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| 1 | Sensitivity Analysis Based Multiple Objective Preform Die Shape Optimal Design in Metal Forging显示文摘多重客观预先形成设计优化被提出。finalforging 的形状和变丑一致性在多重目的被考虑。目的是优化形状和同时的最后的前进的变丑一致性以便更多高集成前进的期末考试的质量能被获得。全部的目的被形状和一致性目的用增加方法的重量装配。预先形成死形状被立方的 B 花键曲线介绍。B 花键曲线的控制点被用作设计变量。全部的客观功能,形状和一致性 sub-objectivefunction 的形式被给。关于设计变量的全部的客观功能和 sub-objectivefunctions 的敏感被开发。用这个方法,预先形成死一个塑造 H 的前进过程的形状最佳地被设计。优化结果是很令人满意的。 | Xinhai ZHAO Guoqun ZHAO Guangchun WANG Tonghai WANG | 2006 | Journal of Materials Science & Technology2006，22，2： | 10 |
| 2 | Microstructure evolution of spray deposited and as-cast 2195 Al-Li alloys during homogenization显示文摘In this paper,a comparative study on the spray deposited and as-cast 2195 alloy was carried out to reveal their microstructure evolutions and differences during the homogenization process.The dissolution of the secondary particles and the diffusion of solute were studied based on microstructure characterization and kinetics analysis.The precipitation behavior of Al3Zr dispersoids and its influence on recrystallization were investigated by using TEM and EBSD characterization.It was found that the large-size particles at triangular grain boundaries dissolve slower than the intragranular phases and other grain boundary phases.The required homogenization time depends on the dissolution processes of the large-size phases at grain boundaries.The size of grain boundary phases in the spray deposited alloy is much smaller than that in the as-cast alloy,so the homogenization time required for the spray deposited alloy is significantly shorter.Two-stage and ramp heating homogenization processes can promote the precipitation of Al3Zr dispersoids in the two alloys.In the spray deposited alloy,the dispersoids tend to precipitate at the positions of the T1 plates dissolved,which causes a non-uniform distribution and decreases the recrystallization resistance of the alloy.However,the distribution of the dispersoids in the as-cast alloy is more uniform after the homogenization,which brings a stronger inhibition on the recrystallization.According to the microstructural characterization and kinetics analysis results,it can be concluded that the homogenization with a slow ramp heating is suitable for the two 2195 alloys,and a shorter holding time can be used for spray deposited alloy,e.g.12 h at 500℃,while the holding time for the as-cast alloy is no less than 35 h at 500℃. | Yongxiao Wang Xinwu Ma Guoqun Zhao Xiao Xu Xiaoxue Chen Cunsheng Zhang | 2021 | Journal of Materials Science & Technology2021，，23： | 7 |
| 3 | Achieving three-layered Al/Mg/Al sheet via combining porthole die co-extrusion and hot forging显示文摘Al/Mg/Al sheet with good bonding quality and mechanical properties was fabricated based on the proposed porthole die co-extrusion and forging(PCE-F)process.There were no voids,cracks or other defects on the Al/Mg interface.A continuous diffusion zone with two-sub-layer structure was formed across the Al/Mg interface,and its width increased with higher temperature or reduction ratio.The sub-layers formed at low and high temperature were identified to be solid solutions and intermetallic compounds(IMCs)including y-MgpAl^and^-Al3Mg.In Al layer,the welding zone mainly consisted of fine equiaxed grains with several coarse elongated grains,while the majority of matrix zone is coarse elongated grains.The rolling textures were dominated in both welding and matrix zones.In Mg layer,the welding zone exhibited complete DRXed grain structure,while several unDRXed coarse grains were observed in the matrix zone.With the increasing temperature,the grain size of Al and Mg layer firstly decreased and then increased.High reduction ratio strongly refined the grain structure of Al layer,while slightly affected the Mg layer.The Al/Mg/AI sheet experienced stress-drops twice during the tensile test.The first stress-drop was determined by the IMCs and microstructure of Mg layer,while the second stress-drop was closely related to the microstructure of Al layer.Al/Mg/Al sheet forged at the lowest temperature without the formation IMCs exhibited the highest stress for the first stress-drop,and that forged under the highest reduction ratio with the smallest grain size in Al layer had the highest stress for the second stress-drop. | Jianwei Tang Liang Chen Guoqun Zhao Cunsheng Zhang Lu Sun | 2020 | Journal of Magnesium and Alloys2020，8，3： | 6 |
