Hydro assisted tube pressing as a new severe plastic deformation method for producing high strength tubes

Document Type : Original Article

Authors

1 Department of Mechanical Engineering, Noshirvani University of Technology

2 Department of Materials Engineering, Noshirvani University of Technology

Abstract

Severe plastic deformation has been attracted the attention of researchers during the last couple of decades as a method to produce fine grain materials with high strength. In this study a new technique, called hydro assisted tube pressing (HATP), is proposed for severe plastic deformation of tubular materials. In this technique, unlike conventional methods, the fluid pressure is employed instead of die and mandrel, to maintain the geometry of the tube, and also to eliminate the die and tube surface contacts, making the required force in this process independent of the length of the tube. Each pass of the HATP process involves two half-cycles that by passing the tube through the deformation channel during the first and second half-cycle, respectively, the tube’s diameter increases and decreases and imposing a plastic strain on the tube. Finite element simulation results showed that the force required in this technique is 60% less than that in the PTCAP technique for AL1050 with the specified dimensions. In this proposed technique, by increasing the length of the tube, the force will not increase, which is one of the advantages of this method for producing high strength tubes with large dimensions. The experiments on AA1050 tubular specimens showed that the yield and ultimate tensile strengths increase from 51 and 65 MPa to 78 and 96 MPa, respectively, after two passes of HATP. Moreover, the micro-hardness tests on the samples after three half-cycles showed an increase in the hardness from 28 to 35 HV.

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Iranian Journal of Manufacturing Engineering
Volume 7, Issue 5
July 2020
Pages 1-13

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