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《Journal of South China University of Technology(Natural Science Edition)》 2013-03
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Deformation Mechanism of Nano/Ultrafine Grained Cylindrical Parts Fabricated by Power Spinning

Yang Bao-jian1 Xia Qin-xiang1 Cheng Xiu-quan2 Xiao Gang-feng1(1.School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China; 2.Department of Aircraft Maintenance Engineering,Guangzhou Civil Aviation College,Guangzhou 510403,Guangdong,China)  
In order to explore the formation mechanism of nano/ultrafine grains during the power spinning of nano/ultrafine grained cylindrical parts,the body-centered cubic steel 20 with high stacking fault energy was taken as the research objective,and the metal flow mechanism during the strong stagger spinning was qualitatively and quantitatively investigated by analyzing the fan-shaped plastic flow field in the section and surface of the deformation area of steel 20.Then,the evolution of grain morphology of steel F+P during the severe shear deformation caused by po-wer spinning was discussed by means of metallographic analysis and TEM.The results show that,like other severe plastic deformation technologies,power spinning results in the stretching of isometric crystals in axial direction with the increasing thinning ratio of wall thickness,which helps to form cold deformation texture with certain orientation degree and to further generate tiny isometric ferritic 600 nm grains during the annealing at 580 ℃ for 1 hour.
【Fund】: 国家自然科学基金资助项目(51075153);; 广东省自然科学基金资助项目(10151040301000000)
【CateGory Index】: TG376
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