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摘要
The deformation of equal channel angular warm extrusion of AZ31 magnesium alloy was studied combining finite element simulation and experimental study. The optimized die geometries and reasonable process parameters were further obtained. The results show that during the extrusion process, the extrusion workpieces can be squeezed out smoothly and the service life of die is improved by reducing the friction properly and selecting the extrusion temperature as about 250 ℃. The design method of critical parts such as punch and prestress combined die was given, and the multi-pass equal cross section channel angular warm extrusion experiment was conducted. The evolution laws of grain evolution of round-workpieces were obtained by analysis from the aspects of macro deformation and microstructure. The analysis results show that the deformation uniformity of workpiece is affected by the processing route. Uniform microstructure distribution can be obtained by using route Bc and route C after four passes equal channel argular warm extrusion. During the extrusion process, the grain of extrusion workpiece is gradually refined and the grain boundary distribution tends to be equiaxial. ? 2021, Editorial Board of Journal of Plasticity Engineering. All right reserved.
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