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| 1 | Application of digital pattern-less molding technology to produce art casting显示文摘Compared with the conventional casting process, digital pattern-less casting technology has many advantages such as good machining accuracy, a short processing cycle, and low production cost. It is a new rapid manufacturing technology for castings, integrated with CAD/CAM, casting, CNC machining and many other advanced technologies. With this digital casting technology, no pattern is needed for making molds; it is precise, f lexible, and green. Usually, art castings have complex structures and are made in small batches or even made in a single-piece, especially for large-sized art castings. So it has the shortcomings of high cost, low eff iciency and long time for making a pattern to produce art castings with the conventional casting processes. However, the digital pattern-less casting technology can be applied to fabricate art castings, since it can greatly shorten the manufacturing cycle and lower the production cost, thus having a very good prospect. In this study, based on the digital pattern-less casting technology, a plaque casting with artistic Chinese characters(a Chinese poem) was designed and manufactured, and the production process was demonstrated in detail. | Chen Li Zhang Wei Wu Chenhong Jia Baochang Xiang Qingchun Qiu Keqiang Li Rongde | 2014 | China Foundry2014，11，6： | 5 |
| 2 | Efects of minor amounts of scandium on microstructure and mechanical properties of ZA27 alloy显示文摘The influences of minor amounts of scandium on the microstructure and mechanical properties of as-cast ZA27 alloy have been experimentally investigated.The experimental results show that as far as the Sc addition is individually concerned,the refinement result of the as-cast ZA27 alloy with 0.5wt.%Sc addition is comparatively better.After alloying with minor amounts of Sc,the coarse dendrites of the ZA27 alloy are refined and transformed into the uniform and small equiaxed grain microstructure;also the eutectics among the grain boundaries become finer.The test results of mechanical properties show that the tensile strength and hardness of the as-cast ZA27 alloy containing 0.5wt.%Sc approach 495 MPa and 120.2 HB,increase by28.5%and 33.1%,respectively,compared with those of the ZA27 alloy with no addition of Sc element,while the elongation of the alloy is improved to 7.6%from 2.7%.The SEM,EDAX and XRD analyses show that in the ZA27 alloy,the trace element Sc combines with Al to form the square Al3Sc phase particles,which serve as heterogeneous nuclei,facilitating the refinement of the microstructure and the improvement of the mechanical properties of the alloy. | Xiang Qingchun Zhang Wei Wang Ruichun Qiu Keqiang Li Rongde | 2013 | China Foundry2013，10，5： | 1 |
| 3 | An ahemative semianalytical/analytical solution to field-to-wire coupling in an electrically large eavity显示文摘 | Zhang Huabin Zhao Xiang Luo Qingchun | 2012 | IEEE Trans- actions on Electromagnetic Compatibility2012，54，5： | 1 |
| 4 | Generation of gene-target dogs using CRISPR/Cas9 system显示文摘Dear Editor,Dogs(Canis familiaris)serve as human companions and are raised to herd livestock,aid hunters,guard homes,perform police and rescue work,and guide the blind.Dogs exhibit close similarities to humans in terms of metabolic,physiological,and anatomical characteristics,and thus are ideal genetic and clinical models to study human diseases(Tsai et al.,2007).Gene target technology is a powerful tool to create new strains of animals with favorable traits.However,thus far,gene-target dogs have not been developed due to their unique species-specific reproductive characteristics,which limits the applications of dogs especially in the field of biomedical research.Recently,clustered regularly interspaced short palindromic repeats(CRISPRs)/CRISPR-associated(Cas)9 system was applied to edit specific genes with a high efficiency(Cong et al.,2013;Mali et al.,2013).Here we attempt to explore the feasibility of producing gene knockout(KO)dogs by using this technology.Beagle dog,the most widely used breed in biomedical research,was used as our animal model.Myostatin(MSTN)was chosen as the first gene of interest. | Qingjian Zou Xiaomin Wang Yunzhong Liu Zhen Ouyang Haibin Long Shu Wei Jige Xin Bentian Zhao Sisi Lai Jun Shen Qingchun Ni Huaqiang Yang Huilin Zhong Li Li Minhua Hu Quanjun Zhang Zhidong Zhou Jiaxin He Quanmei Yan Nana Fan Yu Zhao Zhaoming Liu Lin Guo Jiao Huang Guanguan Zhang Jun Ying Liangxue Lai Xiang Gao | 2015 | Journal of Molecular Cell Biology2015，7，6： | 1 |
| 5 | An innovative tester system for measuring mechanical property of foundry molding sand显示文摘1 .Introduction Molding sand ProPerties are elosely relevant to castingquality.During molding Proeess,molding sand ProPertiesean direetly affeet the quality of molds ineluding strength,dimension aeeuracy of | ~*Zuxi XIE~1, Qingchun XIANG~1, Xu WANG~1, Dongmei LIU~2 (1.School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110023, Liaoning, P. R. China 2. Shenyang Machine Tool Co. Ltd., Shenyang 110025, Liaoning, P. R. China)being | 2004 | China Foundry2004，1，2： | 0 |
