magnetic field triggered the appearance of a primary Al_(3)Ni_(2)*** higher pulling speeds,a high magnetic field application induced primary Al_(3)Ni_(2)phase segregation that formed close to the central alloy *** all pulling speeds,the application of a high magnetic field induced bulk Al_(3)Ni/Al eutectic formation on the upper and lower parts of the alloys,and promoted elongated growth of the peritectic Al_3Ni phase along the magnetic field *** analysis indicated that microstructural evolution that was induced by high magnetic fields can be attributed to solute migration and melt flow that is regulated by magnetic,Lorentz,and thermoelectric magnetic forces and their coupling effects during peritectic solidification.

关键词： High magnetic field Peritectic reaction Directional solidification Microstructure

Ductile and ultrahigh-strength eutectic high-entropy alloys by large-volume 3D printing

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Journal of Materials Science & technology 2022年第31期126卷 15-21页

作者： Yiping Lu Xiaoxiang Wu Zhenghong Fu Qiankun Yang Yong Zhang Qiming Liu Tianxin Li Yanzhong Tian Hua Tan Zhiming Li Tongmin Wang Tingju Li High Entropy alloy Material Engineering Research Center(liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China School of Iron and Steel Soochow UniversitySuzhou 215137China School of Materials Science and Engineering Central South UniversityChangsha 410083China key laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China State key laboratory of Solidification processing Northwestern Polytechnical UniversityXi’an 710072China

*** Additive manufacturing or 3D printing outweighs conventional casting methods in the aspect of complex parts fabrication,which can realize one-step formation without the need of complicated cast dies.3D printing significantly promotes industrial production for making near-net shaped ***,this promising technique is not always ideally applicable for metals and *** example,titanium alloys prepared by 3D printing often suf-fer from poor plasticity,and usually require further complex heat treatment or hot isostatic pressing treatment,in order to remove internal stress and regulate plasticity and strength[1,2],which de-feats the original intention of employing additive *** of the fundamental causes for such issues is the low fluidity of the alloys upon melting,leading to great chemical heterogeneity,high porosity content and residual *** limitation hinders further design and fabrication of high-performance printable alloys from large scale production and application.

关键词： alloys strength eutectic

Effect of Cu on microstructure,mechanical properties,and texture evolution of ZK60 alloy fabricated by hot extrusion−shearing process

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Transactions of Nonferrous Metals Society of China 2020年第6期30卷 1511-1523页

作者： Shuai DAI Feng WANG Zhi WANG Zheng LIU Ping-li MAO School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China key laboratory of Magnesium alloys and the processing technology of liaoning Province Shenyang 110870China

As-cast Mg-6Zn-xCu-0.6Zr(x=0,0.5,1.0,wt.%)alloys were fabricated by permanent mold casting;then,the alloys were subjected to homogenization heat treatment and extrusion-shearing(ES)*** microstructure and mechanical properties of the alloys were evaluated by OM,SEM/EDS,XRD,TEM,EBSD and tensile *** results show that the hard MgZnCu phase in Cu-added alloy can strengthen particle-stimulated nucleation(PSN)effect and hinder the migration of dynamic recrystallization(DRX)grain boundary at an elevated temperature during *** ZK60+0.5Cu alloy shows an optimal tensile strength–ductility combination(UTS of 396 MPa,YS of 313 MPa,andδ=20.3%)owing to strong grain boundary strengthening and improvement of Schmid factor for{0001}■basal *** aggregation of microvoids around the MgZnCu phase mainly accounts for the lower tensile elongation of ZK60+1.0Cu alloy compared with ZK60 alloy.

关键词： Mg-Zn-Cu-Zr alloy extrusion-shearing process microstructure characterization mechanical properties texture evolution strengthening mechanism

Fabrication of fine-grained,high strength and toughness Mg alloy by extrusion−shearing process

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Transactions of Nonferrous Metals Society of China 2021年第3期31卷 666-678页

作者： Bo-ning WANG Feng WANG Zhi WANG Zheng LIU Ping-li MAO School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China key laboratory of Magnesium alloys and processing technology of liaoning Province Shenyang 110870China

A novel extrusion-shearing(ES) composite process was designed to fabricate fine-grained, high strength and tough magnesium alloy. The structural parameters of an ES die were optimized by conducting an orthogonal simulation experiment using finite element software Deform-3D, and Mg-3 Zn-0.6 Ca-0.6 Zr(ZXK310) alloy was processed using the ES die. The results show that the optimized structural parameters of ES die are extrusion angle(α) of 90°, extrusion section height(h) of 15 mm and inner fillet radius(r) of 10 mm. After ES at an extrusion temperature and a die temperature of 350 °C, ZXK310 alloy exhibited good ES forming ability, and obvious dynamic recrystallization occurred in the forming area. The grain size decreased from 1.42 μm of extrusion area to 0.85 μm of the forming area. Owing to the pinning of second phase and formation of ultrafine grains, the tensile strength, yield strength and elongation of alloy reached 362 MPa, 289 MPa and 21.7%, respectively.

关键词： Mg−Zn−Ca−Zr alloy extrusion−shearing process die design dynamic recrystallization mechanical properties