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H. Jafarzadeh,K. Abrinia 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.2
A novel severe plastic deformation (SPD) technique entitled repetitive tube expansion and shrinking (RTES) has been developed tofabricate ultra-fine grained and nanostructured AZ91 tubular components. This method includes two different half-cycles and is based onpressing a tubular part through an angular channel die with two shear zones. In order to primarily demonstrate the deformation behaviorand refinement ability of RTES method, the FE simulations and experimental analyses were both done. Analytical calculations and FEsimulations of this method accompanied by Abaqus/explicit indicate that the large amount of equivalent plastic strain of 5.8 is imposed ineach cycle. In experimental investigations of a single-cycle of RTES, microstructural observations showed a significant grain refinementfrom the initial value of ~150 μm to ~700 nm. The distribution characteristic of refinement and hardness were consistent with that ofsimulated effective strain. This novel SPD method seems to be very promising for future commercial practice.