| 6 | Measurement of elastic modulus and evaluation of viscoelasticity of foundry green sand显示文摘Elastic modulus is an important physical parameter of molding sand; it is closely connected with molding sand’s properties. Based on theories of rheology and molding sand microdeformation, elastic modulus of molding sand was measured and investigated using the intelligent molding sand multi-property tester developed by ourselves. The measuring principle was introduced. Effects of bentonite percentage and compactibility of the molding sand were experimentally studied. Furthermore, the essential viscoelastic nature of green sand was analyzed. It is considered that viscoelastic deformation of molding sand consists mainly of that of Kelvin Body of clay membrane, and elastic modulus of molding sand depends mainly on that of Kelvin Body which is the elastic component of clay membrane between sands. Elastic modulus can be adopted as one of the property parameters, and can be employed to evaluate the viscoelastic properties of molding sand. | Qingchun XIANG Zuxi XIE Fengwen ZHANG | 2004 | China Foundry2004，1，1： | 0 |
| 7 | Effects of scandium and zirconium combination alloying on as-cast microstructure and mechanical properties of Al-4Cu-1.5Mg alloy显示文摘The influences of minor scandium and zirconium combination alloying on the as-cast microstructure and mechanical properties of Al-4Cu-1.5Mg alloy have been experimentally investigated.The experimental results show that when the minor elements of scandium and zirconium are simultaneously added into the Al-4Cu-1.5Mg alloy,the as-cast microstructure of the alloy is effectively modified and the grains of the alloy are greatly refined.The coarse dendrites in the microstructure of the alloy without Sc and Zr additions are refined to the uniform and fine equiaxed grains.As the additions of Sc and Zr are 0.4% and 0.2%,respectively,the tensile strength,yield strength and elongation of the alloy are relatively better,which are 275.0 MPa,176.0 MPa and 8.0% respectively.The tensile strength is increased by 55.3%,and the elongation is nearly raised three times,compared with those of the alloy without Sc and Zr additions. | Xiang Qingchun Zhao Jing Pan Haicheng Hou Lina Li Rongde | 2011 | China Foundry2011，8，1： | 0 |
| 8 | Sn60Pb40 solder powders produced by the planar flow casting atomization process显示文摘Conventional planar flow casting(PFC) is one of rapid solidification processes for the fabrication of microcrystalline or amorphous ribbons.Based on the conventional PFC process,the planar flow casting atomization(PFCA) process has been developed,which is a new rapid solidification process for the production of metal powder directly from alloy melts.A prototype experimental apparatus was designed and manufactured.With the apparatus,Sn60Pb40 alloy solder powders were prepared,and the effects of the main technological parameters on the powder size distribution and morphology were experimentally studied.The experimental investigations indicate that the metal powders produced by the PFCA process can be classified by velocity;and fine spherical tin-lead alloy solder powders can be fabricated by adjusting the technical parameters.The new PFCA process has such features as high productivity and efficiency,low energy consumption,simple operation,short technological process,and large gross yield. | Xiang Qingchun Zhao Jing Pan Haicheng Li Rongde | 2011 | China Foundry2011，8，2： | 0 |
| 9 | Morphology and microstructure of rapidly solidified tin-lead alloy powders显示文摘Sn60Pb40 alloy powders were fabricated using the planar flow casting(PFC) atomization process. By using OM, SEM and EPMA, the characteristics of the morphologies and microstructures of the powders have been investigated. It is observed that the environment of ambient gas in the atomization box has great effects on the morphology of the alloy powders. The microstructures of Sn60Pb40 alloy powders produced by the PFC atomization process are completely composed of eutectic, which is made up of both oversaturated α solid solution and β solid solution. The microstructures of small size powders are extraordinarily undeveloped dendritic eutectic, in which the large majority of the α phase appears nearly spherical, evidently since the cooling rate is higher and the under-cooling is larger. As for the large size powders, since the cooling rate and undercooling are relatively low, lamellar α phase apparently increases in the eutectic microstructures of these powders, and there is even typical lamellar eutectic structure clearly observed in some micro-areas. After remelting tests by DTA, the microstructures of small size powders are transformed, which become composed of large crumby α phase and eutectic(α+β), while those of large size powders change into classical tin-lead structures of primary α phase plus lamellar eutectic(α+β). By studying the microstructures of tin-lead alloy powders, a model has been proposed to predict the microstructure formation of Sn60Pb40 alloy powders. | Xiang Qingchun Zhang Wei Qiu Keqiang Qu Yingdong Li Rongde | 2014 | China Foundry2014，11，5： | 0 |
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