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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Refractory Metals 2016
Presentation Title Mechanical Properties of Cold-rolled Tungsten at Different Strain Rates
Author(s) Qiuming Wei, Laszlo J. Kecskes
On-Site Speaker (Planned) Qiuming Wei
Abstract Scope In this work, commercial purity tungsten was rolled at different temperatures with different reductions. To avoid cracking and oxidation during rolling, the tungsten piece was confined and sealed within a stainless steel tube. The rolling temperature started at 850 Celsius and the lowest rolling temperature was 450 Celsius. After rolling, specimens for tension and high strain rate compression were machined from the rolled tungsten for mechanical testing at different strain rates. It was found that cold rolling significantly reinstates the tensile ductility of tungsten. The strength and tensile ductility of tungsten both increase with decrease in rolling temperature. Fractography of the tensile specimens suggests laminated structure of the rolled tungsten and severe plastic deformation during tension. Under high strain rate loading using a Kolsky bar system, cold-rolled tungsten specimens exhibit strong tendency to adiabatic shear localization. A mechanistic theory was used to explain the experimental results at high strain rate.
Proceedings Inclusion? Planned: A print-only volume


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