Processing of hollow sections
A system and method provide a material with uniform micro-structure. In an embodiment, an equal channel angular extrusion system includes an interior mandrel. The interior mandrel includes an expanding shear material section and a contracting shear material section. In addition, the system includes a material. The material is disposed about a portion of the interior mandrel. Moreover, the system includes a pressure application device. The pressure application device applies pressure to the material to force the material to contact the expanding shear material section to provide an expanded post-shear material section. Pressure from the pressure application device applies pressure to the material to force the expanded post-shear material section to contact the contracting shear material section to provide a contracted shear material section.
1. An equal channel angular extrusion system, comprising:
an interior mandrel, wherein the interior mandrel comprises an expanding shear material section and a contracting shear material section and wherein the interior mandrel slides;
a material, wherein the material is disposed about a portion of the interior mandrel;
a wall, wherein the wall slides with the material and contacts an entire circumference of the material disposed within a wall pre-shear zone section, a wall post-shear expanded zone section, and a wall post-shear contracted zone section; and
a pressure application device, wherein the pressure application device applies pressure to the material to force the material to contact the expanding shear material section to provide an expanded post-shear material section, and wherein pressure from the pressure application device applies pressure to the material to force the expanded post-shear material section to contact the contracting shear material section to provide a contracted shear material section.
2. The equal channel angular extrusion system of claim 1 , wherein the expanding shear material section comprises a first shear expansion zone and a second shear expansion zone.
3. The equal channel angular extrusion system of claim 1 , wherein the expanding shear material section comprises an expanding angle and a second expanding angle.
4. The equal channel angular extrusion system of claim 1 , wherein the contracting shear material section comprises a first shear contraction zone and a second shear contraction zone.
5. The equal channel angular extrusion system of claim 1 , wherein the contracting shear material section comprises a contracting angle and a second contracting angle.
6. The equal channel angular extrusion system of claim 1 , wherein the portion of the interior mandrel comprises an interior mandrel pre-shear zone section.
7. The equal channel angular extrusion system of claim 6 , wherein the interior mandrel further comprises an interior mandrel post-shear expanded zone section disposed between the expanding shear material section and the contracting shear material section.
8. The equal channel angular extrusion system of claim 7 , wherein the interior mandrel further comprises an interior mandrel post-shear contracted zone section, and wherein the contracting shear material section is disposed between the interior mandrel post-shear contracted zone section and the interior mandrel post-shear expanded zone section.
9. The equal channel angular extrusion system of claim 8 , wherein the interior mandrel post-shear contracted zone section has about the same diameter as the interior mandrel pre-shear zone section.
10. The equal channel angular extrusion system of claim 1 , wherein the wall moves in parallel with the material.
11. The equal channel angular extrusion system of claim 1 , wherein the material comprises a lubricant.
12. The equal channel angular extrusion system of claim 1 , wherein the material is heated prior to being disposed about the portion of the interior mandrel.
13. The equal channel angular extrusion system of claim 1 , wherein the pressure application device continues to apply pressure until substantially all of the material comprises the contracted shear material section.
14. The equal channel angular extrusion system of claim 1 , wherein the contracted shear material section comprises a substantially uniform micro-structure.
15. A method for applying severe plastic deformation to a material to provide the material with substantially uniform micro-structure, comprises:
(A) disposing the material between a portion of an interior mandrel that slides with the material and a portion of a wall that slides with the material, wherein the wall contacts an entire circumference of the material disposed within a wall pre-shear zone section, a wall post-shear expanded zone section, and a wall post-shear contracted zone section;
(B) expanding the material to provide an expanded post-shear material section;
(C) contracting the expanded post-shear material section to provide a contracted shear material section, wherein the contracted shear material section comprises substantially uniform micro-structure.
16. The method of claim 15 , wherein the expanding comprises contacting the material with an expanding shear material section.
17. The method of claim 15 , wherein the contracting comprises contacting the material with a contracting shear material section.