摘要
The globularization behavior and mechanism of TC17 alloy with basketweave microstructure were investigated, and the models of dynamic and static globularization kinetics were established. The quantitative and metallographic results show that the globularization of α phase is sensitive to the parameters of deformation and heat treatment. By EBSD analysis, the formation and evolution mechanisms of intra-α boundaries are related to discontinuous dynamic recrystallization and continuous dynamic recrystallization, which can form α grains with high and low misorientations between neighbour grains after the heat treatment, respectively. Based on the globularization behavior and mechanism, two modified JMAK models are developed to predict the dynamic and static globularization kinetics, and the mean absolute relative errors(MARE) of 10.67% and 13.80% indicate the accuracy of the dynamic and static globularization kinetics models. The results of this work can provide guidance for controlling microstructure of titanium alloy.
研究具有网篮组织TC17合金的球化行为和机理,建立动态和静态球化的动力学模型。定量和金相结果表明:α相的球化对变形和热处理工艺参数十分敏感。通过EBSD分析,α内晶界的形成和演化机制与不连续动态再结晶和连续动态再结晶两种机制有关,并在热处理后分别形成和相邻晶粒取向差大和取向差小的两种α晶粒。基于球化行为和机理,建立两种修正JAMK模型,分别用于预测动态和静态球化动力学。10.67%和13.80%的平均相对误差绝对值(MARE)表明动态和静态球化动力学模型的准确性。研究结果可以为钛合金的显微组织调控提供指导。
基金
the support from the Science Fund for Distinguished Young Scholars from Shaanxi Province, China (No. 2020JC-17)
the National Natural Science Foundation of China (No. 51705425)
the Research Fund of the State Key Laboratory of Solidification Processing (NWPU), China (No. 2019-QZ-04)
the Fundamental Research Funds for the Central Universities, China (No. 3102019PY007)。
