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通过晶体塑性有限元与电子背散射衍射(EBSD)技术相结合的方法,实现TA15钛合金相变点以上高温压缩变形的晶体塑性有限元模拟。采用元胞自动机方法获得了晶粒的初始形貌,通过用户子程序UMAT将基于率相关晶体塑性本构方程嵌入到软件ABAQUS中。模拟结果显示,TA15合金热压缩变形组织呈明显的形变不均匀特征,模型中晶粒内部应力应变分布不均匀。不同晶粒滑移系的开动不同,即使在同一晶粒内部,也存在滑移系开动不同步的情况。采用电子背散射衍射(EBSD)技术对TA15钛合金的热压缩变形组织的变形不均匀特征进行了验证。
Through the combination of crystal plastic finite element and electron backscatter diffraction (EBSD) technique, the crystal plastic FEM simulation of high temperature compression deformation above the transformation temperature of TA15 titanium alloy was realized. The initial morphology of the grains was obtained by using the cellular automata method. The software-based ABAQUS was embedded into the mass-dependent constitutive equations based on the rate-dependent crystals through the user subroutine UMAT. The simulation results show that the hot deformation of TA15 alloy shows obvious deformation and nonuniformity, and the distribution of internal stress and strain in the model is not uniform. Different grain slip system of different start, even within the same grain, there are also slip system start unsynchronized situation. The electron beam backscatter diffraction (EBSD) technique was used to verify the characteristics of non-uniform deformation of TA15 titanium alloy under hot compression deformation.