Journal of South China University of Technology (Natural Science Edition) ›› 2013, Vol. 41 ›› Issue (3): 90-94.doi: 10.3969/j.issn.1000-565X.2013.03.013

• Mechanical Engineering • Previous Articles     Next Articles

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. 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
  • Received:2012-08-15 Revised:2012-10-28 Online:2013-03-25 Published:2013-02-01
  • Contact: 夏琴香(1964-)，女，博士，教授，主要从事精密成形与模具计算机技术研究． E-mail:meqxxia@scut.edu.cn
  • About author:杨保健(1982-)，男，博士生，主要从事精密成形与模具计算机技术研究．E-mail:kurt.yang@163.com
  • Supported by:

    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)

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Abstract:

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 theresearch objective,and the metal flow mechanism during the strong stagger spinning was qualitatively and quantitativelyinvestigated by analyzing the fan-shaped plastic flow field in the section and surface of the deformation area ofsteel 20.Then,the evolution of grain morphology of steel F + P during the severe shear deformation caused by powerspinning was discussed by means of metallographic analysis and TEM.The results show that,like other severeplastic deformation technologies,power spinning results in the stretching of isometric crystals in axial direction withthe increasing thinning ratio of wall thickness,which helps to form cold deformation texture with certain orientationdegree and to further generate tiny isometric ferritic 600 nm grains during the annealing at 580℃ for 1 hour.

Key words: nano /ultrafine grain, power spinning, cylindrical part, shear deformation, grain size

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