Combining the processing maps with FEA,the critical values of reduction of diameter(ΔR) for the appearance of as-cast microstructure,dynamic recrystallization grains and twins in the swaged magnesium were respectivel...Combining the processing maps with FEA,the critical values of reduction of diameter(ΔR) for the appearance of as-cast microstructure,dynamic recrystallization grains and twins in the swaged magnesium were respectively studied,by which the rational range ofΔR was obtained.To ensure that the as-cast microstructure wouldn't be retained in the rotary-swaged magnesium,ΔR should be larger than 0.25 mm.To avoid the appearance of twins in the microstructure of rotary-swaged magnesium,ΔR should be less than 1.0 mm.ΔR should be between 0.25 mm and 1.0 mm to ensure the appearance of recrystallized grains.The surface roughness of rotary-swaged magnesium increases with the increase ofΔR by quadratic function.The simulated results accord well with the experimental data.In the process control of rotary-swaging(RS),ΔR should be maximized between 0.25 mm and 1.0 mm on the precondition that the requests for surface roughness have been satisfied.展开更多
基金Project(2007CB613706)supported by the National Basic Research Program of ChinaProject(52009999200702)supported by theInitiating Fund of Doctors'Research of Beijing University of Technology.China
文摘Combining the processing maps with FEA,the critical values of reduction of diameter(ΔR) for the appearance of as-cast microstructure,dynamic recrystallization grains and twins in the swaged magnesium were respectively studied,by which the rational range ofΔR was obtained.To ensure that the as-cast microstructure wouldn't be retained in the rotary-swaged magnesium,ΔR should be larger than 0.25 mm.To avoid the appearance of twins in the microstructure of rotary-swaged magnesium,ΔR should be less than 1.0 mm.ΔR should be between 0.25 mm and 1.0 mm to ensure the appearance of recrystallized grains.The surface roughness of rotary-swaged magnesium increases with the increase ofΔR by quadratic function.The simulated results accord well with the experimental data.In the process control of rotary-swaging(RS),ΔR should be maximized between 0.25 mm and 1.0 mm on the precondition that the requests for surface roughness have been satisfied.
