The effects of die geometry in tube channel pressing: Severe plastic deformation

Abstract

The effects of die geometry on the deformation behavior of aluminum 6061 alloy tube in a novel severe plastic deformation (SPD) process called tube channel pressing (TCP) were studied using the Abaqus 6.10 software. Using the optimized die geometry, 1 to 3 passes of TCP is imposed not only to validate the simulation results, but also to investigate the performance of TCP as a SPD process. The finite element method (FEM) simulation results show that the moderated plastic strain, the lower inhomogeneity in distribution of plastic strain, and the lower risk of fracture during process can be obtained using the proper die geometry. In addition, the imposed strain is a mixture of shear strain and hoop strain accompanying with little bending strain which makes it relatively different from conventional SPD processes. Experiments shows that the experimentally obtained load-displacement curve of TCP is very close to its FEM predicted counterpart which validates the FEM simulation results. Additionally, after imposing of 3 passes of TCP to 6061 alloy, the grain size of the tube is decreased from a few tens of microns to less than 1 mm while the yield strength is increased from 110 MPa to 325 MPa which show the capability of TCP as a SPD process for tubes.

Microstructure and mechanical properties of an Al–Mg–Si tube processed by severe plastic deformation and subsequent annealing

“…Therefore, consecutive shear strains also impose during TCP. The average equivalent plastic strain imposed by each pass of TCP using the die characterized by R die of 7.5 mm and ‫צ‬ die of 26° has been calculated about 1 by an FEM analysis [10].…”

“…Therefore, multiple studies have focused on SPD of these alloys [7][8][9][10][11][12][13][14][15][16][17][18][19]. However, the majority of these studies have considered Al-Mg-Si alloys in simple geometries (i.e.…”

“…Billets and Sheets) and SPD of extruded Al-Mg-Si products, such as tubes, has been less studied. Recently, a new SPD process called Tube Channel Pressing (TCP) has been developed to process tubular geometries [9][10]. Since precipitation hardening can be activated during the annealing treatment of Al-Mg-Si alloys [7,[12][13][14][15], the combination of TCP and post annealing of these alloys can be a good solution for development of tubes bearing an excellent strength and a good ductility.…”

Uncertainty analysis of residual stresses measured by slitting method in equal-channel angular rolled Al-1060 strips

“…Many scholars have developed varied SPD processes for components with different shapes. 14 Constrained groove pressing (CGP), 15 equal-channel angular pressing (ECAP), 16,17 tube channel pressing (TCP) 18 and repetitive tube expansion and shrinking (RTES) 19 are some of them.…”

Investigation of residual stress and mechanical properties of equal channel angular rolled St12 strips

“…Until now many types of SPD methods have been introduced and investigated. Equal channel angular pressing (ECAP), [1][2][3] high pressure torsion (HPT), [4][5][6] accumulative roll-bonding (ARB) process, [7][8][9] cyclic extrusion compression (CEC), 10 tube channel pressing (TCP), 11 repetitive tube expansion and shrinking (RTES), 12 cryorolling (CR) technique, 13 repetitive corrugated and straightening (RCS), 14 and constrained groove pressing (CGP) 15,16 are some of the SPD methods. Equal channel angular rolling (ECAR) process is another successful SPD method.…”