Ti6554钛合金高温变形行为与微观组织演化机制研究  

Investigation on Hot Deformation Behavior and Microstructural Evolution of Ti6554 Titanium alloy

作　　者：武川 刘斌[1] 周宇杰 徐广胜 WU Chuan;LIU Bin;ZHOU Yu-jie;XU Guang-sheng(National and Local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die&Mold,Tianjin University of Technology and Education,Tianjin 300222,China;School of Material Engineering,Shaanxi Polytechnic Institute,Xianyang 712000,China)

机构地区：[1]天津职业技术师范大学汽车模具智能制造国家地方联合工程实验室,天津300222 [2]陕西工业职业技术学院材料工程学院,陕西咸阳712000

出　　处：《精密成形工程》2022年第1期114-125,共12页Journal of Netshape Forming Engineering

基　　金：国家自然科学基金面上项目(52075386,52074193);中国博士后科学基金面上项目(2020M672309);陕西省高性能精确成形技术与装备重点实验室开放课题(PETE2019KF02)。

摘　　要：目的揭示新型高强韧钛合金Ti-6Cr-5Mo-5V-4Al(Ti6554)在710~910℃和0.001~10 s^(-1)条件下的热变形行为、热加工图和微观组织演化机制。方法基于Gleeble-3800D热模拟试验和金相观察,基于实测数据拟合Arrhenius型全应变本构模型。结果建立了本构模型σ=0.0045ln{(Z/4.66×4.66×10^(12))^(1/3.76)+[(Z/4.66×10^(12))^(2/3.76)+1]^(1/2)};建立了应变为0.1~0.9的热加工图;Ti6554钛合金在温度高于850℃、应变速率低于0.1 s^(-1)和应变大于0.6的条件下,会发生明显的动态再结晶现象。结论预测流动应力值与实验值的最大误差为10%,为制定Ti6554钛合金锻件热加工工艺提供了理论依据。The work aims to reveal the hot deformation behaviors,hot working map and microstructural evolution of high-strength ductility titanium alloy Ti-6Cr-5Mo-5V-4Al(Ti6554) under conditions of 710-910℃ and 0.001-10 s^(-1).Through Gleeble-3800 D hot modeling test and metallographic observation,the Arrhenius full-strain constitutive model was fitted based on measured data.The constitutive model(σ=0.0045ln{(Z/4.66×4.66×10^(12))^(1/3.76)+[(Z/4.66×10^(12))^(2/3.76)+1]^(1/2)}) was established and the working maps at strain values from 0.1 to 0.9 were prepared.When the temperature was higher than 850℃,the strain rate was lower than 0.1 s^(-1)and the strain was greater than 0.6,the obvious dynamic recrystallization occurred in Ti6554 titanium alloy.The largest relative error between the predicted value and the measured value is 10%,which provides a theoretical basis for developing the hot working process of the Ti6554 titanium alloy.

关 键 词：Ti6554高强韧钛合金 本构方程 热加工图 动态再结晶 

分 类 号：TG146.23[一般工业技术—材料科学与工程]