细晶TC4钛合金的动态再结晶行为及数值模拟  

Dynamic Recrystallization Behavior and Numerical Simulation of Fine Grain TC4 Titanium Alloy

作　　者：刘莹莹[1] 李嘉懿 郭文虎 张君彦 翟江波 Liu Yingying;Li Jiayi;Guo Wenhu;Zhang Junyan;Zhai Jiangbo(School of Metallurgical Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;Shaanxi Hong Yuan Aviation Forging Company Ltd,Xianyang 713800,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]陕西宏远航空锻造有限责任公司,陕西咸阳713800

出　　处：《稀有金属材料与工程》2022年第11期4137-4145,共9页Rare Metal Materials and Engineering

基　　金：陕西省重点研发计划国际合作项目(2020KW-033);陕西省教育厅产业化项目(20JC024);西安市科技计划项目(21XJZZ0035)。

摘　　要：采用实验和有限元模拟相结合的方法,研究了经连续变断面循环挤压制备的细晶TC4钛合金热加工过程中的动态再结晶(DRX)行为。通过实验得到的真应力-真应变曲线,建立了细晶TC4钛合金的临界应变模型和DRX动力学模型,并基于所建立的DRX模型,采用DEFORM-3D软件对其热压缩过程进行了模拟。结果表明:热压缩工艺参数对细晶TC4合金的DRX行为有显著影响;随着变形温度的升高和应变速率的降低,动态再结晶的体积分数(XDRX)及其晶粒尺寸均增大;随着应变的增大,变形区的等效应变和区域范围均增大;合金变形时,XDRX的实验值与其模拟值的相关性为0.9762,表明所建立的模型具有较高的精度。The dynamic recrystallization(DRX)behavior of fine-grain TC4 titanium alloy prepared by continuous variable cross-section recycled extrusion during hot working was investigated by combining experiment and finite element simulation.The critical strain and DRX dynamic models of fine-grain TC4 titanium alloy were established based on the true stress-strain curves obtained by the experiment.The material properties were defined based on the DRX models,and the thermal compression process was simulated by DEFORM-3D software.The results show that the DRX behavior of fine grain TC4 is significantly affected by thermal compression process ing parameters.The volume fraction of dynamic recrystallization(XDRX)and the grain size are increased with increasing deformation temperature and decreasing strain rate.The equivalent strain and range of the deformation zone are increased simultaneously with increasing strain.The correlation between the experimental value and the simulated value of XDRX is 0.9762,which indicates the high accuracy of the established model.

关 键 词：连续变断面循环挤压 细晶TC4钛合金 有限元模拟 临界应变模型 动态再结晶模型 

分 类 号：TG146.23[一般工业技术—材料科学与工程]