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基于TC4钛合金压缩变形时的微观组织观察和定量金相实验,研究了变形工艺参数(变形温度、应变速率和变形程度)对微观组织演变和组织参数(初生α相晶粒尺寸和体积分数)的影响。结果表明:在α+β两相区,随着变形温度的升高,初生α相晶粒尺寸呈波浪状变化,初生α相逐渐减少;随着应变速率的增加,初生α相形貌由等轴状转变为长条状,微观组织参数的变化规律与温度有关,当变形温度高于1203K时,初生α相晶粒尺寸逐渐减小,而低于1203K时,初生α相晶粒尺寸呈波浪状变化。当变形温度高于1223K时,初生α相体积分数呈波浪状变化,而低于1223K时,初生α相体积分数逐渐减小;随着变形程度的增加,二次α相逐渐减少,初生α相晶粒尺寸呈先减小后略有增大的趋势,而初生α相体积分数变化较小。
Based on the microstructure observation and quantitative metallographic examination of TC4 titanium alloy under compressive deformation, the effects of deformation parameters (deformation temperature, strain rate and deformation degree) on microstructure evolution and microstructure parameters (primary α-phase grain size and volume fraction) Impact. The results show that in the α + β two-phase region, the grain size of the primary α-phase changes wavy and the primary α-phase decreases with the increase of the deformation temperature. With the increase of the strain rate, The change of the microstructure parameters is related to the temperature. When the deformation temperature is higher than 1203K, the grain size of the primary α phase decreases gradually. When the grain size is lower than 1203K, the grain size of the primary α phase is wavy Change. When the deformation temperature is higher than 1223K, the volume fraction of primary α-phase changes wavy. When the temperature is lower than 1223K, the volume fraction of primary α phase decreases gradually. With the increase of deformation degree, the secondary α phase decreases gradually. The grain size decreases first and then increases slightly, while the volume fraction of primary α phase changes little.