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建立钛合金等温局部加载三态组织预测模型,以实现三态组织参数与性能的定量调控。逐工步的TA15钛合金等温局部加载实验表明,三态组织形成中存在4个重要组织演化现象:条状α相的生成、各组成相含量变化、条状α相取向变化及条状α相的球化。基于实验结果,总结了工艺条件对上述4种组织演化现象的定量影响规律,在此基础上建立了联系三态组织参数(等轴α相含量、条状α相含量、条状α相取向分布混乱度指数、条状α相的球化分数)与成形条件的三态组织预测模型。然后,将组织模型嵌入有限元模拟软件,建立了基于有限元的等温局部加载三态组织预测模型。通过实验组织观测验证了模型的可靠性与准确性,说明本文作者建立的三态组织模型及其与有限元模型的集成可以有效地预测TA15钛合金等温局部加载三态组织参数。
The isothermal three-state microstructure prediction model of titanium alloy is established to realize the quantitative regulation of the three-state microstructure parameters and properties. The step-by-step TA15 titanium alloy isothermal partial loading experiments show that there are four important organizational evolution in the three-state microstructure evolution: the formation of the strip α phase, the change of the composition of the phase composition, the strip α-phase orientation change and the strip α phase Of the ball. Based on the experimental results, the quantitative rules of the above four kinds of microstructural evolution phenomena were summarized. Based on these results, the relationship between the three-state microstructure parameters (equiaxial α phase content, α-phase bar content, Chaos index, spheroidal fraction of bar α phase) and the forming conditions of the three-state tissue prediction model. Then, the tissue model is embedded into the finite element simulation software, and a three-state isothermal model of isothermal loading is established based on the finite element method. The experimental results verify the reliability and accuracy of the model. It is shown that the three-state model established by the author and its integration with the finite element model can effectively predict the isothermal partial loading of the tri-state tissue parameters of the TA15 titanium alloy.