TC21钛合金动态再结晶行为的元胞自动机模拟  

Cellular Automata Simulation of Dynamic Recrystallization Behavior of TC21Titanium Alloy

作　　者：孙越 孙勇 杨勇 袁超 凌云汉 Sun Yue;Sun Yong;Yang Yong;Yuan Chao;Ling Yunhan(Beijing Research Institute of Mechanical&Electrical Technology Co.,Ltd,CAM,Beijing 100083,China)

机构地区：[1]中国机械总院集团北京机电研究所有限公司,北京100083

出　　处：《稀有金属材料与工程》2023年第9期3139-3146,共8页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2022YFB3706904)。

摘　　要：为研究热加工工艺不同变形参数对TC21钛合金塑性成形过程中微观组织的影响,利用Gleeble-3500型热模拟试验机进行等温恒应变速率热压试验,研究了TC21钛合金在不同变形条件下的热变形行为;并以TC21钛合金在热压缩过程中微观组织演变为基础,通过对TC21钛合金的位错密度模型、再结晶形核和晶粒长大模型的推导,建立了元胞自动机模型,并基于元胞自动机模型对TC21钛合金β单相区变形过程中的动态再结晶行为进行了模拟和验证。结果表明:该合金的流变应力随着温度的降低和应变速率的升高而增大;结合元胞自动机模拟结果分析得,在β单相区内该合金动态再结晶体积分数与变形温度成正比,而与应变速率成反比。In order to study the effect of different deformation parameters of thermal processing on the microstructure of TC21titanium alloy during plastic forming,isothermal constant strain rate thermal compression experiments were performedonthethermal simulation testing machine,and the thermal deformation behavior of TC21 titanium alloy under different deformationconditions was studied.Based on the microstructure evolution of TC21 titanium alloy during thermal compression,a cellularautomata was established by the derivation of dislocation density model,recrystallization nucleation and grain growth model ofTC21 titanium alloy.Based on the cellular automaton model,the dynamic recrystallization behavior TC21 titaniumalloyduringdeformation in theβsingle-phase region was simulated and verified.The results show that the flow stress of the alloy increaseswith the decrease in temperature and the increase in strain rate;according to the analysis of cellular automata simulationresults,the dynamic recrystallization volume fraction of the alloy is positively proportional to the deformtion temperature and inverselyproportional to the strain rate.

关 键 词：TC21钛合金 热变形 元胞自动机模型 动态再结晶 晶粒尺寸模型 

分 类 号：TG146.23[一般工业技术—材料科学与工程]