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摘要
The compression deformation behaviors of AZ31B thick plate at different deformation temperatures of 200-520 ℃and high strain rates of 2-60 s-1were studied by using Thermecmastor-Z hot simulation equipment with a strain of 60%. The influence of deformation temperature and strain rate on the microstructure evolution based on the microstructures after deformation and true stress-true stain curve after hot compression was investigated. The results show that true stress-true strain curve is a normal shape for hot working with dynamic recrystallization when deformation temperature is higher than 320 ℃. And the flow stress decreases with increasing temperature at a given strain rate, while it increases with increasing strain rate at a given temperature and a strain rate lower than 15 s-1. The microstructure observation also suggests that dynamic recrystallization takes place obviously during the deformation process. The volume fraction of dynamic recrystallization grains increases with increasing strain rate. In addition, distinct distribution of gains exists in the samples deformed at various temperatures. Based on the hot compression experiment results, AZ31B rolling sheet was processed at 300-330 ℃and at large reduction per pass. The obtained AZ31B sheet shows fine grain size and excellent mechanical properties.
- 出版日期2014
- 单位上海交通大学
