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Microstructure and properties of continuous casting Ag-28Cu-8Sn alloy fabricated by dieless drawing

Rare Metals 2020年第3期39卷 279-288页

作者： Ji-Heng Fang Ming Xie Ji-Ming Zhang You-Cai Yang Yong-Tai Chen Song Wang Man-Men Liu Jie-Qiong Hu State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metal Kunming650106China

Ag-28Cu-8Sn(wt%)alloy is a widely used brittle silver-based brazing filler *** wire of brazing filler metal was prepared by continuous casting process and dieless drawing *** phase structure was measured by X-ray diffraction(XRD),and the microstructure of wetting interface,cast states,processing states and fracture morphologies were characterized by the optical microscopy(OM)and scanning electron microscopy(SEM),*** electrical conductivity,hardness,tensile strength and elongation rate were tested as ***,the solid-liquid phase temperature was measured by a differential scanning calorimeter(DSC),and the wettability of brazing filler metal was tested by spreading *** outcomes obtained show that the as-cast microstructure is a typical three-zone structure,including region of surface fine grain,zone of columnar grain and region of center equiaxed ***-28Cu-8Sn alloy is mainly composed of Ag-rich a-phase,Cu-rich pphase and intermediate *** refinement appears in the cross section,as for grains of the longitudinal section,the shape is changed from ribbon to fiber to form a silk *** strength and hardness improve with the increase in the true strain,while the conductivity and elongation are ***,the solid-phase temperature is 605.9℃,and the liquid-phase temperature is 725.1℃.The spreading area of Ag-28Cu-8Sn brazing filler metal is 174 mm^2,and the metallurgical bonding occurs between Ag-28Cu-8Sn brazing filler metal and Cu *** addition,compared with cold drawing process,there are not any microcracks at the fracture morphology for the alloy fabricated by dieless *** dieless drawing process overcomes some processing defects of traditional cold drawing,and the processing performance of Ag-28Cu-8Sn alloy is improved.

关键词： Continuous casting Cold drawing dieless drawing Microstructure Properties

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Numerical Simulation of dieless Drawing Process with Non-steady Processing Parameters

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稀有金属材料与工程 2011年第S3期40卷 179-184页

作者： He Yong, Liu Xuefeng, Wang Zhen, Xie Jianxin University of Science and Technology Beijing, Beijing 100083, China Univ Sci & Technol Beijing Key Lab Adv Proc Technol Mat Minist Educ Beijing 100083 Peoples R China

Since processing parameters have always been assumed to be stable in the current finite element numerical simulation of dieless drawing process, the simulation results for the product dimension tend to stabilize gradually. In fact, the dimension fluctuation exists in the forming process all the while. A mathematical model of Gauss distribution for processing parameters was employed and a finite element numerical model of dieless drawing process with non-steady processing parameters was established. dieless drawing processing of Ni-Ti alloy wire was conducted for verifying the proposed model. The results indicated that the non-steady processing parameters model had higher simulation accuracy of the wire diameter than that given by the steady parameters model. Furthermore, the model could also be used to analyze the fluctuation characteristics in the whole dieless drawing process.

关键词： dieless drawing non-steady processing parameter thermal-mechanical coupling finite element numerical simulation Gauss distribution

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维普期刊数据库

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Deformation behavior of Cu-12wt%Al alloy wires with continuous columnar crystals in dieless drawing process

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Science China(Technological Sciences) 2009年第8期52卷 2232-2236页

作者： LIU XueFeng WU YuHui XIE JianXin Key Laboratory of Advanced Processing Technology of Materials of Ministry of Education University of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

The microstructure and mechanical properties of Cu-12wt%Al alloy wires which are composed of continuous columnar crystals after dieless drawing forming at drawing speed of 1.0―1.4 mm/s and deformation temperature of 600―900℃ were analyzed, and deformation behavior of the alloy during dieless drawing forming was experimentally investigated. The results showed that in the abovemen-tioned conditions, recrystallization phenomenon was not found during dieless drawing forming. When a drawing speed of 1.0 mm/s was used, the grain boundaries were out of straight gradually with increasing deformation temperature from 600℃ to 900℃, and tensile strength of the dieless drawn Cu-12wt%Al alloy wires increased while elongations decreased with increasing deformation temperature. At drawing speed of 1.1―1.2 mm/s and deformation temperature of 600℃, the effect of dieless drawing forming process on the microstructure of the alloy was inconspicuous, and when drawing speed was up to 1.3―1.4 mm/s, the grain boundaries of continuous columnar crystals became zigzag while there was little effect of drawing speed of 1.1―1.4 mm/s on the elongation and tensile strength of the alloy wires.

关键词： Cu-Al alloy continuous columnar crystals dieless drawing microstructure and mechanical properties

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Local Buckling-Induced Forming Method to Produce Metal Bellows

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Chinese Journal of Mechanical Engineering 2023年第1期36卷 104-114页

作者： Tianyin Zhang Dongqing Li Tianjiao Xu Yongfeng Sui Xianhong Han Institute of Forming Technology&Equipment School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200030China Hangzhou Steam Turbine&Power Group Co. LtdHangzhou310100China National Engineering Research Center of Die and Mold CAD Shanghai Jiao Tong UniversityShanghai200030China

A novel buckling-induced forming method is proposed to produce metal *** tube billet is firstly treated by local heating and cooling,and the axial loading is applied on both ends of the tube,then the buckling occurs at the designated position and forms a *** this paper,a forming apparatus is designed and developed to produce both discontinuous and continuous bellows of 304 stainless steel,and their characteristics are discussed ***,the influences of process parameters and geometric parameters on the final convolution profile are deeply studied based on FEM *** results suggest that the steel bellows fabricated by the presented buckling-induced forming method have a uniform shape and no obvious reduction of wall ***,the forming force required in the process is quite small.

关键词： Buckling-induced forming dieless No wall-thinning Stainless-steel bellows

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