Manufacture of Magnesium Tubes with Gradient Hardness Distribution Using a Two-Stage Porthole Extrusion Die

Yeong Maw Hwang; Yu Chen; Sergei Alexandrov

doi:10.4028/www.scientific.net/KEM.716.49

Paper Titles

Benefits of Using Diamond Dies for Cold Alternate Drawing of Magnesium Alloys
p.13

Ductility Improvement of High Carbon Steel Wire by Alternate Wire Drawing
p.22

Improvement of Ductility with Maintaining Strength of Drawn High Carbon Steel Wire
p.32

Influence of Process Parameters on the Product Integrity in Friction Stir Extrusion of Magnesium Alloys
p.39

Manufacture of Magnesium Tubes with Gradient Hardness Distribution Using a Two-Stage Porthole Extrusion Die
p.49

Numerical Optimization and Practical Implementation of the Tube Extrusion Process of Mg Alloys with Micromechanical Analysis of the Final Product
p.55

Study on Wire Rod Drawing Process Using the Rotating Die
p.63

The Effect of Equivalent Strain on Punch Load for Cold Backward Extrusion of Copper Cans
p.68

The High Speed Wire Drawing Process of Steel Wires under Fluid Frictions Conditions
p.76

HomeKey Engineering MaterialsKey Engineering Materials Vol. 716Manufacture of Magnesium Tubes with Gradient...

Manufacture of Magnesium Tubes with Gradient Hardness Distribution Using a Two-Stage Porthole Extrusion Die

Abstract:

This paper aims to manufacture magnesium alloy tubes with gradient hardness using hot extrusion process. A two-stage porthole die together with a mandrel is designed to have a straight channel part combined with a conical part. Materials are pushed through this specially-designed die cavity to generate a non-uniform velocity distribution at cross sections between the mandrel and the die and result in different strain and strain rate distributions. Accordingly, a gradient microstructure or hardness product can be obtained. Using the finite element analysis, the effective strain distributions inside the die cavity and at the die exit are firstly discussed for various inclination angles in the conical part of the mandrel. Then, hot extrusion experiments with a two stage porthole die set are conducted to obtain magnesium alloy products with gradient microstructures and hardness. Using a die set of mandrel inclination angle of 10^o and die inclination angle of 25^o, gradient microstructures of grain sizes of 4.30μm, 5.92 μm and 3.67μm at the outer surface, center zone, and inner surface, respectively, are achieved.

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Periodical:

Key Engineering Materials (Volume 716)

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49-54

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.716.49

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Online since:

October 2016

Authors:

Yeong Maw Hwang*, Yu Chen, Sergei Alexandrov

Keywords:

Finite Element Analysis, Gradient Microstructure, Hot Extrusion, Two-Stage Porthole Die Set

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References

[1] T. Aukrust, S. LaZghab, Thin shear boundary layers in flow of hot aluminium, Int. J. Plast. 16 (2000) 59-71.

DOI: 10.1016/s0749-6419(99)00047-9

Google Scholar

[2] S.P. Moylan, S. Kompella, S. Chandrasekar, T.N. Farris, A new approach for studying mechanical properties of thin surface layers affected by manufacturing processes, Trans. ASME. J. Manuf. Sci. Eng. 125 (2003) 310-315.

DOI: 10.1115/1.1559161

Google Scholar

[3] H. Tadashi, Current trends of implant produce development in orthopedics, J. Jap. Soc. Tech. Plastic. 51 (2010) 177-181.

Google Scholar

[4] L. Ma, X.D. He, Z.H. Hu, Y. Sun, Optimum design, microstructure and mechanical properties of Ti/Ti3Al multi-layered materials, Mater. Sci. Forum. 546-549 (2007) 1575-1580.

DOI: 10.4028/www.scientific.net/msf.546-549.1575

Google Scholar

[5] Y. Chen, Q. Wang, J. Peng, C. Zhai, W. Ding, Effects of extrusion ratio on the microstructure and mechanical properties of AZ31 Mg alloy, J. Mater. Proc. Tech. 182 (2007) 247-267.

DOI: 10.1016/j.jmatprotec.2006.08.012

Google Scholar

[6] T. Murai, S. Matsuoka, S. Miyamoto, Y. Oki, Effects of extrusion conditions on microstructure and mechanical properties of AZ31B magnesium alloy extrusions, J. Mater. Proc. Tech. 141 (2003) 207-212.

DOI: 10.1016/s0924-0136(02)01106-8

Google Scholar