| The effect of different deformation temperature, different deformation degree and different deformation rate on the recrystallized degree and grain size of copper tee joint valve body after Multidirectional extrusion deformation were Investigated. The results shows that the recrystallization structure is Homogeneous and fine (stick or needle shape) after Multidirectional active loading by half closed mould cavity at more than 720 °C and higher deformation rate (1~5s-1) when average deformation degree is above 50%. Through choose reasonable accurate processing routing, multidimensional active loading can make each deformation zone deformed simultaneously, which could significantly reduce the non-uniform deformation. Compared to the ordinary extrusion process, deformation dead zone obviously decreased and the microstructure of workpiece is more homogeneous and the deformation force is decreased greatly. |
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