TA15钛合金热挤压过程中金属变形行为及组织分析

Metal Behavior of Hot Extrusion Deformation and Microstructural Analysis of TA15 Titanium Alloy

摘要:

运用MSC.Marc有限元软件对TA15钛合金热挤压变形过程进行有限元模拟，得到热挤压成形过程中应力场和应变场分布情况。对有限元模拟所得到的应力、应变数据进行后处理，利用应力偏量不变量J2进行变形分区，采用罗德系数对塑性区内材料的应变类型进行划分。结合有限元模拟结果以及变形分区和变形类型的划分，对热挤压实验后的试样进行组织取样，在不同温度条件下对试样进行微观组织观察，分析微观组织的演化规律，这对于分析金属挤压成形问题及其在实际中的应用具有重要意义。

Abstract:

The hot extrusion deformation process of TA15 titanium alloy was simulated by the FEM software MSC Marc. The distribution of equivalent stress field and the equivalent strain field was obtained. The post treatment for the data based on the simulation results including stress and strain was carried out. The division of deformation was proposed by employing the characteristic quantity such as Lode parameter and invariant of the deviator (J2). Based on the simulation results, the divisions of deformation and the divisions of the plastic deformation types, the sampling to the samples of the hot extrusion was made. Microstructure observation was carried out at different temperatures and the evolution rule of the microstructure was analyzed. It has great significance for the metal hot extrusion forming analysis and its application