ZrTiAlV合金锻造过程中变形与组织演化规律

发布时间：2018-02-26 15:48

本文关键词： ZrTAlVi合金热压缩实验本构模型微观组织演变模型 Deform-3D　出处：《燕山大学》2016年硕士论文　论文类型：学位论文

【摘要】：ZrTiAlV合金是一种同时具有钛合金和锆合金优点的新型合金,因此ZrTiAlV合金可以作为航天结构材料和核工业材料的构件使用,其锻件的主要成形方法为热锻,而锻造工艺参数在很大程度上会对ZrTiAlV合金件的性能及组织产生影响。所以,通过实验手段建立ZrTiAlV合金的本构方程及微观组织演变模型,并结合Deform-3D有限元分析软件对ZrTiAlV合金锻件热成形过程进行模拟,预测其微观组织分布,从而更好的指导实际生产。本文利用Gleeble-3800热模拟实验机对ZrTiAlV合金进行热压缩实验,得到了其在不同变形条件下的应力应变曲线,并对各变形条件对其应力的影响规律进行分析。再通过对实验数据的拟合,建立ZrTiAlV合金热变形性能参数与Z参数的函数关系,并以Arrhenius双曲正弦方程为基础,建立了适用于ZrTiAlV合金热变形过程的本构模型。通过对压缩完成后的样品进行金相制备及数据统计分析,得到了各变形参数对ZrTiAlV合金热变形过程中的平均晶粒度、再结晶晶粒度、再结晶体积分数等的影响规律,基于统计数据建立了ZrTiAlV合金热锻过程中的动态再结晶模型、亚动态再结晶模型及静态再结晶模型。将建立的热变形本构模型及微观组织演变模型导入Deform-3D软件对涡轮盘锻件的成形过程进行模拟。根据模拟结果,分析了锻件的成形情况及应力应变等的变化规律,并对其平均晶粒度、再结晶晶粒度、再结晶体积分数等微观组织演变参量进行了预测。
[Abstract]:ZrTiAlV alloy is a new kind of alloy which has the advantages of both titanium alloy and zirconium alloy. Therefore, ZrTiAlV alloy can be used as a component of spaceflight structure materials and nuclear industrial materials. The main forming method of its forgings is hot forging. The forging process parameters have a great influence on the properties and microstructure of ZrTiAlV alloy. Therefore, the constitutive equation and microstructure evolution model of ZrTiAlV alloy are established by means of experiments. The hot forming process of ZrTiAlV alloy forgings is simulated with Deform-3D finite element analysis software, and the microstructure distribution is predicted, which can better guide the actual production. In this paper, the thermal compression experiment of ZrTiAlV alloy is carried out by using Gleeble-3800 thermal simulation machine. The stress-strain curves of ZrTiAlV alloy under different deformation conditions are obtained, and the influence of each deformation condition on its stress is analyzed. By fitting the experimental data, the functional relationship between the thermal deformation performance parameters and Z parameters of ZrTiAlV alloy is established. Based on the Arrhenius hyperbolic sinusoidal equation, a constitutive model suitable for hot deformation of ZrTiAlV alloy was established. The effects of deformation parameters on the average grain size, recrystallization grain size and the integral number of recrystallized volume of ZrTiAlV alloy during hot deformation were obtained. Based on the statistical data, the dynamic recrystallization model of ZrTiAlV alloy during hot forging was established. Subdynamic recrystallization model and static recrystallization model. The thermal deformation constitutive model and microstructure evolution model were imported into Deform-3D software to simulate the forming process of turbine disk forgings. The forming conditions of forgings and the variation of stress and strain were analyzed, and the microstructure evolution parameters such as average grain size, recrystallization grain size and integral number of recrystallized volume were predicted.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG319

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