Past, present, and future developments of tungsten 25% rhenium tool material for friction stir welding of steel and hard metals
- Leonhardt T. and
- Thompson B.
- Leonhardt T. and
- Thompson B.
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A review is presented of the development of W, 25%Re friction stir welding (FSW) tool materials for application to steels and hard metals, such as titanium and nickel-based superalloys. Issues discussed include: the DUST (dual use science and technology) programme involving FSW of HSLA-65 steels for marine applications; microstructure and porosity of W, 25%Re rods; shock hole testing of HSLA-65 discs; hot isostatic pressing and hot extrusion of W, 25%Re rods; pin and "Tri-flute" tools; the effect of HfC addition on the microstructure and mechanical properties of the tool materials; high temperature sintering, high pressure cold isostatic pressing and four die rotary swaging of W, 25%Re alloys; variable penetration tool design; thermomechanical modelling of tool deformation; diffusion models of tool wear; and extrusion and forging capabilities to produce large diameter FSW refractory metal rods and FSW tools with customised mechanical properties.
9th International Symposium, 15-17 May 2012, Session 3B: FSW Tools, Paper 02
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