| 4 | Temperature change and stress distribution analysis of die surface in Al-alloy die casting process and experimental study on die heat check显示文摘The temperature change of the die surface in practical aluminum alloy die casting process was analyzed,and a 2D model was formulated on the basis of a deep concave round cavity without sliding core to analyze thestress distributions along the die surface in detail. Equipment was designed to test the thermal state of the die steelin different thermal loading conditions. The results of stress analysis showed that, the value of thermal stress (maximum1.5 GPa) caused in the die filling and die spraying stages was larger than the mechanical stress (maximum 85 MPa)caused in the die locking stage. The results of the thermal check experiment showed that there were three stages ofdie dissolving, and that the stress distribution shown by the samples' cracking routine was close to the die surfacestress analysis. | Hu Xinping Zhao Guoqun Wu Bingyao | 2008 | China Foundry2008，5，1： | 6 |
| 5 | Hot Extrusion Processing of Al–Li Alloy Profiles and Related Issues:A Review显示文摘Al-Li alloy is a new structural material with the advantages of lightweight and high strength.The extrusion profiles of Al-Li alloy are widely used in aerospace and other fields,which can significantly reduce the weight of the aerospace equipment and improve their carrying capacity and service performance.Particular service conditions of structural components in aeronautical and space areas put forward strict requirements on microstructure,mechanical properties,and dimensional precision of Al-Li alloy profiles.Therefore,it places higher requirements on the shape forming and microstructure controlling of the Al-Li alloy profiles.The manufacturing process of the profiles involves billet homogenization,hot extrusion,solution and quenching treatments,artificial aging,and others.The parameters of each process as well as the die structure have important effects on the final performance of the profiles.This article summarizes the main applications and key mechanical properties of Al-Li alloy extrusion profiles.The technologies related to the manufacturing process of the extrusion profiles are summarized and analyzed.The related studies about the evolutions of the microstructure and mechanical properties during homogenization and extrusion processes are reviewed.The developments of the solid solution and quenching treatments as well as the aging strengthening technology for extruded Al-Li alloy profiles are also introduced.The scientific problems and key technologies that need to be solved in the manufacturing of Al-Li alloy extrusion profiles are presented,and the prospect for future development trends in these fields is given. | Yongxiao Wang Guoqun Zhao | 2020 | Chinese Journal of Mechanical Engineering2020，33，4： | 4 |
| 6 | Formation mechanism and evolution of surface coarse grains on a ZK60 Mg profile extruded by a porthole die显示文摘Porthole die extrusion of Mg alloys was studied by means of experimental and numerical studies. Results indicated that an inhomogeneous microstructure formed on the cross-section of the extruded profile. On the profile surface, abnormal coarse grains with an orientation of <11-20> in parallel to ED(extrusion direction) appeared. In the profile center, the welding zone was composed of fine grains with an average size of 4.19 um and an orientation of <10-10> in parallel to ED, while the matrix zone exhibited a bimodal grain structure. Disk-like, near-spherical and rod-like precipitates were observed, and the number density of those features was lower on the profile surface than that in the profile center. Then, the formation and evolution of coarse grains on the profile surface were investigated, which were found to depend on the competition between static recrystallization and grain growth. The stored deformation energy was the factor dominating the surface structure through effective regulation over nucleation of the precipitates and recrystallization. A profile with a low stored deformation energy suppressed formation of precipitates and consequently facilitated grain growth rather than recrystallization, resulting in the formation of abnormal coarse grains. Finally, the surface coarse grains contributed detrimentally to hardness, tensile properties, and wear performance of the bulk structure. | Jianwei Tang Liang Chen Guoqun Zhao Cunsheng Zhang Xingrong Chu | 2020 | Journal of Materials Science & Technology2020，47，12： | 3 |
