Magnesium Sheet Metal production today

Transcription

1 Magnesium Metal production today Production of Magnesium Metal through rolling or strip casting Advantages High productivity Good quality / reproducibility Large sheet width Disadvantages High invest High pricing Inflexible Only standard material available Inhomogeneous properties Seite Slide 1

2 Extrusion of magnesium sheet metal Grittner N. 1, Engelhardt M. 1, Breidenstein B. 3, Behrens, B.A. 2, Bach Fr.-W. 1 1 Leibniz Universität Hannover, Institut für Werkstoffkunde 2 Leibniz Universität Hannover, Institut für Umformtechnik und Umformmaschinen 3 Leibniz Universität Hannover, Institut für Fertigungstechnik und Werkzeugmaschinen Dipl.-Ing (FH) Marcus Engelhardt MSc Institut für Werkstoffkunde An der Universität 2 D Garbsen Tel.: (++49) 0511 / FAX: (++49) 0511 / engelhardt@iw.uni-hannover.de 27/04/2012

3 Table of Contents Application Technical equipment Extrusion process Extrusion trials Results Conclusion / Future work Seite Slide 3

4 Application Base material: Process: Product: Roll forming machine at the Institute of Materials Science Roll formed AZ31 tube, Ø 20 mm x 0.5 mm Extruded AZ31 sheet, with the dimension of 61.1 mm x 0.5 mm Abrasive waterjet cutting Meander structure for biomedical application (supporting tissue) LA63 Seite Slide 4

5 Technical Equipment 10MN Extrusion Press (SMS MEER) Container-Ø: 125 mm 146 mm Billet length max.: direct: 300 mm indirect: 260 mm Ram speed : 0.2 mm/s - 30 mm/s Puller (force controlled): F max = 1000 N run-out table length 12 m Seite Slide 5

6 Extrusion trials / process Extrusion parameters dimension [mm x mm] Extrusion ratio Die geometrie T Container [ C] T Die [ C] T Billet [ C] V Ram [mm/s] 80 x S / R / / x R / / 2.0 S: Sharp edge R: Radius Direkt extrusion process Sharp edge (S) Radius (R) billet die billet die Seite Slide 6

7 Extrusion Force in in MN MN Extrusion Force in in MN MN Results: Extrusion Force C 0,5 S Sharp 350 edge: C 0,5 S 350 C 0,5 T =350 C Billet 390 C 0,5 Sv R Ram =0.5mm/s Sharp edge: T Billet =390 C v Ram =0.5mm/s Time in s Time in Radius: 350 C 0,5 S Sharp 350 edge: C 0,5 T S Billet =350 C 350 C 0,5 350 C 0,5 v R Ram R =0.5mm/s T Billet =350 C v Ram =0.5mm/s Time in s Time in Maximum Extrusion Force die geometry Billet temperature ram velocity 0.5 mm/s 2.0 mm/s sharp edge 350 C 9.20 MN 9.13 MN 390 C 7.90 MN 8.30 MN radius 350 C 8.30 MN 8.5 MN 390 C 7.70 MN 7.70 MN Seite Slide 7

8 Results: Microstructure Sharp edge Radius Longitudinal specimen, v ext. =2.31 m/min, T B =350 C Longitudinal specimen, v ext =2.31 m/min, T B =350 C Longitudinal specimen, v ext. =2.31 m/min, T B =390 C Longitudinal specimen, v ext =2.31 m/min, T B =390 C Seite Slide 8

9 Results: Microstructure Sharp edge Radius Longitudinal specimen, v ext. =9.24 m/min, B =350 C Longitudinal specimen v ext =9.24 m/min, T B =350 C Longitudinal specimen, v ext. =9.24m/min, T B =390 C Longitudinal specimen, v ext =9.24m/min, T B =390 C Seite Slide 9

10 Results: Microstructure Sharp edge shear bands Longitudinal specimen, v ext. =9.24 m/min, B =350 C Longitudinal AZ31 rolled specimen. Heat treatment: 2h at 340 C Longitudinal specimen, v ext. =9.24m/min, T B =390 C Seite Slide 10

11 Yield stress Rp 0,2 [MPa] Yield stress Rp 0,2 [MPa] Results: Mechanical Properties 2 mm Sharp edge Radius Tensile test according to DIN Seite Slide 11

12 Tensile strenth Rm [MPa] Tensile strenth Rm [MPa] Results: Mechanical Properties 2 mm Sharp edge Radius Tensile test according to DIN Seite Slide 12

13 Ultimate strain A [%] Ultimate strain A [%] Results: Mechanical Properties 2 mm Sharp edge Radius Tensile test according to DIN Seite Slide 13

14 Ultimate strain A [%] Ultimate strain A [%] Results: Mechanical Properties 2 mm Sharp edge Radius Tensile test according to DIN Seite Slide 14

15 Yield stress Rp 0,2 [MPa] Yield stress Rp 0,2 [MPa] Results: Mechanical Properties 2 mm compared with 1mm Radius 2mm Radius 1mm Tensile test according to DIN Seite Slide 15

16 Yield stress Rp 0,2 [MPa] Yield stress Rp 0,2 [MPa] Results: Mechanical Properties 2 mm compared with 1mm Sharp edge 2mm Radius 1mm Tensile test according to DIN Seite Slide 16

17 Conclusions / Future work Conclusions AZ31 magnesium sheets with a wideness of 80 mm and a thickness of 1 and 2 mm were manufactured by using the direct extrusion process The sheets shows a bimodal, dynamically recrystallized microstructure The mechanical properties can be adjusted by changing the process parameters The mechanical anisotropy in the yield stress and ultimate tensile strength is reduced by decreasing the process temperature The influence of the tool geometry were only observed at yield stress Future Work Influence of heat treatment, quenching of the profile with different types of media e.g. air/water-spray cooling and combination of extrusion and rolling on the mechanical properties and texture Seite Slide 17

18 Metal Extrusion The better way for magnesium sheet metal production??? Seite Slide 18

19 Metal Extrusion The flexible way for magnesium sheet metal production! Seite Slide 19