| 7 | Rationally exfoliating chitin into 2D hierarchical porous carbon nanosheets for high-rate energy storage显示文摘Two-dimensional(2D)carbon nanomaterials with hierarchical porous structure and heteroatoms doping are highly desirable in the fields of energy storage because of their rich active surface and open ion diffusion channels.However,the scalable preparation of carbon materials simultaneously possessing ultrathin 2D feature and hierarchical pores remains a considerable challenge.Herein,a facile one-step method to massively fabricate 2D porous chitin nanosheets(coded as PCNs)via a phytic acid assisted top-down exfoliation of bulk chitin under hydrothermal treatment was presented.Subsequently,2D carbon nanosheets with extra-thin thickness(3.6 nm),well-defined hierarchical porosity,high specific surface area(855 m2·g^-1),as well as abundant self-doped heteroatoms(N,O,P)were fabricated by carbonizing the PCNs,and was named as HPCNs.The as-obtained HPCNs demonstrated remarkable electrochemical performance as electrode material for supercapacitors.The symmetric supercapacitors(SSCs)based on HPCNs exhibited a high specific capacitance of 79 F·g^-1(316 F·g^-1 for single electrode)in 6 M KOH aqueous electrolyte solution,as well as a remarkable energy density of 23.8 W·h·kg^-1 by using 1 M Li2SO4 as electrolyte.It is also demonstrated that HPCNs/PCNs hybrid dispersions can be used as inks to fabricate conductive films and energy devices with high strength and superior flexibility.This work paves a new avenue for the economical and large-scale synthesis of 2D hierarchically porous carbon materials for energy storage related applications. | Lingfeng Gao Guoqun Zhang Jie Cai Liang Huang Jun Zhou Lina Zhang | 2020 | Nano Research2020，13，6： | 2 |
| 8 | Adaptive generation of hexahedral element meshes for finite element analysis of metal plastic forming process显示文摘 | Zhang Hongmei Zhao Guoqun | 2009 | Comput Mater Sci2009，46，3： | 1 |
| 9 | Effect of extrusion stem speed on extrusion process for a hollow aluminum profile 显示文摘 | Zhang Cunsheng Zhao Guoqun Chen Zhiren | 2012 | Materials Science and Engineering B2012，177，： | 1 |
| 10 | Active control of structural vibration by piezoelectric tack actuators 显示文摘 | NIU Jun Chuan Zhao Guoqun HU Xia Xia | 2005 | Journal of Zhejiang University Sciences A2005，6，9： | 1 |
| 11 | Research on optimization design of the heating/cooling channels for rapid heat cycle molding based on response surface methodology and constrained particle swarm optimization显示文摘 | Guilong Wang Guoqun Zhao Huiping Li Yanjin Guan | 2010 | Expert Systems With Applications2010，，6： | 1 |
| 12 | FEM simulation of quenching process and experimental verification of simulation results 显示文摘 | Li Huiping Zhao Guoqun | 2007 | Materials science & technology A (S0928-4931)2007，452，4： | 1 |
| 13 | Finite element method based simulation of stress-strain field in the quenching process显示文摘 | Li Huiping Zhao Guoqun He Lianfang | 2008 | Materials Science and Enginee-ring A2008，478，12： | 1 |
| 14 | Solution of non-linear thermal transient problems by a new adaptive time-step method in quenching process 显示文摘 | LI Huiping ZHAO Guoqun HE Lianfang | 2009 | Applied Mathematical Modeling2009，33，1： | 1 |
| 15 | A mixed hardening rule coupled with Hill48' yielding function to predict the springback of sheet U-bending显示文摘 | Tang Bingtao Zhao Guoqun Wang Zhaoqing | 2008 | International Journal of Material Forming2008，，3： | 1 |
| 16 | Solution of non-linear thermal transient problems by a new adaptive time-step method in quenching process显示文摘 | Li Huiping Zhao Guoqun He Lianfang | 2009 | Applied Mathematical Modelling2009，33，1： | 1 |
| 17 | Numerical simulation of bubble growth in a limited amount of liquid显示文摘 | Xu Xingming Zhao Guoqun Li Huiping | 2010 | Engineering Reseach Center for Mold Die Technologies2010，116，3： | 1 |
| 18 | Research of thermal response simulation and mold structure optimization for rapid heat cycle molding pro-cess, respectively,with steam heating and electric heat-ing显示文摘 | GUILONG WANG GUOQUN ZHAO HUIPING LI | | 0，，31： | 1 |
| 19 | Inverse heat conduction analysis of quenching process using finiteelement and optimization method显示文摘 | Li Huiping Zhao Guoqun Niu Shanting | 2006 | Finite Elements in Analysis and Design2006，42，12： | 1 |
| 20 | Multiobjective Optimization Design of Porthole Extrusion Die Using Pareto-based Genetic Algo- rithm显示文摘 | Zhao Guoqun Chen Hao Zhang Cunsheng | 2013 | International Joural of Advanced Manu- facturing Technology2013，69，： | 1 |
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